Aris Talos · validation report
Generated
Most heating and cooling systems are sized from prescribed worksheets. Talos goes further: it simulates each room, its materials, windows and shading through a year of local weather. Change the design, and the model updates in seconds. Talos also runs Manual J and home energy ratings, using the rules those calculations require.
Speed is only useful if the answers hold up. We test Talos against ASHRAE Standard 140, compare physical sizing with EnergyPlus and Manual J with reference worksheets, and check energy ratings against published criteria and OpenStudio-ERI. Every result is here as measured, including where we still differ.
Talos builds a room-by-room physics model of each home: its geometry, assemblies, openings, shade, and site. Then it solves how heat moves between rooms, through walls and glass, and into the soil across all 8,760 hours of a local weather year.
Every Aris system ships with a sensor suite, so the model's predictions get checked against real homes: measured comfort and energy use, compared to what we said would happen. The gaps feed back into the physics.
Three chapters ask whether the engine is right, each catching a different kind of mistake. The first runs the whole of ASHRAE Standard 140, scoring the building's physics and the equipment bolted to it against research simulators and published analytical solutions. The second checks our Manual J calculator against published worksheets and Talos's physical sizing model against EnergyPlus on the same homes, then compares the two approaches. The third checks our whole-home score against a reference implementation. A fourth asks something else: whether the engine answers fast enough to sit inside the design loop, because a right answer that arrives after the decision fails in its own way. The fifth invites you to try that engine on your own machine and file. Each chapter says what it tests and what it leaves out.
Talos can estimate annual equipment energy from independent calendar windows. Controllers act on provisional zone demand; each accepted building and equipment step must still satisfy its physical energy balances. Comfort summaries describe control-zone temperatures. Stored temperatures and energy are not continuous across window boundaries.
Detailed sizing and prescribed rating comparisons use their own calculation contracts. Those comparisons do not establish an accuracy bound for the independent-window equipment forecast.
How closely does our physics agree with Standard 140 benchmarks?
IIDesign and sizingDo our Manual J results match the book and our physics match EnergyPlus?
IIIEnergy ratingsHow closely do our scores match the industry benchmark?
IVSpeedIs the physics fast enough to sit inside the design loop?
VRun it yourselfDo you have to take our word for any of this?
How do you check a physics engine when nobody can see inside a wall?
In the 1990s the people who write building simulators settled on a trick: define a set of imaginary buildings so precisely that anyone can model them, then have every major simulator in the world run the same ones. Nobody knows the true answer. But if your engine says the little box in Denver needs about 4 MWh of heating a year and six research simulators say 4.0 to 4.5, you're doing physics. If it says 9, you've got a bug.
That suite became ANSI/ASHRAE Standard 140; everyone still calls it BESTEST. It comes in two halves, and this chapter runs both. The fabric tests ask how heat moves through a building, changing exactly one thing per case: window direction, shade, mass, schedules, ventilation. A disagreement points straight at the piece of physics responsible. The equipment tests ask what the machine bolted to that building does with the load: how a coil degrades at part load, where the fan power goes, what happens to the moisture. Every miss prints alongside everything else.
It can't. There's no real building here, no utility bill, no sensor record. These are laboratory specimens, built to isolate physics effects that would vanish into the noise of an actual house.
Even a simple box asks a model to combine:
BSIMAC, CSE, DeST, EnergyPlus, ESP-r, and TRNSYS: decades of building-simulation research behind them. The Standard publishes what each one got, and this report plots their lowest-to-highest result for every metric. Inside means Aris landed within that spread. The midpoint is not a bullseye: the six disagree with each other too.
The verdict · Normative Annex A3, Table A3-10
Standard 140 sets no single grade. It defines five test groups, two for the building fabric and three for the equipment, each with its own list of ranges and its own pass mark at 90 percent of them. Aris clears all five: 136 of 136 ranges within limits, none outside. Passing all five is the claim a submission to the IBPSA-USA “Standard 140 Acceptance Criteria Public Software List” makes.
A range is one published interval a result has to land inside. For the fabric groups it is an annual heating or cooling load, mostly as case-to-case differences: add a west window and the load should move by roughly this much. Addendum a added a second kind, a full hourly day (February 1 or July 14) whose 24 loads have to match the Standard’s curve in both shape (Pearson correlation) and magnitude (RMSE); missing either one fails the range. For the equipment groups a range is a published bound on an annual energy, load, or coefficient of performance, mostly from the reference programs’ own spread.
The five groups carry different numbers of ranges because the Standard only sets criteria where enough of its reference programs can run the whole group. Air-side is the largest at 54; heating equipment the smallest at 6. Each pass mark is that group’s own count rounded down to 90 percent, so the five are not interchangeable and there is no sixth, combined verdict. Peak loads, free-floating temperatures, the ground-coupling suite, and the diagnostic cases carry no A3 pass mark at all; they appear further down against the informative Annex B8 spreads instead, which are usually the narrower target.
Part one · the building fabric
How heat moves through the shell: walls, windows, sun, stored heat, leaked air. No equipment yet.
Groups one and two · thermal fabric
Two buildings, one lightweight and one heavy, scored separately: 62 ranges between them. Both clear their pass mark. Every range lands inside its limits, and each one is drawn below.
BESTEST is the nickname that stuck to the NREL/IEA test suite from 1995; ASHRAE adopted it as Standard 140 in 2001. This part runs Section 7.2 of the 2023 edition (the low-mass, high-mass, free-float and in-depth cases) against the acceptance criteria in Normative Annex A3: Tables A3-1 and A3-3 for low-mass, A3-4 and A3-6 for high-mass, as amended by Addendum a (approved 2025-08-29). Addendum b (approved 2026-04-24) adds empirical-validation tests in a new Section 13 but sets no Section 7 criteria, so there is nothing from it to score here.
The two fabric groups score annual heating and cooling loads, mostly as case-to-case differences, plus the hourly February 1 and July 14 curves Addendum a added. Peak loads, free-floating temperatures, and the diagnostic cases carry no pass/fail here; they appear further down against the Annex B8 spreads instead. A3 is short on purpose: the Standard only sets criteria where enough of its reference programs can run a whole group, so the rest of the suite is left to B8 rather than left out. Those B8 spreads are usually the narrower target, partly because six programs spread less than nine, but we still have to land inside them.
One scope note: everything in this part is a building-load test. The conditioned cases use an ideal, effectively unlimited system that simply holds the setpoints, and the free-float cases remove heating and cooling entirely, so nothing here exercises a coil, a fan, a duct, or a part-load curve. The three equipment groups that do are in part two.
Every range these two groups score, one rail each: the annual loads first, then the hourly curves Addendum a added. Select a range to open its rails.
Annual heating and cooling, MWh/yr. Cases 600 and 900 are absolute; every other range is a difference between two cases, so its band can straddle zero and the rail marks where zero falls.
A lightweight room with south glass. It establishes the basic heat balance (conduction, solar gain, internal gains, thermostat control) before the suite changes one ingredient at a time.
Case 600 with a south overhang. It isolates exterior shading and asks whether the moving shadow lands where the sun actually is.
The glass moves from south to east and west. Morning and afternoon gains should arrive on time, making orientation and hourly solar geometry do the work.
East/west windows gain overhangs and side fins. It pushes compound shadow geometry without changing the lightweight room beneath it.
The heating setpoint drops overnight, then ramps back to 20°C in the morning. With unlimited ideal heat, the case exposes schedule timing and the building's peak heat demand.
A fixed mechanical ventilation flow runs overnight, heating is disabled, and ideal cooling is available only by day. The case isolates airflow, schedule timing, and the resulting sensible cooling load.
Only the window system changes. The result tests whether lower emissivity, gas fill, conductance, and solar optics stay internally consistent.
The deliberately weak window makes film coefficients, glass conductance, and solar transmission much harder to blur together.
The same lightweight room receives much stronger insulation, isolating whether envelope conductance changes by the amount the assemblies promise.
Ideal heating and cooling loads meet at the same 20°C setpoint. It exposes threshold logic and any hidden deadband assumptions.
Strong insulation and a zero-deadband thermostat combine two otherwise simple changes and reveal whether their effects compose.
One full day of 24 hourly zone loads against the Standard's printed curve, added by Addendum a. Each range is scored on shape and magnitude at once, and missing either limit fails it.
A lightweight room with south glass. It establishes the basic heat balance (conduction, solar gain, internal gains, thermostat control) before the suite changes one ingredient at a time.
A lightweight room with south glass. It establishes the basic heat balance (conduction, solar gain, internal gains, thermostat control) before the suite changes one ingredient at a time.
The heating setpoint drops overnight, then ramps back to 20°C in the morning. With unlimited ideal heat, the case exposes schedule timing and the building's peak heat demand.
Only the window system changes. The result tests whether lower emissivity, gas fill, conductance, and solar optics stay internally consistent.
Only the window system changes. The result tests whether lower emissivity, gas fill, conductance, and solar optics stay internally consistent.
The deliberately weak window makes film coefficients, glass conductance, and solar transmission much harder to blur together.
The deliberately weak window makes film coefficients, glass conductance, and solar transmission much harder to blur together.
The same lightweight room receives much stronger insulation, isolating whether envelope conductance changes by the amount the assemblies promise.
The same lightweight room receives much stronger insulation, isolating whether envelope conductance changes by the amount the assemblies promise.
Ideal heating and cooling loads meet at the same 20°C setpoint. It exposes threshold logic and any hidden deadband assumptions.
Ideal heating and cooling loads meet at the same 20°C setpoint. It exposes threshold logic and any hidden deadband assumptions.
Strong insulation and a zero-deadband thermostat combine two otherwise simple changes and reveal whether their effects compose.
Strong insulation and a zero-deadband thermostat combine two otherwise simple changes and reveal whether their effects compose.
Annual heating and cooling, MWh/yr. Cases 600 and 900 are absolute; every other range is a difference between two cases, so its band can straddle zero and the rail marks where zero falls.
Case 600 rebuilt with heavy thermal mass. The room should bank heat and release it later instead of reacting immediately to every outdoor and solar change.
Heavy mass plus the south overhang. The shade changes the solar pulse; the mass decides what happens to the heat that remains.
Heavy construction with east/west glass. Solar timing and heat storage have to cooperate across the whole day.
Heavy mass, east/west sun, overhangs, and fins must all compose correctly; no single mechanism gets to hide behind the others.
A heavy building follows the same overnight setback and morning setpoint ramp. The ideal heat needed to hold that schedule interacts with yesterday's stored heat, making this a subtle coupled test.
The same scheduled mechanical ventilation meets heavy construction. The model must track how the night airflow removes stored heat and changes the next day's ideal cooling load.
A free-floating sunspace shares heat with a conditioned back room. Solar capture, storage, and interzone transfer must cross the common wall at the right time.
High insulation and high mass work together. The model must separate reduced heat flow from the delayed heat flow caused by storage.
A zero-deadband ideal-load control holds a massive room at 20°C, testing whether stored heat and the heating/cooling thresholds interact cleanly.
The most buffered basic case combines insulation, mass, and tight thermostat control into one coupled response.
One full day of 24 hourly zone loads against the Standard's printed curve, added by Addendum a. Each range is scored on shape and magnitude at once, and missing either limit fails it.
Case 600 rebuilt with heavy thermal mass. The room should bank heat and release it later instead of reacting immediately to every outdoor and solar change.
Case 600 rebuilt with heavy thermal mass. The room should bank heat and release it later instead of reacting immediately to every outdoor and solar change.
A heavy building follows the same overnight setback and morning setpoint ramp. The ideal heat needed to hold that schedule interacts with yesterday's stored heat, making this a subtle coupled test.
High insulation and high mass work together. The model must separate reduced heat flow from the delayed heat flow caused by storage.
High insulation and high mass work together. The model must separate reduced heat flow from the delayed heat flow caused by storage.
A zero-deadband ideal-load control holds a massive room at 20°C, testing whether stored heat and the heating/cooling thresholds interact cleanly.
A zero-deadband ideal-load control holds a massive room at 20°C, testing whether stored heat and the heating/cooling thresholds interact cleanly.
The most buffered basic case combines insulation, mass, and tight thermostat control into one coupled response.
The most buffered basic case combines insulation, mass, and tight thermostat control into one coupled response.
Part two · the equipment
Furnaces, air conditioners, and the air-side systems that move their output around the building: the three remaining scored groups.
The fabric tests ask whether the building is right. These ask whether the machine bolted to it is right. A simulator can get the heat flow through a wall exactly correct and still report the wrong energy, because what it does with that load is a separate model with separate ways to be wrong: how a coil degrades at part load, how much of the fan power lands back in the air, what happens to the moisture it pulls out.
Some of these tests have an exact right answer: the Standard works the solution out analytically instead of simulating it, so a model either matches it or does not. Others publish what the established programs got, the way the fabric cases do. Aris runs 69 cases. 30 of them carry a published pass mark, worth 74 ranges, and those are what the verdict at the top of this chapter counts. The other 39 have no bar to clear, so they are reported as agreement rather than as a pass.
Seven families, three ladders. The fourth column is the case in each family that came closest to its own limit, and how much of that limit it used. It is not a percentage difference, because the families do not share a unit and several of them clear on an absolute limit a percentage cannot see. Under 100% is agreement.
| Family | Agreeing | Quantities | Closest call | Result |
|---|---|---|---|---|
| Heating equipment | 11 / 11 | 53 | HE230 · 98.4% | all agree |
| Cooling, dry coil | 5 / 5 | 35 | CE120 · 77.3% | all agree |
| Cooling, wet coil | 9 / 9 | 108 | CE165 · 73.0% | all agree |
| Cooling over a year | 20 / 20 | 189 | CE540 · 83.5% | all agree |
| Airside, fan coil | 3 / 3 | 120 | AE101 · 10.5% | all agree |
| Airside, single zone | 7 / 7 | 315 | AE226 · 10.7% | all agree |
| Airside, two zone | 14 / 14 | 154 | AE326 · 31.4% | all agree |
The closest call in the chapter is HE230, which used 98.4% of the tolerance its section allows.
A fuel-fired furnace driven through ninety days of prescribed weather: steady efficiency, part-load degradation, cyclic losses, a night setback, and a deliberately undersized unit that cannot keep up.
Agrees when: HE210, HE220 and HE230 are scored against Annex A3 Table A3-8, on furnace input energy and cumulative fan energy. The rest of the ladder has no published acceptance range and is qualification only: each reported quantity lands within the tolerance the case registry declares.
Reference: Published analytical and comparative results accompanying the BESTEST heating-equipment suite.
Every joule of fuel becomes heat and the burner never cycles. Whatever comes out here is the load calculation alone, with none of the equipment in the way.
Only the efficiency moved. The load is still 77.74 GJ, so fuel input should land on exactly 97.22 (that load divided by 0.8), and nothing else should budge.
A milder day means a smaller load, so the furnace runs in short bursts instead of steadily. The part-load curve decides what that cycling costs.
There is nothing to heat. The only wrong answer is any fuel at all.
Load and part-load ratio now move every hour rather than holding at one value, so the cycling penalty has to be tracked hour by hour.
The blower draws power all year and every watt lands back in the airstream as heat. It offsets part of the load it exists to deliver: 432 kWh of fan energy, and the furnace load falls to 29.65 GJ.
Nothing changes but the fan's control mode. Running only with the burner drops fan energy from 432 to 172.76 kWh, and with less fan heat in the air the furnace has more to do, not less: 30.46 GJ against 29.65.
The draft fan moves combustion products rather than room air, so its power is accounted for differently from the blower's. Fan energy rises to 473.18 kWh while the heating load holds at 29.65 GJ.
The first case that checks what the room actually did. Getting the fuel right while the air temperature drifts is not getting the case right.
The setpoint drops overnight and has to recover each morning. The recovery ramp is where models tend to part company.
The furnace can no longer meet the morning recovery, so the room is allowed to lose. It burns more fan energy than HE220, not less (431.4 kWh against 276.1), because a furnace that cannot catch up never gets to stop.
A single-speed DX coil running dry across the compressor map, with indoor and outdoor fan power accounted separately. No condensation, so the sensible heat balance stands alone.
Agrees when: Every reported quantity is within the case’s relative tolerance, the coil does no latent work, no zone load goes unmet, and the energy balance closes.
Reference: Analytical solutions published in NREL/TP-550-30152 with the accompanying equipment performance map.
The reference point for the dry-coil ladder. Nothing condenses on this coil, so every watt it moves is sensible cooling. Mean COP 2.39.
Only the outdoor temperature moved. The compressor pushes heat across a smaller gap and mean COP rises from 2.39 to 3.38, the biggest single lever in the family.
Warmer return air reaches the coil, which helps again but far less than the outdoor drop did: 3.38 to 3.59.
The load nearly vanishes while the outdoor air stays punishing. Fixed overheads now dominate the little work left and COP falls to 1.89, below even the full-load hot case.
The fourth corner of the grid: small load and mild weather together, landing at 2.75 between the two extremes.
The same coil once it starts condensing: sensible and latent split, humidity ratio in the zone, and the apparatus dew point that decides how the two divide.
Agrees when: Every quantity is within tolerance, unmet load stays under 0.2% of the zone total, and the sensible, latent and total balances all close.
Reference: Analytical solutions published in NREL/TP-550-30152 with the accompanying equipment performance map.
The dry-coil ladder never removed a gram of water. From here capacity has to split between cooling the air and wringing it out, at a sensible heat ratio of 0.83.
Let the room sit warmer and it also sits wetter: mean humidity ratio climbs from 0.0082 to 0.0100 on identical gains.
Between the mild and extreme cases, and the only mid-range outdoor condition in the wet-coil family.
Sensible heat ratio falls from 0.83 to 0.66. The coil is doing proportionally more dehumidifying and less cooling, which is where simplified models start to slip.
Sensible heat ratio 0.32: the load is now mostly moisture. Mean humidity ratio doubles the baseline, to 0.0162.
Maximum dehumidification against the worst condenser conditions the family sets.
Barely any load, and what remains is more water than heat. The machine has to short-cycle and dehumidify at the same time.
The wet-coil family's minimum load against its maximum outdoor temperature.
The only case in the family that moves every operand together rather than stepping one at a time. Nothing can be isolated, so this one checks that the pieces still compose.
The same equipment across a full weather year rather than a steady point: outdoor-air mixing, economizer control, and the seasonal accumulation that only an annual run exposes.
Agrees when: CE300 through CE440 are scored against Annex A3 Table A3-7, on annual total cooling energy consumption. CE500 through CE545 have no published acceptance range and are qualification only: annual and cooling-season quantities within tolerance, band-scored quantities inside the published program range, and the annual energy balances closing.
Reference: Comparative results and program ranges published with the BESTEST cooling-equipment suite.
Every case up to here held one condition steady forever. This one runs a whole year, and the machine has to be right in all of it.
Moisture and heat now peak at different hours, so the split the coil has to make between them changes through the day rather than holding.
The same air exchange now arrives through the system rather than through the envelope, so the coil meets it directly instead of after the room has tempered it.
Back to leakage rather than ventilation, but far more of it, and only when the building is in use.
Both paths open at once, so neither can be isolated. They have to compose correctly.
A night setup. The room is allowed to float once the building empties and has to be pulled back each morning; the pulldown is what is being watched.
That is 88% of the unit's 33,280 W rated capacity, held all day and all season. The machine runs close to flat out, with almost no part-load behaviour left to get wrong.
When outdoor air is cooler than the return air, use it instead. Integrated means the compressor may still run alongside it.
Non-integrated control locks out mechanical cooling whenever the economizer runs, so the room loses ground on days when outdoor air alone cannot keep up.
The economizer is switched off above 20 °C outdoors no matter what the return air is doing.
The comparison is now total heat rather than temperature, so humid outdoor air gets rejected even when it is the cooler of the two.
The last rung of the economizer ladder: the comparison and an absolute cutoff together.
Every case above ran its blower without pause. From here the fan cycles, which changes the electricity and also what happens to the moisture sitting on the coil between cycles.
The daily shape is gone and the load simply sits high from May through September, which is the only period this case is scored over.
The cold end of the setpoint sweep. The machine runs far more of the year than the design ever intended.
The middle rung between 15 and 25, filling in the sweep so a model cannot be right at the ends and wrong between them.
The warm end of the sweep. Very little ever runs, so most of the year is the machine correctly deciding to do nothing.
No moisture at all across roughly 47,000 kWh of coil load. Any condensate reported here is condensate that should not exist.
Dry operation crossed with the cold end of the sweep, so the coil runs constantly and still must never condense.
The opposite corner: dry operation with barely any runtime, where cycling dominates whatever little the machine does.
A fan-coil unit solved as a chain of air states: mixing, heating coil, cooling coil, fan heat, and the psychrometrics that connect them.
Agrees when: AE101, AE103 and AE104 are not named by Annex A3, so this family is qualification only: every coil load and every air-node state reproduces the published quasi-analytical solution.
Reference: Quasi-analytical solutions published in NREL/TP-5500-66000.
Heating only: the cooling coil does nothing at all. Every air node from outdoor through mixed, coil, supply, zone and return has a published state to hit, not just the coil total.
Cool dry outdoor air while the room still needs cooling. The coil runs dry, so the latent side should stay at zero.
The wet corner. The coil has to condense, and both the sensible and latent halves are checked at every node.
The same air path with outdoor air and an economizer in front of it, over the range of conditions where the economizer decision itself changes the answer.
Agrees when: AE201, AE205, AE206, AE226 and AE245 are scored against Annex A3 Table A3-9, on heating-coil load and cooling-coil total and sensible load. Every coil load and air-node state is additionally checked against the published quasi-analytical solution.
Reference: Quasi-analytical solutions published in NREL/TP-5500-66000.
Identical air states to the fan-coil case, except two fans now put their own heat into the stream and have to be accounted for separately from the coil.
Fan heat matters most when the coil load is small, and this is the smallest of the three carried over.
Fan heat lands in an airstream the coil is already condensing out of, so it shifts the sensible and latent split, not just the total.
Warm but very dry outside, and the system takes nothing beyond its ventilation minimum. AE245 is the same hour with an economizer allowed to reach for more.
Nearly saturated outside and only a fraction cooler than the room.
Dry-bulb control sees air slightly cooler than the zone and opens, pulling in moisture that enthalpy control would have rejected. Read it against AE245: the same two controls, opposite right answers.
The outdoor air is warmer than the room yet carries less total heat, so enthalpy control opens the damper where dry-bulb control would refuse.
Two zones sharing one air handler, constant-volume and variable-air-volume, with preheat and per-zone reheat, where one zone’s demand changes what the other one gets.
Agrees when: All fourteen cases feed Annex A3 Table A3-9, which scores preheat, cooling-coil total and sensible, and both zones’ reheat loads. The published quasi-analytical solution is additionally reproduced across every coil and reheat load, every air-node state, and the mass, moisture and sensible balances.
Reference: Quasi-analytical solutions published in NREL/TP-5500-66000.
Both zones want heat, in different amounts, and the air handler has one supply temperature to give them. A 45 °F preheat coil and two reheat coils have to settle the difference.
One 55 °F supply stream for two unequal cooling loads. The zone asking for less gets its air reheated after being cooled: deliberately wasteful, and exactly what the case is checking.
The heaviest cooling pair in the family, with the coil condensing hard while reheat still has to trim the lighter zone.
The two-zone counterpart to AE205: warm dry air available, and the system not yet allowed to use it.
Nearly saturated air just below zone temperature, held out by the minimum-ventilation setting.
The damper opens on temperature alone and brings the moisture with it. The pairing with AE345 is the whole point of running both controls.
Free cooling arrives on top of a reheat system, so the economizer and the reheat coils are now working against each other in the same hour.
The same load split, but each zone can now cut its own airflow instead of being reheated at full flow, and the supply fan's pressure rises with flow rather than holding constant.
Throttling is the cheaper way to serve a light zone than cooling then reheating it. The difference against AE303 is what that saves.
Cutting airflow on a wet coil changes how much moisture comes off it, so this is not simply AE304 with a smaller fan bill.
Minimum ventilation only, with the boxes throttling underneath it.
Reduced airflow across a coil facing very humid air, with the damper still at its minimum.
The last case in the chapter, and the one with the most moving at once: temperature-only economizer control, variable airflow, and reheat all in the same hour.
Free cooling and variable airflow at once: the economizer wants more outdoor air while the boxes want less air overall.
Where this comes from. Sections 9, 10 and 11 of ANSI/ASHRAE Standard 140-2023, carrying three of Table A3-10’s five scored groups: Cooling equipment (A3-7), Heating equipment (A3-8) and Air-side equipment (A3-9).
Two kinds of evidence. They are not interchangeable. Thirty of the cases are named by Normative Annex A3, which publishes acceptance ranges and a pass count for each of three equipment test groups; those are scored against the Standard’s own bounds, exactly as the thermal-fabric chapter is. The remaining thirty-nine reproduce published analytical or quasi-analytical solutions within tolerances the source registries declare, and those tolerances are ours. Agreement there means the published solution was reproduced. It is not a pass against a published bar, because for those cases no bar exists.
What was run, not what exists. Coverage of the acceptance criteria is complete: every range case named by Tables A3-7, A3-8, and A3-9 is implemented and evaluated here, all seventy-four of them. The sixty-nine equipment cases reported here cover those acceptance ranges and additional comparisons. This count describes the tests evaluated here; it is not a claim to cover the entire published equipment catalogue.
Sixty-nine source-pinned equipment cases run against the resident Rust kernel: the HE100-HE230 heating ladder, the CE100-CE200 cooling analytical ladder, the CE300-CE545 cooling comparative ladder, and the AE fan-coil, single-zone and two-zone airside families. The results below document those tests; the Standard’s licensed supporting files are not redistributed here.
Part three · what the Standard does not score
The five scored groups above are what Aris claims to pass. We ran the rest of the suite too, and it is here: every case against the six reference programs, and the ground-coupling cases the Standard sets no pass criteria for at all.
The full suite · Informative Annex B8
Standard 140 scores only 62 ranges, and those are above. The suite is bigger than that, so we ran all of it: 260 results, each shown next to the range six research programs got for the same case. Nothing here passes or fails, and the middle is not a bullseye. The range is only what those programs reported.
The reference data was published in 2020 and has not been re-run since, so its EnergyPlus version is 9.0.1. Later chapters compare against EnergyPlus 25.2.
Each cell counts measurements in range over measurements reported; segments sit above the line where we overshoot the range, below it where we undershoot. Click a card for its measurements.
A lightweight room with south glass. It establishes the basic heat balance (conduction, solar gain, internal gains, thermostat control) before the suite changes one ingredient at a time.
Case 600 rebuilt with heavy thermal mass. The room should bank heat and release it later instead of reacting immediately to every outdoor and solar change.
Case 600 with a south overhang. It isolates exterior shading and asks whether the moving shadow lands where the sun actually is.
Heavy mass plus the south overhang. The shade changes the solar pulse; the mass decides what happens to the heat that remains.
The glass moves from south to east and west. Morning and afternoon gains should arrive on time, making orientation and hourly solar geometry do the work.
Heavy construction with east/west glass. Solar timing and heat storage have to cooperate across the whole day.
East/west windows gain overhangs and side fins. It pushes compound shadow geometry without changing the lightweight room beneath it.
Heavy mass, east/west sun, overhangs, and fins must all compose correctly; no single mechanism gets to hide behind the others.
The heating setpoint drops overnight, then ramps back to 20°C in the morning. With unlimited ideal heat, the case exposes schedule timing and the building's peak heat demand.
A heavy building follows the same overnight setback and morning setpoint ramp. The ideal heat needed to hold that schedule interacts with yesterday's stored heat, making this a subtle coupled test.
A fixed mechanical ventilation flow runs overnight, heating is disabled, and ideal cooling is available only by day. The case isolates airflow, schedule timing, and the resulting sensible cooling load.
The same scheduled mechanical ventilation meets heavy construction. The model must track how the night airflow removes stored heat and changes the next day's ideal cooling load.
Only the window system changes. The result tests whether lower emissivity, gas fill, conductance, and solar optics stay internally consistent.
The deliberately weak window makes film coefficients, glass conductance, and solar transmission much harder to blur together.
A free-floating sunspace shares heat with a conditioned back room. Solar capture, storage, and interzone transfer must cross the common wall at the right time.
The same lightweight room receives much stronger insulation, isolating whether envelope conductance changes by the amount the assemblies promise.
High insulation and high mass work together. The model must separate reduced heat flow from the delayed heat flow caused by storage.
Ideal heating and cooling loads meet at the same 20°C setpoint. It exposes threshold logic and any hidden deadband assumptions.
A zero-deadband ideal-load control holds a massive room at 20°C, testing whether stored heat and the heating/cooling thresholds interact cleanly.
Strong insulation and a zero-deadband thermostat combine two otherwise simple changes and reveal whether their effects compose.
The most buffered basic case combines insulation, mass, and tight thermostat control into one coupled response.
With mechanical heating and cooling removed, the hottest, coldest, and average temperatures reveal whether solar and envelope heat are stored or spike directly into the air.
A free-floating high-mass room should damp temperature swings through real storage, making this a clean test of thermal inertia.
With heating and cooling removed, a fixed mechanical ventilation flow runs overnight. The free-floating temperature exposes airflow timing and passive heat storage directly.
The high-mass room floats while night air can cool it. Storage and ventilation must work together without a thermostat covering their tracks.
With heating and cooling removed and envelope losses suppressed, small errors in gains, solar, and air heat capacity become much easier to see.
High insulation and heavy mass remove most fast responses. Temperature drift should be slow, damped, and physically earned.
Internal gains and infiltration disappear while high-conductance elements dominate, creating a clean baseline for the diagnostic cases around it.
This case isolates longwave radiation among interior surfaces so convective and radiant heat exchange cannot quietly trade places.
Exterior longwave exchange is isolated to test how surfaces radiate toward the sky and surroundings.
Interior and exterior longwave mechanisms run together, checking that two individually sound radiation models still conserve energy when composed.
Windows and special conductors are removed so opaque-envelope conduction has nowhere to hide.
Add infiltration to the stripped-down base case and observe the load it creates without other mechanisms muddying the result.
A controlled internal gain tests how heat is split, stored, and delivered to the zone.
Changing exterior absorptance isolates sol-air response on opaque surfaces without changing their underlying conductance.
South glass is introduced into a deliberately simple room so transmitted solar can be measured with minimal interference.
The interior's reflectance changes, testing whether admitted solar is distributed, reflected, absorbed, and stored by the right surfaces.
A simple south aperture gains an overhang, separating shadow geometry from the complexity of the full basic building.
East and west apertures test morning and afternoon timing in a room designed to suppress competing signals.
Overhangs and fins shade east/west glass in the simplified diagnostic building, making geometric errors easier to localize.
A heating/cooling deadband is added to the window diagnostic, isolating the effect of control thresholds on solar-driven loads.
This is the deadband-controlled reference point for another family of one-change-at-a-time tests.
Opaque solid conduction is tested again under a heating/cooling deadband to expose interactions with control logic.
Infiltration is added to the deadband base case, showing how air exchange changes both heating and cooling demand.
Controlled internal gains interact with the deadband, testing whether useful heat and cooling penalties appear in the right seasons.
Exterior absorptance changes while thermostat controls remain active, connecting opaque solar heating to annual loads.
Solar gains are removed so thermal storage can be judged from envelope and internal heat flows alone.
Interior reflectance changes under active controls, testing solar redistribution without changing the amount entering the room.
Solar distribution and heavy thermal storage combine, revealing whether the model puts radiant heat into the surfaces that can actually bank it.
Interior and exterior surface coefficients are prescribed constants, turning off dynamic-film differences to expose the remaining heat balance.
Only the interior surface coefficient is prescribed, isolating room-side convection and radiation assumptions.
Only the exterior coefficient is prescribed, isolating wind, convection, and exterior longwave treatment.
Subtractions between two cases above, each against its own published Annex B8 band. Cancelling the shared model is how the suite isolates one physical change.
This difference cancels much of the shared model and isolates what changing from lightweight to heavyweight construction actually did.
Both cases are heavy. Their difference isolates the response to moving glass from south to east and west.
Subtract the ordinary heavy room from the two-zone sunspace case. What remains is a focused test of interzone coupling and sunspace physics.
Add south glass to a blank high-conductance box. The difference is the purest measure the suite has of how much solar crosses the glazing in the first place.
Interior shortwave absorptance drops from 0.9 to 0.1, so the room stops soaking up sun and starts bouncing it back out. The only isolated test of interior re-loss in the Standard.
Move the windows from south to east and west. The annual totals shift because the gain now arrives morning and evening rather than midday.
A south overhang blocks the high summer sun and lets the low winter sun through. The difference should be nearly all cooling, with heating barely moved.
Overhangs and fins on east and west windows. Harder than shading the south, because the sun these windows see is low in the sky.
Swap a fixed setpoint for a deadband. What the difference isolates is how much of the load was the thermostat chasing small excursions.
Case 395 conducts through solid walls; 400 restores the high-conductance elements. The difference is that element on its own, with the deadband held constant.
Add infiltration to the deadband base case. The two cases are otherwise identical, so the difference is the ventilation path alone.
Internal gains switch on. Heating should fall by roughly what the gains supply, and cooling should rise by the part the building cannot shed.
Interior absorptance again, but under deadband control and against the low-mass base case. A second, independent read on the same interior mechanism.
Exterior solar absorptance rises, so the opaque envelope starts collecting sun. Tests the shortwave path on walls rather than through glass.
Isolates the aperture a second time, in a different cell than 270−220. Two routes to the same physics should agree.
Swap clear double-pane for low-emissivity argon. Cooling should fall sharply and heating should rise as the same coating keeps winter sun out too.
Single pane instead of double. Conduction and solar both increase, and the difference tests whether they scale together correctly.
Add south glass to the heavy box. This is the pairing that shows whether mass and aperture work together rather than merely coexisting.
Mass without an aperture. With no solar to bank, thermal mass should do very little, which makes this the cleanest test of mass acting alone.
The cavity-albedo change once more, this time where the surfaces absorbing it have real heat capacity behind them.
Every surface in a room is quietly trading heat with every other one by infrared, and with the sky outside. Case 195 switches all of that off. Turning it back on is this difference, and the next three take it apart again one face at a time.
Only the inside faces are allowed to trade infrared: warm ceiling to cool floor, wall to wall. The exterior mechanism is held still so nothing else can claim the credit.
Now the outside faces only. A clear night sky is far colder than the air beneath it, so a building radiates to it and loses heat no thermometer outdoors would predict.
The last rung back to the full base case. Take the inside step and the outside step, add them, and they should land on the both-at-once step. That closure is the real point of the quartet: not four numbers, one closure test.
Outdoor air, and nothing else changed. The six reference programs agree here to within a third of a percent, the tightest band in the whole suite, so there is no room to be approximately right about it.
Switch on the heat a household makes just by being occupied. Heating should fall by close to what those gains supply; cooling should rise by whatever the envelope cannot quietly shed.
Sun on an opaque wall still gets in, just slowly and through the material rather than instantly through glass. With no window anywhere on this cell, nothing else can be blamed for the difference.
An overhang, sized the way a good designer sizes one: deep enough to cut the high summer sun, shallow enough to let the low winter sun underneath. Cooling should drop hard while heating barely notices.
Shade and mass at once. Read it against 610−600 and it answers a question a designer actually asks: is an overhang worth more, or less, once the building can hold heat?
Ground coupling · ASHRAE 140 Section 8
Soil stores so much heat, and forgets it so slowly, that it is the hardest material a simulator touches. On the houses in Chapter II it moves annual heating energy by roughly a third. So the ground solver gets its own test: the steady-state BESTEST ground-coupling cases.
The standard publishes no agreement criteria for this suite, so every threshold here is self-chosen: position, not a pass rate. The bar is the per-case spread of the three verified models (TRNSYS/TESS, FLUENT/PAAET, MATLAB/DIT). All 6 sit above it, by 0.31% to 2.71%. Green: a miss smaller than the envelope's own width. Amber: larger. Red: past the conventional ±5% line.
Section 4.4.1 of NREL/TP-550-43388 gives this ground-coupling suite no formal agreement criteria, and Normative Annex A3 of ASHRAE 140 excludes it. The comparisons here use thresholds chosen by Aris; they do not establish a pass against the Standard.
BESTEST ground-coupling (NREL/TP-550-43388), steady-state lane, recorded 2026-10-09 at lane 18ed99068d9c.
Against a flat ±5% of the reference mean, the conventional line for this suite, all 6 cases clear. That figure is secondary here: the table's bar uses the ±5% line only as its scale, and the vs-mean figure is printed in small type beside each reference. ±5% is a tolerance we picked. The envelope is the standard's own published disagreement between models that were checked against each other, and it is the criterion the harmonic lane already uses. Using a chosen tolerance in one half of the suite and a published spread in the other would let the choice of yardstick do the work the physics is supposed to do.
One case is stronger evidence than the rest. GC10a has an exact closed-form reference, the Delsante, Stokes and Walsh three-dimensional solution, the only exact answer anywhere in the suite, with no model spread at all. Against a known answer rather than a consensus we land +1.16%. It is also the one case the standard poses on a semi-infinite solid, so its domain extent is ours to choose and any truncation error is ours; the table marks which domains are specified and which are ours.
On this case the two yardsticks disagree. The exact answer is 2432.6 W, which sits above the three models' own envelope of 2425–2432 W: all three undershoot the closed form. So our +1.19% against the envelope and +1.16% against the exact answer measure different things, and the figure against the exact answer is the smaller. A verified-model envelope is the spread of careful implementations, not the answer.
Scope. Exercises the mesh policy, the finite-volume operator and the kernel steady solve. NOT the shipped foundation model: the lane bypasses HPXML, annual initialization, room coupling, the cyclic initializer and every production foundation default, because a validation case states its boundaries literally. Read this as evidence about the mesh policy and the finite-volume operator, not about the foundation model that ships.
Each case is refined up an adaptive mesh ladder until two consecutive refinements move the answer by less than 0.1%, so the number reported is the one the mesh stopped changing, not the one the first mesh produced. The six together took 2,712,490 nodes at their converged levels and 81 minutes of compute. These results come from a separate steady-state simulation campaign.
| Case | Aris, W | Verified envelope · reference, vs mean | Position · beyond the envelope, bar to the ±5% line |
|---|---|---|---|
| GC10a L3 · 240 × 240 m ours | 2460.9 | 2425–2432 exact 2432.6 · +1.16% | +1.19% above |
| GC30a L5 · 30 × 20 m specified | 2703.5 | 2585–2695 mean 2640.7 · +2.38% | +0.31% above |
| GC30b L4 · 15 × 15 m specified | 2588.8 | 2504–2570 mean 2535.7 · +2.09% | +0.73% above |
| GC30c L4 · 15 × 8 m specified | 2212.5 | 2123–2154 mean 2138.0 · +3.48% | +2.71% above |
| GC60b L4 · 15 × 15 m specified | 2182.5 | 2104–2128 mean 2115.0 · +3.19% | +2.56% above |
| GC65b L3 · 15 × 15 m specified | 2040.2 | 1991–2004 mean 1996.3 · +2.20% | +1.81% above |
The suite's sensitivity tests: change one thing and the load should move by roughly this much. Percentage error is not the first thing to read here. Where the three models disagree widely a large percentage can still sit inside their range; where they agree tightly a small one can fall outside it. The last column is the one that matters: 3 of 4 of our differences land within the models' own disagreement.
The exception. GC65b-GC60b is the tightest agreement in the set, with the three models within 11 W of each other, and our -142.3 W sits outside that band at -19.9%. That is the strongest disagreement this suite records against us, and it falls where the models agree most closely. We have not attributed it to a mechanism yet, so it is reported rather than explained.
| Difference | Aris | Verified models | Mean | vs mean | vs spread |
|---|---|---|---|---|---|
| GC30a-GC10a | 242.6 | 215 / 160 / 263 | 212.7 | +14.1% | inside |
| GC30b-GC30a | -114.7 | -109 / -81 / -125 | -105.0 | -9.2% | inside |
| GC60b-GC30b | -406.3 | -420 / -400 / -442 | -420.7 | +3.4% | inside |
| GC65b-GC60b | -142.3 | -119 / -113 / -124 | -118.7 | -19.9% | outside |
Each mark comes from the same 8,760-hour room-level solver as the BESTEST battery above. “Inside” means the raw Aris result lies between the minimum and maximum reference-program results; no tolerance widens the range, sitting inside it is not an ASHRAE certification, and the accompanying data records every result.
Edition boundary: Scored against the Informative Annex B8 reference-program spread (raw min/max, six programs). This is NOT a conformance claim: the Standard’s own acceptance criteria live in Normative Annex A3 over a different nine-program reference set, and the two are not nested. The Annex A3 criteria, including the daily hourly time-series ranges Addendum a (2025-08-29) added, are scored separately in the acceptance section of this report. Addendum b (2026-04-24) adds Section 13 empirical validation tests and is out of scope for this chapter.
Two ways to size a home, two different checks: we test our Manual J calculator against the reference worksheets and compare Talos's physical model with EnergyPlus on the same 44 homes.
Nearly every furnace and heat pump in North America is sized by one document: ACCA's Manual J, a worksheet of lookup tables and steady-state arithmetic. It's a procedure, not a simulation. A physics model is right when it matches the building; a Manual J implementation is right when it matches the book. Being more accurate than the book is a bug.
Aris implements both and keeps them separate: a Manual J calculator that follows the book, and the physics engine that sizes the equipment we install. This chapter runs each against the 44 reference homes that ship with OpenStudio-HPXML: 37 ACCA worked-example houses with per-component worksheets, and 7 HERS HVAC test homes without one. Twenty-six of the 37 are configurations of a single happy little house in Fayetteville, Arkansas, named Bob Ross.
So there are three things to check. The Manual J calculator is compared row by row against those worksheets. The physics engine is compared against EnergyPlus on the same houses, physics against physics. Then the worksheet and the physics are set against each other, first on whole-house sizing and then room by room, which is where the two part ways.
Procedural lane · primary evidence
Nothing here is a physics judgment: the right answer is the worksheet's answer. We parse each house from its published HPXML file, run it through the Aris Manual J calculator, and check it line by line against the OS-HPXML reference worksheet for the same house. The bar is max(2 Btu/h, 2%) on every component row and every total.
Physics lane · supporting evidence
The lane above asks whether we reproduce a worksheet. This lane asks a harder question of the same 44 houses: what these buildings do when they are simulated hour by hour instead of totalled by a procedure.
Against EnergyPlus that is physics against physics, so a gap is two models disagreeing. Against the Manual J worksheet it is physics against a prescribed procedure, so a gap is what the worksheet leaves out to stay doable by hand. Neither is a pass bar.
EnergyPlus 25.2.0-cf7368216c; OpenStudio-HPXML's own ideal-loads model, built from the reference HPXML with no Aris involvement; 6 zone timesteps an hour (EnergyPlus's documented HVAC recommendation) and, on ground-coupled cases, timestep Foundation:Kiva updates on EnergyPlus's native 0.02 m / 1.5 growth mesh, replacing OS-HPXML's speed profile (one zone step an hour, every-zone-step Kiva, 0.2 m / 3 mesh); foundation-free cases run one ordinary weather year, and every founded case reports the final year of an independently simulated 29-year Kiva prefix whose measured year preserves the source RunPeriod's pinned weekday. The independent 28→29-year convergence report records 6 founded cases converged and 30 capped without convergence; hourly output. The Aris side runs the same 8,760 EPW hours after the production 30-day cyclic weather warm-up. Exported models carry these same settings, so a result here is reproducible outside this report. Two things this setup is not: a fully converged ground history, and a pure solver comparison. EnergyPlus reads OS-HPXML's model while Aris reads our own importer's reading of the same file, so surface enumeration and geometry are ours.
First question · one hour of the year
Peak load is the single worst hour of the year, the number equipment gets sized from. Both models report their own worst hour for every house; the median gap is heating 0.44% over 43 comparable houses, cooling 1.50% over 44. In the charts below, bars right of the zero line sized above EnergyPlus and bars left sized below.
Peak timing is reported alongside peak size. The hovercards print both models' timestamps, house by house, so differences in the worst day and hour can be inspected directly.
Every member’s reference sits under the near-zero floor, so percentages are not printed.
A family collapses only when every member's deltas agree within 0.5 points: the HVAC steps, the ±duct pairs, Walker's ceiling options. A “reference near zero” row prints its absolute values, since a percentage of almost-zero means nothing.
Both sides report the same 8,760 measured weather hours and each reports its own peak: nothing selects days, nothing zeroes gains, and nothing offsets a design temperature. The RunPeriod differs by design: the 36 ground-coupled cases run an audited 29-year ground prefix ahead of the measured year, because EnergyPlus warmup converges zone air but not the Kiva ground domain, while the 8 foundation-free cases run the measured year alone. The founded prefix preserves the source RunPeriod’s pinned weekday under EnergyPlus’s 8,760-hour TMY-year repetition. EnergyPlus solves OpenStudio-HPXML’s own ideal-loads IDF with 6 zone timesteps per hour, timestep Kiva updates, a 0.02 m minimum cell, and 1.5 maximum growth coefficient. The capacity-capped wind tunnel stays at one year on every case and is a capacity-policy sensitivity experiment, never a second annual reference. Each side peaks where it peaks; forcing both onto one hour would re-introduce the selection rule this lane exists to remove. The Manual J worksheet total rides beside each house rather than on this rail, because it pairs a design load against an annual extreme: read it as spread, not accuracy.
Worksheet, design day, real weather
Manual J is hand arithmetic. It applies no safety factor, but its conventions lean conservative. EnergyPlus sizes from a worst day it builds rather than one that actually happened, then multiplies by the safety factor the industry usually adds. Aris simulates the real weather year at the design conditions and adds no factor. Same houses, three answers. The chart below puts all three on one axis, and each house's card counts how many hours of its year the load runs above each answer.
The way each engine sizes diverges even further. Manual J and the EnergyPlus design day use the conditions each house's own worksheet states, generally the 99% winter and 1% summer percentiles. Aris uses the 99.6% winter and 0.4% summer conditions from the weather station, colder and hotter on 42 of the 44 houses, because we expect extremes to keep getting worse. That is a choice about the weather we design against, not about the physics.
For heating sizing, Aris counts the sunlight actually falling on the house and a minimum of internal heat. Manual J counts neither. EnergyPlus runs with no sun and its internal gains switched off. Only EnergyPlus multiplies by a sizing factor. Much of the spread below comes from those choices, not from a disagreement about the building.
We size for an occupied home. Our heating calculation credits a small amount of heat from refrigeration and one sleeping occupant. When nobody is home, we accept that the temperature may occasionally dip below the setpoint. This is a design-sizing choice; energy ratings use their prescribed operating assumptions.
Whole-house and room loads
The worksheet and the physics engine disagree at both house and room scale. Across the plotted houses, the middle 90% of heating differences spans 80 percentage points; the room differences span 49 points. On cooling those spreads are 28 and 146 points. Median absolute room differences are 16% on heating and 19% on cooling. These are disagreements between methods; the single-zone EnergyPlus reference does not establish which room answer is more accurate.
Three things the worksheet leaves out matter most at the room level. It has no timeline: on cooling it adds up each surface's worst moment as if they all happened at once, though a room's east glass peaks in the morning and its west glass in the afternoon, and on heating it treats the coldest hour as if the house had always been that cold. It has no thermal mass, so the heat that floors, walls, and furniture soak up and give back hours later is not in the picture. And it moves no heat between rooms, so each room is calculated as though its neighbors were identical to it.
Opposing room differences can cancel in a house total, but that is not guaranteed across this corpus. Whole-house agreement alone cannot establish room comfort or the right distribution of heating and cooling.
And every dot shows the worksheet at its best: exact take-offs, actual R‑values, true orientation. In the field, 1 in 4 contractors sizes by square‑feet‑per‑ton rules with no load calculation at all, 38% admit padding the answer on purpose (FSEC, 489 contractors), and across nine field studies 31–93% of installed systems carry a sizing fault (DOE, 2018).
Accuracy needs both good data and good physics.
Manual J is done two ways, both compared here against the same per-room physics: ACCA’s room-by-room procedure, which Manual D requires for duct design, and the block load split by floor area, which widens the room miss to 24% and 39%. Hollow dots are below-grade rooms, where the worksheet books surfaces at the outdoor design temperature difference and the solver conducts them to the site’s own deep-ground temperature; the claim stands on the solid dots.
This comparison models individual rooms, so its totals differ slightly from the whole-house comparison. 11 cases ship no per-space worksheet, and on 2 more the Aris run itself failed; both are declared as gaps below, named and separated by whose they are. Rooms under 1,000 Btu/h stay out of the dots as denominator noise, but stay in every total. No industry per-room reference exists to referee the physics side: the corpus’s reference EnergyPlus pipeline models the conditioned space as a single zone.
Not a bug, but a convention anyone sizing from design days in EnergyPlus inherits. Kiva, its ground model, starts design-day runs on spring-cold soil and holds it there through the warmup. The July slab then drinks the cooling load, and 20 of 44 houses get a near-zero cooling answer, most of the Bob Ross family among them. Against the year the house actually runs, those answers sit under the load for roughly four thousand hours. The annual runs are spared because their soil moves with the weather.
Steady-state worksheet, ducts and blower heat excluded, at Manual J's own prescribed 99%/1% design conditions, the number the book's recipe would install (a re-evaluation at the shared 99.6%/0.4% header sits in the data table). No safety factor by design: ACCA frames Manual J as right-sizing and hands oversizing latitude to Manual S equipment selection. No warmup, because a worksheet has no state.
SizingPeriod:DesignDay built from the weather file's own ASHRAE design conditions, repeat-day warmup to convergence, Kiva ground held at its design-day initialization (EnergyPlus 25.2.0-cf7368216c). Diamond marks the raw ideal-loads peak; the tick marks ×1.25 heating / ×1.15 cooling, the ASHRAE 90.1 Appendix G oversizing convention, applied as a labelled arithmetic step because it is common practice, not an EnergyPlus default (the IDD default is 1.0). Exceedance and the flat-cap experiment count against the factored value, the capacity this recipe would actually install.
The shipped design load: the hourly room solver over the real weather sequence, with the design-day snap and occupancy-floor gains conventions, sized per room and summed here. No explicit safety factor; the conservatism lives in the percentile choice and the snap convention. The anchor is the station's 99.6%/0.4% pair, the same one a drawn design gets, rather than the condition each fixture's worksheet was written at. Both are printed in the data table. Those worksheet conditions are published per house rather than derived from the weather file, so they carry no single percentile: two of these houses share a weather file and still state design temperatures five degrees apart.
| House | Zone | MJ htg | E+ htg raw/×1.25 | Aris htg | MJ clg | E+ clg raw/×1.15 | Aris clg | Worksheet basis °F · Aris basis °F · MJ re-run at Aris's | Load above each, htg · clg |
|---|---|---|---|---|---|---|---|---|---|
| Cobb Residence | 1A | 6,426 | 2,323 / 2,904 | 0 | 20,476 | 14,682 / 16,884 | 15,576 | 47 / 93°F · Aris 48 / 92°F · MJ re-run there: 6,242 / 20,239 | no test · 0 / 0 / 0 |
| Walker Ceiling Option 1 | 1A | 8,726 | 2,397 / 2,996 | 2,859 | 15,255 | 7,707 / 8,863 | 14,822 | 52 / 90°F · Aris 48 / 92°F · MJ re-run there: 10,488 / 15,800 | no test · 0 / 387 / 0 |
| Walker Ceiling Option 2 | 1A | 8,726 | 2,283 / 2,854 | 2,782 | 14,811 | 7,365 / 8,470 | 14,144 | 52 / 90°F · Aris 48 / 92°F · MJ re-run there: 10,488 / 15,355 | no test · 0 / 451 / 0 |
| Walker Residence | 1A | 8,726 | 2,412 / 3,015 | 2,872 | 14,588 | 7,386 / 8,494 | 14,306 | 52 / 90°F · Aris 48 / 92°F · MJ re-run there: 10,488 / 15,133 | no test · 0 / 420 / 0 |
| Vatilo Improved Ducts | 2A | 19,636 | 10,958 / 13,698 | 9,123 | 13,438 | 8,994 / 10,343 | 16,461 | 31 / 94°F · Aris 29 / 97°F · MJ re-run there: 20,582 / 14,106 | 0 / 0 / 18 · 148 / 592 / 5 |
| Vatilo Residence | 2A | 19,636 | 10,958 / 13,698 | 9,123 | 13,438 | 8,994 / 10,343 | 16,461 | 31 / 94°F · Aris 29 / 97°F · MJ re-run there: 20,582 / 14,106 | 0 / 0 / 18 · 148 / 592 / 5 |
| Bell Residence | 3A | 27,037 | 19,119 / 23,899 | 16,885 | 27,774 | 16,322 / 18,770 | 27,442 | 9 / 97°F · Aris 12 / 100°F · MJ re-run there: 25,619 / 28,489 | 0 / 0 / 21 · 0 / 208 / 0 |
| HVAC1a | 3B | 32,992 | 19,216 / 24,020 | 19,497 | 39,477 | 28,609 / 32,900 | 32,945 | 33 / 106°F · Aris 31 / 108°F · MJ re-run there: 35,640 / 41,346 | 0 / 0 / 16 · 0 / 1 / 1 |
| HVAC1b | 3B | 32,992 | 19,216 / 24,020 | 19,497 | 39,477 | 28,609 / 32,900 | 32,945 | 33 / 106°F · Aris 31 / 108°F · MJ re-run there: 35,640 / 41,346 | 0 / 0 / 16 · 0 / 1 / 1 |
| Bob Ross 3-1 | 4A | 35,980 | 34,116 / 42,645 | 31,110 | 19,284 | 0 / 0 | 22,851 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 40,520 / 20,360 | 7 / 0 / 22 · 259 / 4289 / 32 |
| Bob Ross 3-10 | 4A | 37,647 | 35,145 / 43,931 | 31,977 | 21,171 | 0 / 0 | 24,472 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 22,302 | 6 / 0 / 22 · 211 / 4338 / 27 |
| Bob Ross 3-11 | 4A | 37,647 | 34,488 / 43,110 | 31,216 | 21,171 | 0 / 0 | 24,392 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 22,302 | 3 / 0 / 22 · 206 / 4365 / 29 |
| Bob Ross 3-12 | 4A | 45,463 | 46,476 / 58,095 | 43,410 | 22,541 | 1,163 / 1,337 | 25,844 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 51,199 / 23,838 | 22 / 0 / 24 · 202 / 3513 / 37 |
| Bob Ross 3-13 | 4A | 47,634 | 37,967 / 47,459 | 38,591 | 22,864 | 0 / 0 | 25,489 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 53,811 / 24,233 | 0 / 0 / 8 · 129 / 4288 / 14 |
| Bob Ross 3-14 | 4A | 39,876 | 36,293 / 45,366 | 34,080 | 26,417 | 1,919 / 2,207 | 27,030 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 44,907 / 27,637 | 4 / 0 / 20 · 48 / 3535 / 30 |
| Bob Ross 3-15 | 4A | 34,424 | 32,307 / 40,384 | 27,728 | 20,253 | 0 / 0 | 22,638 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 38,767 / 21,257 | 2 / 0 / 23 · 129 / 4337 / 6 |
| Bob Ross 3-16 | 4A | 46,837 | 26,934 / 33,668 | 31,815 | 18,544 | 4,052 / 4,660 | 20,368 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 51,894 / 19,515 | 0 / 0 / 0 · 99 / 2669 / 12 |
| Bob Ross 3-17 | 4A | 43,346 | 40,304 / 50,380 | 38,209 | 22,579 | 0 / 0 | 26,251 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 48,815 / 23,881 | 8 / 0 / 23 · 212 / 4042 / 30 |
| Bob Ross 3-18 | 4A | 38,415 | 35,752 / 44,690 | 31,118 | 20,965 | 0 / 0 | 24,333 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 43,262 / 22,072 | 3 / 0 / 23 · 187 / 4351 / 16 |
| Bob Ross 3-19 | 4A | 43,346 | 40,730 / 50,913 | 36,887 | 22,579 | 0 / 0 | 25,699 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 48,815 / 23,881 | 7 / 0 / 24 · 160 / 4099 / 20 |
| Bob Ross 3-2 | 4A | 37,647 | 35,130 / 43,913 | 31,978 | 21,237 | 0 / 0 | 24,483 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 22,341 | 6 / 0 / 22 · 205 / 4336 / 27 |
| Bob Ross 3-20 | 4A | 43,346 | 40,304 / 50,380 | 38,209 | 22,579 | 0 / 0 | 26,251 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 48,815 / 23,881 | 8 / 0 / 23 · 212 / 4042 / 30 |
| Bob Ross 3-21 | 4A | 39,102 | 36,504 / 45,630 | 31,991 | 21,190 | 0 / 0 | 24,550 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 44,036 / 22,324 | 4 / 0 / 23 · 182 / 4305 / 17 |
| Bob Ross 3-22 | 4A | 49,223 | 42,273 / 52,841 | 37,699 | 23,635 | 6,364 / 7,319 | 29,229 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 55,434 / 25,033 | 0 / 0 / 23 · 309 / 2646 / 30 |
| Bob Ross 3-23 | 4A | 29,338 | 29,408 / 36,760 | 27,041 | 19,898 | 4,572 / 5,258 | 21,020 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 33,039 / 21,032 | 18 / 0 / 25 · 87 / 2554 / 25 |
| Bob Ross 3-3 | 4A | 37,647 | 35,106 / 43,883 | 31,887 | 22,430 | 1,109 / 1,275 | 26,700 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 23,497 | 5 / 0 / 22 · 236 / 3769 / 25 |
| Bob Ross 3-4 | 4A | 37,647 | 35,154 / 43,943 | 32,121 | 20,412 | 0 / 0 | 22,630 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 21,572 | 6 / 0 / 23 · 169 / 4275 / 33 |
| Bob Ross 3-5 | 4A | 37,647 | 35,038 / 43,798 | 31,741 | 25,126 | 3,738 / 4,299 | 28,653 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 26,228 | 5 / 0 / 22 · 181 / 3280 / 24 |
| Bob Ross 3-6 | 4A | 37,251 | 34,748 / 43,435 | 31,328 | 21,308 | 0 / 0 | 24,346 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 41,952 / 22,408 | 5 / 0 / 23 · 186 / 4357 / 22 |
| Bob Ross 3-7 | 4A | 42,579 | 38,714 / 48,393 | 36,745 | 24,098 | 2,841 / 3,267 | 27,441 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 47,951 / 25,425 | 5 / 0 / 21 · 193 / 3242 / 23 |
| Bob Ross 3-8 | 4A | 37,647 | 34,948 / 43,685 | 31,977 | 21,171 | 0 / 0 | 24,472 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 22,302 | 5 / 0 / 22 · 223 / 4389 / 33 |
| Bob Ross 3-9 | 4A | 37,647 | 34,815 / 43,519 | 31,977 | 21,171 | 0 / 0 | 24,472 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 22,302 | 5 / 0 / 22 · 235 / 4418 / 43 |
| Bob Ross 4 | 4A | 37,647 | 35,123 / 43,904 | 32,083 | 21,998 | 0 / 0 | 23,861 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 23,130 | 5 / 0 / 22 · 142 / 4349 / 33 |
| Bob Ross 5 | 4A | 39,328 | 36,443 / 45,554 | 33,251 | 23,634 | 3,234 / 3,719 | 25,990 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 44,291 / 24,822 | 5 / 0 / 21 · 152 / 3267 / 35 |
| Bob Ross Residence | 4A | 37,647 | 35,140 / 43,925 | 31,977 | 21,171 | 0 / 0 | 24,472 | 15 / 93°F · Aris 8 / 95°F · MJ re-run there: 42,397 / 22,302 | 6 / 0 / 22 · 211 / 4340 / 27 |
| Long Residence | 5A | 41,746 | 43,991 / 54,989 | 40,710 | 16,059 | 3,904 / 4,490 | 18,951 | -5 / 89°F · Aris -10 / 92°F · MJ re-run there: 44,295 / 17,111 | 63 / 0 / 83 · 9 / 1306 / 0 |
| Smith Residence | 5A | 54,653 | 44,240 / 55,300 | 47,490 | 21,369 | 4,649 / 5,346 | 19,184 | -6 / 90°F · Aris -10 / 92°F · MJ re-run there: 57,353 / 22,166 | 9 / 6 / 139 · 0 / 947 / 0 |
| Victor Improved Ducts | 5A | 52,493 | 43,980 / 54,975 | 46,170 | 17,567 | 12,505 / 14,381 | 19,377 | 3 / 90°F · Aris -2 / 93°F · MJ re-run there: 56,708 / 19,107 | 0 / 0 / 33 · 35 / 169 / 8 |
| Victor Residence | 5A | 52,493 | 43,980 / 54,975 | 46,170 | 17,567 | 12,505 / 14,381 | 19,377 | 3 / 90°F · Aris -2 / 93°F · MJ re-run there: 56,708 / 19,107 | 0 / 0 / 33 · 35 / 169 / 8 |
| HVAC2a | 5B | 54,901 | 33,793 / 42,241 | 36,192 | 23,556 | 17,281 / 19,873 | 21,797 | 6 / 88°F · Aris -1 / 90°F · MJ re-run there: 60,935 / 25,575 | 0 / 0 / 0 · 0 / 33 / 6 |
| HVAC2b | 5B | 54,901 | 33,793 / 42,241 | 36,192 | 23,556 | 17,281 / 19,873 | 21,797 | 6 / 88°F · Aris -1 / 90°F · MJ re-run there: 60,935 / 25,575 | 0 / 0 / 0 · 0 / 33 / 6 |
| HVAC2c | 5B | 54,901 | 33,793 / 42,241 | 36,192 | 23,556 | 17,281 / 19,873 | 21,797 | 6 / 88°F · Aris -1 / 90°F · MJ re-run there: 60,935 / 25,575 | 0 / 0 / 0 · 0 / 33 / 6 |
| HVAC2d | 5B | 54,901 | 33,793 / 42,241 | 36,192 | 23,556 | 17,281 / 19,873 | 21,797 | 6 / 88°F · Aris -1 / 90°F · MJ re-run there: 60,935 / 25,575 | 0 / 0 / 0 · 0 / 33 / 6 |
| HVAC2e | 5B | 54,901 | 33,793 / 42,241 | 36,192 | 23,556 | 17,281 / 19,873 | 21,797 | 6 / 88°F · Aris -1 / 90°F · MJ re-run there: 60,935 / 25,575 | 0 / 0 / 0 · 0 / 33 / 6 |
These charts cap ideal-loads delivery at each answer's number and re-run the full year. The machine they model does not exist: a flat Btu/h ceiling with no heat-pump capacity droop at low ambient, no emitters, no auxiliary heat, no storage, capacity split across rooms in fixed shares of their uncapped peaks. So these are capped-delivery exceedance counts under that fiction, not comfort predictions. Answering that properly means simulating the actual selected hardware, which we have not built yet.
Within the fiction the numbers are exact, and a second referee broadly agrees: EnergyPlus, capped at the same capacities in a deliberately cheaper one-year sensitivity run, lands within tens of hours on every arm it can test. The one substantive spread is on Bob Ross heating, where the two solvers disagree about the basement load itself. This is not the v7 annual-energy basis, which runs an audited 29-year, source-weekday-preserving ground prefix.
Under the fiction:
| House | Zone | Mode | Uncapped peak / annual | Manual J | E+ DD ×factor | Aris |
|---|---|---|---|---|---|---|
| Cobb Residence | 1A | heating | no test | no test | no test | no test |
| Cobb Residence | 1A | cooling | 12,782 / 27.7 MBtu | 20,476 → 0h / 0.0°F / 7,694 unused / max 12,782 | 16,884 → 0h / 0.0°F / 4,102 unused / max 12,782 | 15,576 → 0h / 0.0°F / 2,794 unused / max 12,782 |
| Walker Ceiling Option 1 | 1A | heating | no test | no test | no test | no test |
| Walker Ceiling Option 1 | 1A | cooling | 11,720 / 36.8 MBtu | 15,255 → 0h / 0.0°F / 3,535 unused / max 11,720 | 8,863 → 85h / 1.9°F / 0 unused / max 8,863 | 14,822 → 0h / 0.0°F / 3,102 unused / max 11,720 |
| Walker Ceiling Option 2 | 1A | heating | no test | no test | no test | no test |
| Walker Ceiling Option 2 | 1A | cooling | 11,330 / 36.0 MBtu | 14,811 → 0h / 0.0°F / 3,481 unused / max 11,330 | 8,470 → 115h / 2.0°F / 0 unused / max 8,470 | 14,144 → 0h / 0.0°F / 2,814 unused / max 11,330 |
| Walker Residence | 1A | heating | no test | no test | no test | no test |
| Walker Residence | 1A | cooling | 11,268 / 36.0 MBtu | 14,588 → 0h / 0.0°F / 3,320 unused / max 11,268 | 8,494 → 90h / 1.9°F / 0 unused / max 8,494 | 14,306 → 0h / 0.0°F / 3,038 unused / max 11,268 |
| Vatilo Residence ×2 | 2A | heating | 11,782 / 4.7 MBtu | 19,636 → 0h / 0.0°F / 7,854 unused / max 11,782 | 13,698 → 0h / 0.0°F / 1,916 unused / max 11,782 | 9,123 → 14h / 2.4°F / 0 unused / max 9,123 |
| Vatilo Residence ×2 | 2A | cooling | 17,388 / 30.9 MBtu | 13,438 → 78h / 3.0°F / 0 unused / max 13,438 | 10,343 → 579h / 6.2°F / 0 unused / max 10,343 | 16,461 → 1h / 0.6°F / 0 unused / max 16,461 |
| Bell Residence | 3A | heating | 18,343 / 19.6 MBtu | 27,037 → 0h / 0.0°F / 8,694 unused / max 18,343 | 23,899 → 0h / 0.0°F / 5,556 unused / max 18,343 | 16,885 → 14h / 1.4°F / 0 unused / max 16,885 |
| Bell Residence | 3A | cooling | 25,064 / 33.4 MBtu | 27,774 → 0h / 0.0°F / 2,710 unused / max 25,064 | 18,770 → 190h / 4.2°F / 0 unused / max 18,770 | 27,442 → 0h / 0.0°F / 2,378 unused / max 25,064 |
| HVAC1a ×2 | 3B | heating | 22,366 / 16.0 MBtu | 32,992 → 0h / 0.0°F / 10,626 unused / max 22,366 | 24,020 → 0h / 0.0°F / 1,654 unused / max 22,366 | 19,497 → 10h / 2.0°F / 0 unused / max 19,497 |
| HVAC1a ×2 | 3B | cooling | 32,978 / 52.5 MBtu | 39,477 → 0h / 0.0°F / 6,499 unused / max 32,978 | 32,900 → 0h / 0.0°F / 0 unused / max 32,900 | 32,945 → 0h / 0.0°F / 0 unused / max 32,945 |
| Bob Ross 3-1 | 4A | heating | 38,879 / 31.9 MBtu | 35,980 → 3h / 0.8°F / 0 unused / max 35,980 | 42,645 → 0h / 0.0°F / 3,766 unused / max 38,879 | 31,110 → 41h / 3.0°F / 0 unused / max 31,110 |
| Bob Ross 3-1 | 4A | cooling | 25,402 / 36.5 MBtu | 19,284 → 1232h / 3.2°F / 0 unused / max 19,284 | 0 → 4540h / 24.3°F / 0 unused / max 0 | 22,851 → 63h / 0.8°F / 0 unused / max 22,851 |
| Bob Ross 3-10 | 4A | heating | 40,056 / 32.6 MBtu | 37,647 → 1h / 0.6°F / 0 unused / max 37,647 | 43,931 → 0h / 0.0°F / 3,875 unused / max 40,056 | 31,977 → 46h / 3.1°F / 0 unused / max 31,977 |
| Bob Ross 3-10 | 4A | cooling | 27,132 / 38.5 MBtu | 21,171 → 1119h / 2.9°F / 0 unused / max 21,171 | 0 → 4584h / 25.1°F / 0 unused / max 0 | 24,472 → 53h / 0.8°F / 0 unused / max 24,472 |
| Bob Ross 3-11 | 4A | heating | 38,852 / 31.7 MBtu | 37,647 → 0h / 0.3°F / 0 unused / max 37,647 | 43,110 → 0h / 0.0°F / 4,258 unused / max 38,852 | 31,216 → 53h / 2.9°F / 0 unused / max 31,216 |
| Bob Ross 3-11 | 4A | cooling | 27,037 / 38.7 MBtu | 21,171 → 1108h / 2.8°F / 0 unused / max 21,171 | 0 → 4600h / 25.2°F / 0 unused / max 0 | 24,392 → 50h / 0.8°F / 0 unused / max 24,392 |
| Bob Ross 3-12 | 4A | heating | 57,199 / 45.1 MBtu | 45,463 → 26h / 3.9°F / 0 unused / max 45,463 | 58,095 → 0h / 0.0°F / 896 unused / max 57,199 | 43,410 → 39h / 4.9°F / 0 unused / max 43,410 |
| Bob Ross 3-12 | 4A | cooling | 29,393 / 38.6 MBtu | 22,541 → 1069h / 3.3°F / 0 unused / max 22,541 | 1,337 → 4156h / 22.5°F / 0 unused / max 1,337 | 25,844 → 152h / 1.3°F / 0 unused / max 25,844 |
| Bob Ross 3-13 | 4A | heating | 42,811 / 35.2 MBtu | 47,634 → 0h / 0.0°F / 4,823 unused / max 42,811 | 47,459 → 0h / 0.0°F / 4,648 unused / max 42,811 | 38,591 → 6h / 1.3°F / 0 unused / max 38,591 |
| Bob Ross 3-13 | 4A | cooling | 27,767 / 38.6 MBtu | 22,864 → 643h / 2.1°F / 0 unused / max 22,864 | 0 → 4510h / 24.8°F / 0 unused / max 0 | 25,489 → 12h / 0.6°F / 0 unused / max 25,489 |
| Bob Ross 3-14 | 4A | heating | 41,658 / 33.7 MBtu | 39,876 → 0h / 0.4°F / 0 unused / max 39,876 | 45,366 → 0h / 0.0°F / 3,708 unused / max 41,658 | 34,080 → 34h / 2.8°F / 0 unused / max 34,080 |
| Bob Ross 3-14 | 4A | cooling | 29,880 / 41.9 MBtu | 26,417 → 119h / 1.0°F / 0 unused / max 26,417 | 2,207 → 4305h / 23.4°F / 0 unused / max 2,207 | 27,030 → 32h / 0.7°F / 0 unused / max 27,030 |
| Bob Ross 3-15 | 4A | heating | 34,754 / 28.4 MBtu | 34,424 → 0h / 0.1°F / 0 unused / max 34,424 | 40,384 → 0h / 0.0°F / 5,630 unused / max 34,754 | 27,728 → 53h / 2.5°F / 0 unused / max 27,728 |
| Bob Ross 3-15 | 4A | cooling | 23,443 / 36.9 MBtu | 20,253 → 323h / 1.5°F / 0 unused / max 20,253 | 0 → 4542h / 24.0°F / 0 unused / max 0 | 22,638 → 0h / 0.2°F / 36 unused / max 22,602 |
| Bob Ross 3-16 | 4A | heating | 31,668 / 27.7 MBtu | 46,837 → 0h / 0.0°F / 15,169 unused / max 31,668 | 33,668 → 0h / 0.0°F / 2,000 unused / max 31,668 | 31,815 → 0h / 0.0°F / 147 unused / max 31,668 |
| Bob Ross 3-16 | 4A | cooling | 21,929 / 30.0 MBtu | 18,544 → 24h / 1.3°F / 0 unused / max 18,544 | 4,660 → 2996h / 17.1°F / 0 unused / max 4,660 | 20,368 → 0h / 0.5°F / 0 unused / max 20,368 |
| Bob Ross 3-17 ×2 | 4A | heating | 47,874 / 42.9 MBtu | 43,346 → 5h / 1.3°F / 0 unused / max 43,346 | 50,380 → 0h / 0.0°F / 2,506 unused / max 47,874 | 38,209 → 39h / 3.6°F / 0 unused / max 38,209 |
| Bob Ross 3-17 ×2 | 4A | cooling | 29,372 / 38.3 MBtu | 22,579 → 905h / 2.9°F / 0 unused / max 22,579 | 0 → 4225h / 23.9°F / 0 unused / max 0 | 26,251 → 43h / 0.8°F / 0 unused / max 26,251 |
| Bob Ross 3-18 | 4A | heating | 39,539 / 31.9 MBtu | 38,415 → 0h / 0.2°F / 0 unused / max 38,415 | 44,690 → 0h / 0.0°F / 5,151 unused / max 39,539 | 31,118 → 58h / 3.3°F / 0 unused / max 31,118 |
| Bob Ross 3-18 | 4A | cooling | 26,563 / 37.7 MBtu | 20,965 → 1099h / 2.8°F / 0 unused / max 20,965 | 0 → 4585h / 25.0°F / 0 unused / max 0 | 24,333 → 16h / 0.6°F / 0 unused / max 24,333 |
| Bob Ross 3-19 | 4A | heating | 47,059 / 41.0 MBtu | 43,346 → 4h / 1.0°F / 0 unused / max 43,346 | 50,913 → 0h / 0.0°F / 3,854 unused / max 47,059 | 36,887 → 43h / 3.8°F / 0 unused / max 36,887 |
| Bob Ross 3-19 | 4A | cooling | 28,318 / 37.1 MBtu | 22,579 → 770h / 2.5°F / 0 unused / max 22,579 | 0 → 4243h / 24.0°F / 0 unused / max 0 | 25,699 → 30h / 0.8°F / 0 unused / max 25,699 |
| Bob Ross 3-2 | 4A | heating | 40,039 / 32.6 MBtu | 37,647 → 1h / 0.6°F / 0 unused / max 37,647 | 43,913 → 0h / 0.0°F / 3,874 unused / max 40,039 | 31,978 → 44h / 3.1°F / 0 unused / max 31,978 |
| Bob Ross 3-2 | 4A | cooling | 27,075 / 38.5 MBtu | 21,237 → 1091h / 2.8°F / 0 unused / max 21,237 | 0 → 4582h / 25.1°F / 0 unused / max 0 | 24,483 → 43h / 0.7°F / 0 unused / max 24,483 |
| Bob Ross 3-21 | 4A | heating | 40,673 / 33.2 MBtu | 39,102 → 0h / 0.3°F / 0 unused / max 39,102 | 45,630 → 0h / 0.0°F / 4,957 unused / max 40,673 | 31,991 → 55h / 3.4°F / 0 unused / max 31,991 |
| Bob Ross 3-21 | 4A | cooling | 26,847 / 37.6 MBtu | 21,190 → 1060h / 2.7°F / 0 unused / max 21,190 | 0 → 4560h / 24.9°F / 0 unused / max 0 | 24,550 → 18h / 0.7°F / 0 unused / max 24,550 |
| Bob Ross 3-22 | 4A | heating | 46,881 / 39.6 MBtu | 49,223 → 0h / 0.0°F / 2,342 unused / max 46,881 | 52,841 → 0h / 0.0°F / 5,960 unused / max 46,881 | 37,699 → 28h / 3.1°F / 0 unused / max 37,699 |
| Bob Ross 3-22 | 4A | cooling | 32,179 / 45.8 MBtu | 23,635 → 634h / 3.5°F / 0 unused / max 23,635 | 7,319 → 3497h / 18.4°F / 0 unused / max 7,319 | 29,229 → 17h / 1.0°F / 0 unused / max 29,229 |
| Bob Ross 3-23 | 4A | heating | 34,852 / 31.3 MBtu | 29,338 → 13h / 2.9°F / 0 unused / max 29,338 | 36,760 → 0h / 0.0°F / 1,908 unused / max 34,852 | 27,041 → 26h / 4.5°F / 0 unused / max 27,041 |
| Bob Ross 3-23 | 4A | cooling | 23,333 / 31.6 MBtu | 19,898 → 17h / 1.3°F / 0 unused / max 19,898 | 5,258 → 2858h / 17.0°F / 0 unused / max 5,258 | 21,020 → 2h / 0.7°F / 0 unused / max 21,020 |
| Bob Ross 3-3 | 4A | heating | 39,927 / 31.3 MBtu | 37,647 → 1h / 0.6°F / 0 unused / max 37,647 | 43,883 → 0h / 0.0°F / 3,956 unused / max 39,927 | 31,887 → 51h / 3.1°F / 0 unused / max 31,887 |
| Bob Ross 3-3 | 4A | cooling | 29,599 / 41.5 MBtu | 22,430 → 1270h / 3.4°F / 0 unused / max 22,430 | 1,275 → 4507h / 24.6°F / 0 unused / max 1,275 | 26,700 → 59h / 0.8°F / 0 unused / max 26,700 |
| Bob Ross 3-4 | 4A | heating | 40,219 / 34.6 MBtu | 37,647 → 2h / 0.7°F / 0 unused / max 37,647 | 43,943 → 0h / 0.0°F / 3,724 unused / max 40,219 | 32,121 → 41h / 3.1°F / 0 unused / max 32,121 |
| Bob Ross 3-4 | 4A | cooling | 25,058 / 36.2 MBtu | 20,412 → 787h / 2.3°F / 0 unused / max 20,412 | 0 → 4518h / 23.9°F / 0 unused / max 0 | 22,630 → 50h / 0.8°F / 0 unused / max 22,630 |
| Bob Ross 3-5 | 4A | heating | 39,734 / 29.6 MBtu | 37,647 → 1h / 0.5°F / 0 unused / max 37,647 | 43,798 → 0h / 0.0°F / 4,064 unused / max 39,734 | 31,741 → 51h / 3.1°F / 0 unused / max 31,741 |
| Bob Ross 3-5 | 4A | cooling | 31,760 / 44.9 MBtu | 25,126 → 1086h / 2.8°F / 0 unused / max 25,126 | 4,299 → 4271h / 21.6°F / 0 unused / max 4,299 | 28,653 → 64h / 0.8°F / 0 unused / max 28,653 |
| Bob Ross 3-6 | 4A | heating | 39,320 / 31.8 MBtu | 37,251 → 1h / 0.5°F / 0 unused / max 37,251 | 43,435 → 0h / 0.0°F / 4,115 unused / max 39,320 | 31,328 → 51h / 3.1°F / 0 unused / max 31,328 |
| Bob Ross 3-6 | 4A | cooling | 26,908 / 38.7 MBtu | 21,308 → 1032h / 2.7°F / 0 unused / max 21,308 | 0 → 4597h / 25.2°F / 0 unused / max 0 | 24,346 → 44h / 0.8°F / 0 unused / max 24,346 |
| Bob Ross 3-7 | 4A | heating | 45,159 / 38.4 MBtu | 42,579 → 2h / 0.7°F / 0 unused / max 42,579 | 48,393 → 0h / 0.0°F / 3,234 unused / max 45,159 | 36,745 → 37h / 3.2°F / 0 unused / max 36,745 |
| Bob Ross 3-7 | 4A | cooling | 30,423 / 41.1 MBtu | 24,098 → 985h / 2.6°F / 0 unused / max 24,098 | 3,267 → 4161h / 21.4°F / 0 unused / max 3,267 | 27,441 → 43h / 0.8°F / 0 unused / max 27,441 |
| Bob Ross 3-8 | 4A | heating | 39,858 / 31.9 MBtu | 37,647 → 1h / 0.6°F / 0 unused / max 37,647 | 43,685 → 0h / 0.0°F / 3,827 unused / max 39,858 | 31,977 → 42h / 3.0°F / 0 unused / max 31,977 |
| Bob Ross 3-8 | 4A | cooling | 27,330 / 39.3 MBtu | 21,171 → 1158h / 3.0°F / 0 unused / max 21,171 | 0 → 4606h / 25.4°F / 0 unused / max 0 | 24,472 → 80h / 0.9°F / 0 unused / max 24,472 |
| Bob Ross 3-9 | 4A | heating | 39,724 / 31.4 MBtu | 37,647 → 1h / 0.5°F / 0 unused / max 37,647 | 43,519 → 0h / 0.0°F / 3,795 unused / max 39,724 | 31,977 → 40h / 2.9°F / 0 unused / max 31,977 |
| Bob Ross 3-9 | 4A | cooling | 27,464 / 39.9 MBtu | 21,171 → 1185h / 3.1°F / 0 unused / max 21,171 | 0 → 4638h / 25.6°F / 0 unused / max 0 | 24,472 → 108h / 1.0°F / 0 unused / max 24,472 |
| Bob Ross 4 | 4A | heating | 40,074 / 32.8 MBtu | 37,647 → 2h / 0.7°F / 0 unused / max 37,647 | 43,904 → 0h / 0.0°F / 3,830 unused / max 40,074 | 32,083 → 38h / 3.1°F / 0 unused / max 32,083 |
| Bob Ross 4 | 4A | cooling | 26,369 / 39.9 MBtu | 21,998 → 751h / 2.1°F / 0 unused / max 21,998 | 0 → 4603h / 25.8°F / 0 unused / max 0 | 23,861 → 104h / 0.9°F / 54 unused / max 23,807 |
| Bob Ross 5 | 4A | heating | 41,622 / 32.9 MBtu | 39,328 → 2h / 0.6°F / 0 unused / max 39,328 | 45,554 → 0h / 0.0°F / 3,932 unused / max 41,622 | 33,251 → 40h / 3.3°F / 0 unused / max 33,251 |
| Bob Ross 5 | 4A | cooling | 29,094 / 42.0 MBtu | 23,634 → 996h / 2.6°F / 0 unused / max 23,634 | 3,719 → 4177h / 20.9°F / 0 unused / max 3,719 | 25,990 → 182h / 1.2°F / 66 unused / max 25,924 |
| Bob Ross Residence | 4A | heating | 40,051 / 32.6 MBtu | 37,647 → 1h / 0.6°F / 0 unused / max 37,647 | 43,925 → 0h / 0.0°F / 3,874 unused / max 40,051 | 31,977 → 46h / 3.1°F / 0 unused / max 31,977 |
| Bob Ross Residence | 4A | cooling | 27,137 / 38.5 MBtu | 21,171 → 1119h / 2.9°F / 0 unused / max 21,171 | 0 → 4584h / 25.1°F / 0 unused / max 0 | 24,472 → 54h / 0.8°F / 0 unused / max 24,472 |
| Long Residence | 5A | heating | 48,600 / 76.2 MBtu | 41,746 → 50h / 4.3°F / 0 unused / max 41,746 | 54,989 → 0h / 0.0°F / 6,389 unused / max 48,600 | 40,710 → 85h / 5.3°F / 0 unused / max 40,710 |
| Long Residence | 5A | cooling | 17,948 / 14.0 MBtu | 16,059 → 2h / 0.8°F / 0 unused / max 16,059 | 4,490 → 2508h / 11.9°F / 0 unused / max 4,490 | 18,951 → 0h / 0.0°F / 1,003 unused / max 17,948 |
| Smith Residence | 5A | heating | 57,986 / 95.5 MBtu | 54,653 → 7h / 1.1°F / 0 unused / max 54,653 | 55,300 → 3h / 0.9°F / 0 unused / max 55,300 | 47,490 → 156h / 4.0°F / 0 unused / max 47,490 |
| Smith Residence | 5A | cooling | 18,839 / 11.9 MBtu | 21,369 → 0h / 0.0°F / 2,531 unused / max 18,838 | 5,346 → 1998h / 8.4°F / 0 unused / max 5,346 | 19,184 → 0h / 0.0°F / 371 unused / max 18,813 |
| Victor Residence ×2 | 5A | heating | 52,351 / 76.3 MBtu | 52,493 → 0h / 0.0°F / 142 unused / max 52,351 | 54,975 → 0h / 0.0°F / 2,625 unused / max 52,350 | 46,170 → 20h / 3.6°F / 0 unused / max 46,170 |
| Victor Residence ×2 | 5A | cooling | 21,703 / 14.9 MBtu | 17,567 → 17h / 1.9°F / 0 unused / max 17,567 | 14,381 → 122h / 4.2°F / 0 unused / max 14,381 | 19,377 → 3h / 0.9°F / 0 unused / max 19,377 |
| HVAC2a ×5 | 5B | heating | 35,955 / 52.4 MBtu | 54,901 → 0h / 0.0°F / 18,946 unused / max 35,955 | 42,241 → 0h / 0.0°F / 6,286 unused / max 35,955 | 36,192 → 0h / 0.0°F / 237 unused / max 35,955 |
| HVAC2a ×5 | 5B | cooling | 22,992 / 14.1 MBtu | 23,556 → 0h / 0.0°F / 564 unused / max 22,992 | 19,873 → 14h / 1.8°F / 0 unused / max 19,873 | 21,797 → 1h / 0.6°F / 0 unused / max 21,797 |
| House | Answer | Heating: cap → both referees | Cooling: cap → both referees |
|---|---|---|---|
| Bob Ross Residence | Manual J worksheet | 37,647 → Aris 1h (0.6°F) · E+ 8h (1.5°F) | 21,171 → Aris 1119h (2.9°F) · E+ 1h (0.6°F) |
| Bob Ross Residence | E+ design day ×1.25/1.15 | 43,925 → Aris 0h (0.0°F) · E+ 0h (0.1°F) | 0 → Aris 4584h (25.1°F) · E+ 3681h (20.5°F) |
| Bob Ross Residence | Aris production | 31,977 → Aris 46h (3.1°F) · E+ 36h (3.9°F) | 24,472 → Aris 54h (0.8°F) · E+ 0h (0.0°F) |
| Long Residence | Manual J worksheet | 41,746 → Aris 50h (4.3°F) · E+ 53h (3.6°F) | 16,059 → Aris 2h (0.8°F) · E+ 0h (0.0°F) |
| Long Residence | E+ design day ×1.25/1.15 | 54,989 → Aris 0h (0.0°F) · E+ 0h (0.0°F) | 4,490 → Aris 2508h (11.9°F) · E+ 1612h (8.4°F) |
| Long Residence | Aris production | 40,710 → Aris 85h (5.3°F) · E+ 84h (4.4°F) | 18,951 → Aris 0h (0.0°F) · E+ 0h (0.0°F) |
| Walker Residence | Manual J worksheet | no test | 14,588 → Aris 0h (0.0°F) · E+ 0h (0.0°F) |
| Walker Residence | E+ design day ×1.25/1.15 | no test | 8,494 → Aris 90h (1.9°F) · E+ 65h (1.7°F) |
| Walker Residence | Aris production | no test | 14,306 → Aris 0h (0.0°F) · E+ 0h (0.0°F) |
Second-referee recipe (recorded in full in the cross-check ledger's basis field): the corpus's own ideal-loads IDF with ZoneHVAC:IdealLoadsAirSystem limits set to LimitCapacity at the answer's capacity (heating as sensible W; cooling as the sensible answer divided by the object's constant SHR, because the E+ cooling limit is a total capacity), the RunPeriod left untouched so this referee flies the same 1-year basis as the annual lane rather than a converged-soil one of its own, exceedance counted from hourly zone mean air temperature against the thermostat targets with the same 0.5°F band the Aris arm uses. Known convention differences: hour-average vs end-of-hour temperature, and one conditioned zone vs per-room fixed capacity shares.
| House | Room | MJ htg | Aris htg | Δ htg | MJ clg | Aris clg | Δ clg | AED row |
|---|---|---|---|---|---|---|---|---|
| Walker Ceiling Option 1 | bedroom_1 | 1,089 | 0 | -100.0% | 1,178 | 1,360 | +15.4% | 9 |
| Walker Ceiling Option 1 | bedroom_2 | 1,022 | 138 | -86.5% | 1,121 | 1,281 | +14.3% | 3 |
| Walker Ceiling Option 1 | living_dining | 2,472 | 0 | -100.0% | 5,463 | 5,410 | -1.0% | |
| Walker Ceiling Option 1 | kitchen_utility | 1,595 | 0 | -100.0% | 4,852 | 5,054 | +4.2% | |
| Walker Ceiling Option 2 | bedroom_1 | 1,089 | 0 | -100.0% | 1,116 | 1,298 | +16.3% | 9 |
| Walker Ceiling Option 2 | bedroom_2 | 1,022 | 136 | -86.7% | 1,067 | 1,226 | +14.9% | 3 |
| Walker Ceiling Option 2 | living_dining | 2,472 | 0 | -100.0% | 5,349 | 5,218 | -2.4% | |
| Walker Ceiling Option 2 | kitchen_utility | 1,595 | 0 | -100.0% | 4,779 | 4,944 | +3.5% | |
| Walker Residence | bedroom_1 | 1,089 | 0 | -100.0% | 1,085 | 1,316 | +21.3% | 9 |
| Walker Residence | bedroom_2 | 1,022 | 143 | -86.0% | 1,039 | 1,242 | +19.5% | 3 |
| Walker Residence | living_dining | 2,472 | 0 | -100.0% | 5,291 | 5,243 | -0.9% | |
| Walker Residence | kitchen_utility | 1,595 | 0 | -100.0% | 4,743 | 4,965 | +4.7% | |
| Bell Residence | bedroom_1 | 3,725 | 2,783 | -25.3% | 4,041 | 3,071 | -24.0% | |
| Bell Residence | bedroom_2 | 2,418 | 1,634 | -32.4% | 2,748 | 2,147 | -21.9% | |
| Bell Residence | bedroom_3 | 1,269 | 1,007 | -20.6% | 1,732 | 1,482 | -14.4% | |
| Bell Residence | kitchen_entry | 2,893 | 2,295 | -20.7% | 3,304 | 2,517 | -23.8% | |
| Bell Residence | family_room | 8,554 | 6,216 | -27.3% | 17,740 | 14,922 | -15.9% | |
| Bell Residence | dining | 4,592 | 2,884 | -37.2% | 3,704 | 2,904 | -21.6% | |
| Bob Ross 3-1 | primary_bedroom | 4,133 | 3,713 | -10.2% | 2,909 | 2,900 | -0.3% | 464 |
| Bob Ross 3-1 | primary_bathroom | 1,122 | 1,126 | +0.4% | n/a | n/a | n/a | |
| Bob Ross 3-1 | bedroom_1 | 2,734 | 2,303 | -15.8% | 2,222 | 2,184 | -1.7% | 538 |
| Bob Ross 3-1 | bathroom_1 | 1,101 | 1,213 | +10.2% | n/a | n/a | n/a | |
| Bob Ross 3-1 | family_room | 6,778 | 6,035 | -11.0% | 5,559 | 4,469 | -19.6% | |
| Bob Ross 3-1 | kitchen | 3,556 | 2,418 | -32.0% | 2,682 | 2,191 | -18.3% | |
| Bob Ross 3-1 | foyer | 1,474 | 1,560 | +5.8% | n/a | n/a | n/a | |
| Bob Ross 3-1 | bedroom_2 | 2,132 | 1,676 | -21.4% | n/a | n/a | n/a | |
| Bob Ross 3-1 | bedroom_3 | 2,423 | 1,973 | -18.6% | n/a | n/a | n/a | |
| Bob Ross 3-1 | craft | 1,002 | 886 | -11.6% | n/a | n/a | n/a | |
| Bob Ross 3-1 | utility_room | 1,286 | 916 | -28.8% | n/a | n/a | n/a | |
| Bob Ross 3-1 | recroom | 3,798 | 3,248 | -14.5% | 1,307 | 2,946 | +125.4% | 69 |
| Bob Ross 3-10 | primary_bedroom | 4,569 | 3,912 | -14.4% | 3,324 | 3,207 | -3.5% | 590 |
| Bob Ross 3-10 | primary_bathroom | 1,200 | 1,163 | -3.1% | n/a | n/a | n/a | |
| Bob Ross 3-10 | bedroom_1 | 2,952 | 2,402 | -18.6% | 2,577 | 2,440 | -5.3% | 685 |
| Bob Ross 3-10 | bathroom_1 | 1,178 | 1,249 | +6.0% | n/a | n/a | n/a | |
| Bob Ross 3-10 | family_room | 7,041 | 6,157 | -12.6% | 6,222 | 4,860 | -21.9% | |
| Bob Ross 3-10 | kitchen | 3,691 | 2,474 | -33.0% | 3,082 | 2,557 | -17.0% | |
| Bob Ross 3-10 | foyer | 1,474 | 1,561 | +5.9% | n/a | n/a | n/a | |
| Bob Ross 3-10 | bedroom_2 | 2,286 | 1,750 | -23.4% | 1,010 | 1,951 | +93.2% | 208 |
| Bob Ross 3-10 | bedroom_3 | 2,538 | 2,025 | -20.2% | n/a | n/a | n/a | |
| Bob Ross 3-10 | craft | 1,079 | 924 | -14.4% | n/a | n/a | n/a | |
| Bob Ross 3-10 | utility_room | 1,286 | 913 | -29.0% | n/a | n/a | n/a | |
| Bob Ross 3-10 | recroom | 3,875 | 3,284 | -15.3% | 1,356 | 3,004 | +121.5% | 88 |
| Bob Ross 3-11 | primary_bedroom | 4,570 | 3,855 | -15.6% | 3,323 | 3,202 | -3.6% | 590 |
| Bob Ross 3-11 | primary_bathroom | 1,199 | 1,143 | -4.7% | n/a | n/a | n/a | |
| Bob Ross 3-11 | bedroom_1 | 2,952 | 2,369 | -19.7% | 2,577 | 2,438 | -5.4% | 685 |
| Bob Ross 3-11 | bathroom_1 | 1,178 | 1,230 | +4.4% | n/a | n/a | n/a | |
| Bob Ross 3-11 | family_room | 7,041 | 6,054 | -14.0% | 6,222 | 4,845 | -22.1% | |
| Bob Ross 3-11 | kitchen | 3,692 | 2,440 | -33.9% | 3,082 | 2,554 | -17.1% | |
| Bob Ross 3-11 | foyer | 1,474 | 1,527 | +3.6% | n/a | n/a | n/a | |
| Bob Ross 3-11 | bedroom_2 | 2,285 | 1,711 | -25.1% | 1,010 | 1,947 | +92.8% | 208 |
| Bob Ross 3-11 | bedroom_3 | 2,537 | 1,971 | -22.3% | n/a | n/a | n/a | |
| Bob Ross 3-11 | craft | 1,080 | 899 | -16.8% | n/a | n/a | n/a | |
| Bob Ross 3-11 | utility_room | 1,285 | 891 | -30.7% | n/a | n/a | n/a | |
| Bob Ross 3-11 | recroom | 3,875 | 3,154 | -18.6% | 1,356 | 2,992 | +120.6% | 88 |
| Bob Ross 3-12 | primary_bedroom | 6,141 | 4,779 | -22.2% | 3,599 | 3,288 | -8.6% | 590 |
| Bob Ross 3-12 | primary_bathroom | 1,648 | 1,471 | -10.7% | n/a | n/a | n/a | |
| Bob Ross 3-12 | bedroom_1 | 4,150 | 2,898 | -30.2% | 2,787 | 2,487 | -10.8% | 685 |
| Bob Ross 3-12 | bathroom_1 | 1,628 | 1,533 | -5.8% | n/a | n/a | n/a | |
| Bob Ross 3-12 | family_room | 8,612 | 7,712 | -10.5% | 6,497 | 5,098 | -21.5% | |
| Bob Ross 3-12 | kitchen | 4,477 | 2,984 | -33.3% | 3,219 | 2,617 | -18.7% | |
| Bob Ross 3-12 | foyer | 1,961 | 2,082 | +6.2% | 1,016 | 995 | -2.1% | |
| Bob Ross 3-12 | bedroom_2 | 2,547 | 2,349 | -7.8% | 1,056 | 2,025 | +91.8% | 208 |
| Bob Ross 3-12 | bedroom_3 | 2,845 | 2,845 | 0.0% | n/a | n/a | n/a | |
| Bob Ross 3-12 | craft | 1,192 | 1,308 | +9.7% | n/a | n/a | n/a | |
| Bob Ross 3-12 | utility_room | 1,481 | 1,246 | -15.9% | n/a | n/a | n/a | |
| Bob Ross 3-12 | recroom | 4,137 | 5,265 | +27.3% | 1,402 | 3,316 | +136.5% | 88 |
| Bob Ross 3-13 | primary_bedroom | 6,578 | 4,474 | -32.0% | 3,664 | 3,280 | -10.5% | 590 |
| Bob Ross 3-13 | primary_bathroom | 1,773 | 1,362 | -23.2% | n/a | n/a | n/a | |
| Bob Ross 3-13 | bedroom_1 | 4,482 | 2,724 | -39.2% | 2,837 | 2,483 | -12.5% | 685 |
| Bob Ross 3-13 | bathroom_1 | 1,752 | 1,433 | -18.2% | n/a | n/a | n/a | |
| Bob Ross 3-13 | family_room | 9,049 | 7,160 | -20.9% | 6,562 | 4,989 | -24.0% | |
| Bob Ross 3-13 | kitchen | 4,696 | 2,798 | -40.4% | 3,251 | 2,605 | -19.9% | |
| Bob Ross 3-13 | foyer | 2,096 | 1,898 | -9.4% | 1,036 | 976 | -5.8% | |
| Bob Ross 3-13 | bedroom_2 | 2,620 | 2,138 | -18.4% | 1,067 | 2,010 | +88.4% | 208 |
| Bob Ross 3-13 | bedroom_3 | 2,930 | 2,556 | -12.8% | n/a | n/a | n/a | |
| Bob Ross 3-13 | craft | 1,223 | 1,173 | -4.1% | n/a | n/a | n/a | |
| Bob Ross 3-13 | utility_room | 1,534 | 1,129 | -26.4% | n/a | n/a | n/a | |
| Bob Ross 3-13 | recroom | 4,210 | 4,564 | +8.4% | 1,412 | 3,202 | +126.8% | 88 |
| Bob Ross 3-14 | primary_bedroom | 4,981 | 4,308 | -13.5% | 4,291 | 3,616 | -15.7% | 590 |
| Bob Ross 3-14 | primary_bathroom | 1,345 | 1,304 | -3.0% | n/a | n/a | n/a | |
| Bob Ross 3-14 | bedroom_1 | 3,187 | 2,630 | -17.5% | 3,131 | 2,679 | -14.4% | 685 |
| Bob Ross 3-14 | bathroom_1 | 1,313 | 1,491 | +13.6% | n/a | n/a | n/a | |
| Bob Ross 3-14 | family_room | 7,766 | 6,859 | -11.7% | 7,929 | 5,589 | -29.5% | |
| Bob Ross 3-14 | kitchen | 3,920 | 2,718 | -30.7% | 3,619 | 2,877 | -20.5% | |
| Bob Ross 3-14 | foyer | 1,721 | 1,800 | +4.6% | 1,511 | 1,166 | -22.8% | |
| Bob Ross 3-14 | bedroom_2 | 2,286 | 1,741 | -23.8% | 1,010 | 1,966 | +94.7% | 208 |
| Bob Ross 3-14 | bedroom_3 | 2,537 | 2,012 | -20.7% | n/a | n/a | n/a | |
| Bob Ross 3-14 | craft | 1,080 | 918 | -15.0% | n/a | n/a | n/a | |
| Bob Ross 3-14 | utility_room | 1,286 | 907 | -29.5% | n/a | n/a | n/a | |
| Bob Ross 3-14 | recroom | 3,876 | 3,255 | -16.0% | 1,355 | 3,052 | +125.2% | 88 |
| Bob Ross 3-15 | primary_bedroom | 3,949 | 3,112 | -21.2% | 3,195 | 2,779 | -13.0% | 590 |
| Bob Ross 3-15 | primary_bathroom | 1,011 | 921 | -8.9% | n/a | n/a | n/a | |
| Bob Ross 3-15 | bedroom_1 | 2,455 | 1,779 | -27.5% | 2,474 | 1,994 | -19.4% | 685 |
| Bob Ross 3-15 | family_room | 6,083 | 5,170 | -15.0% | 5,876 | 4,477 | -23.8% | |
| Bob Ross 3-15 | kitchen | 3,105 | 1,859 | -40.1% | 2,856 | 2,282 | -20.1% | |
| Bob Ross 3-15 | foyer | 1,288 | 1,338 | +3.9% | n/a | n/a | n/a | |
| Bob Ross 3-15 | bedroom_2 | 2,286 | 1,719 | -24.8% | 1,010 | 1,943 | +92.4% | 208 |
| Bob Ross 3-15 | bedroom_3 | 2,538 | 1,982 | -21.9% | n/a | n/a | n/a | |
| Bob Ross 3-15 | craft | 1,080 | 904 | -16.3% | n/a | n/a | n/a | |
| Bob Ross 3-15 | utility_room | 1,286 | 896 | -30.3% | n/a | n/a | n/a | |
| Bob Ross 3-15 | recroom | 3,875 | 3,154 | -18.6% | 1,356 | 2,981 | +119.8% | 88 |
| Bob Ross 3-17 | primary_bedroom | 5,131 | 4,432 | -13.6% | 3,415 | 3,333 | -2.4% | 590 |
| Bob Ross 3-17 | primary_bathroom | 1,360 | 1,348 | -0.9% | n/a | n/a | n/a | |
| Bob Ross 3-17 | bedroom_1 | 3,380 | 2,700 | -20.1% | 2,647 | 2,513 | -5.1% | 685 |
| Bob Ross 3-17 | bathroom_1 | 1,338 | 1,420 | +6.1% | n/a | n/a | n/a | |
| Bob Ross 3-17 | family_room | 7,602 | 7,084 | -6.8% | 6,313 | 5,114 | -19.0% | |
| Bob Ross 3-17 | kitchen | 3,972 | 2,772 | -30.2% | 3,127 | 2,642 | -15.5% | |
| Bob Ross 3-17 | foyer | 1,648 | 1,874 | +13.7% | n/a | n/a | n/a | |
| Bob Ross 3-17 | bedroom_2 | 2,379 | 2,110 | -11.3% | 1,025 | 2,054 | +100.4% | 208 |
| Bob Ross 3-17 | bedroom_3 | 2,648 | 2,518 | -4.9% | n/a | n/a | n/a | |
| Bob Ross 3-17 | craft | 1,120 | 1,155 | +3.1% | n/a | n/a | n/a | |
| Bob Ross 3-17 | utility_room | 1,355 | 1,113 | -17.9% | n/a | n/a | n/a | |
| Bob Ross 3-17 | recroom | 3,968 | 4,471 | +12.7% | 1,370 | 3,355 | +144.9% | 88 |
| Bob Ross 3-18 | primary_bedroom | 5,131 | 3,834 | -25.3% | 3,415 | 3,199 | -6.3% | 590 |
| Bob Ross 3-18 | primary_bathroom | 1,360 | 1,136 | -16.5% | n/a | n/a | n/a | |
| Bob Ross 3-18 | bedroom_1 | 3,380 | 2,357 | -30.3% | 2,647 | 2,436 | -8.0% | 685 |
| Bob Ross 3-18 | bathroom_1 | 1,338 | 1,224 | -8.5% | n/a | n/a | n/a | |
| Bob Ross 3-18 | family_room | 7,602 | 6,018 | -20.8% | 6,313 | 4,847 | -23.2% | |
| Bob Ross 3-18 | kitchen | 3,972 | 2,429 | -38.8% | 3,127 | 2,551 | -18.4% | |
| Bob Ross 3-18 | foyer | 1,648 | 1,515 | -8.1% | n/a | n/a | n/a | |
| Bob Ross 3-18 | bedroom_2 | 2,379 | 1,696 | -28.7% | 1,025 | 1,944 | +89.7% | 208 |
| Bob Ross 3-18 | bedroom_3 | 2,648 | 1,952 | -26.3% | n/a | n/a | n/a | |
| Bob Ross 3-18 | craft | 1,120 | 889 | -20.6% | n/a | n/a | n/a | |
| Bob Ross 3-18 | utility_room | 1,355 | 883 | -34.8% | n/a | n/a | n/a | |
| Bob Ross 3-18 | recroom | 3,968 | 3,107 | -21.7% | 1,370 | 2,985 | +117.9% | 88 |
| Bob Ross 3-19 | primary_bedroom | 5,131 | 4,308 | -16.0% | 3,415 | 3,293 | -3.6% | 590 |
| Bob Ross 3-19 | primary_bathroom | 1,360 | 1,304 | -4.1% | n/a | n/a | n/a | |
| Bob Ross 3-19 | bedroom_1 | 3,379 | 2,629 | -22.2% | 2,647 | 2,490 | -5.9% | 685 |
| Bob Ross 3-19 | bathroom_1 | 1,339 | 1,379 | +3.0% | n/a | n/a | n/a | |
| Bob Ross 3-19 | family_room | 7,603 | 6,863 | -9.7% | 6,314 | 5,047 | -20.1% | |
| Bob Ross 3-19 | kitchen | 3,972 | 2,701 | -32.0% | 3,127 | 2,616 | -16.3% | |
| Bob Ross 3-19 | foyer | 1,648 | 1,799 | +9.2% | n/a | n/a | n/a | |
| Bob Ross 3-19 | bedroom_2 | 2,379 | 2,024 | -14.9% | 1,025 | 2,022 | +97.3% | 208 |
| Bob Ross 3-19 | bedroom_3 | 2,648 | 2,400 | -9.4% | n/a | n/a | n/a | |
| Bob Ross 3-19 | craft | 1,120 | 1,100 | -1.8% | n/a | n/a | n/a | |
| Bob Ross 3-19 | utility_room | 1,355 | 1,065 | -21.4% | n/a | n/a | n/a | |
| Bob Ross 3-19 | recroom | 3,969 | 4,188 | +5.5% | 1,370 | 3,252 | +137.4% | 88 |
| Bob Ross 3-2 | primary_bedroom | 4,570 | 3,912 | -14.4% | 3,323 | 3,204 | -3.6% | 590 |
| Bob Ross 3-2 | primary_bathroom | 1,199 | 1,163 | -3.0% | n/a | n/a | n/a | |
| Bob Ross 3-2 | bedroom_1 | 2,952 | 2,402 | -18.6% | 2,577 | 2,441 | -5.3% | 685 |
| Bob Ross 3-2 | bathroom_1 | 1,178 | 1,249 | +6.0% | n/a | n/a | n/a | |
| Bob Ross 3-2 | family_room | 7,041 | 6,157 | -12.6% | 6,222 | 4,853 | -22.0% | |
| Bob Ross 3-2 | kitchen | 3,691 | 2,473 | -33.0% | 3,081 | 2,559 | -16.9% | |
| Bob Ross 3-2 | foyer | 1,474 | 1,561 | +5.9% | n/a | n/a | n/a | |
| Bob Ross 3-2 | bedroom_2 | 2,286 | 1,750 | -23.4% | 1,010 | 1,951 | +93.2% | 208 |
| Bob Ross 3-2 | bedroom_3 | 2,538 | 2,025 | -20.2% | n/a | n/a | n/a | |
| Bob Ross 3-2 | craft | 1,080 | 924 | -14.4% | n/a | n/a | n/a | |
| Bob Ross 3-2 | utility_room | 1,286 | 913 | -29.0% | n/a | n/a | n/a | |
| Bob Ross 3-2 | recroom | 3,875 | 3,284 | -15.3% | 1,394 | 3,030 | +117.4% | 87 |
| Bob Ross 3-20 | primary_bedroom | 5,131 | 4,432 | -13.6% | 3,415 | 3,333 | -2.4% | 590 |
| Bob Ross 3-20 | primary_bathroom | 1,360 | 1,348 | -0.9% | n/a | n/a | n/a | |
| Bob Ross 3-20 | bedroom_1 | 3,380 | 2,700 | -20.1% | 2,647 | 2,513 | -5.1% | 685 |
| Bob Ross 3-20 | bathroom_1 | 1,338 | 1,420 | +6.1% | n/a | n/a | n/a | |
| Bob Ross 3-20 | family_room | 7,602 | 7,084 | -6.8% | 6,313 | 5,114 | -19.0% | |
| Bob Ross 3-20 | kitchen | 3,972 | 2,772 | -30.2% | 3,127 | 2,642 | -15.5% | |
| Bob Ross 3-20 | foyer | 1,648 | 1,874 | +13.7% | n/a | n/a | n/a | |
| Bob Ross 3-20 | bedroom_2 | 2,379 | 2,110 | -11.3% | 1,025 | 2,054 | +100.4% | 208 |
| Bob Ross 3-20 | bedroom_3 | 2,648 | 2,518 | -4.9% | n/a | n/a | n/a | |
| Bob Ross 3-20 | craft | 1,120 | 1,155 | +3.1% | n/a | n/a | n/a | |
| Bob Ross 3-20 | utility_room | 1,355 | 1,113 | -17.9% | n/a | n/a | n/a | |
| Bob Ross 3-20 | recroom | 3,968 | 4,471 | +12.7% | 1,370 | 3,355 | +144.9% | 88 |
| Bob Ross 3-21 | primary_bedroom | 5,131 | 3,906 | -23.9% | 3,415 | 3,214 | -5.9% | 590 |
| Bob Ross 3-21 | primary_bathroom | 1,359 | 1,161 | -14.6% | n/a | n/a | n/a | |
| Bob Ross 3-21 | bedroom_1 | 3,380 | 2,398 | -29.1% | 2,647 | 2,445 | -7.6% | 685 |
| Bob Ross 3-21 | bathroom_1 | 1,338 | 1,247 | -6.8% | n/a | n/a | n/a | |
| Bob Ross 3-21 | family_room | 7,602 | 6,146 | -19.2% | 6,313 | 4,879 | -22.7% | |
| Bob Ross 3-21 | kitchen | 3,972 | 2,470 | -37.8% | 3,128 | 2,562 | -18.1% | |
| Bob Ross 3-21 | foyer | 1,648 | 1,558 | -5.5% | n/a | n/a | n/a | |
| Bob Ross 3-21 | bedroom_2 | 2,380 | 1,746 | -26.6% | 1,026 | 1,956 | +90.6% | 208 |
| Bob Ross 3-21 | bedroom_3 | 2,647 | 2,019 | -23.7% | n/a | n/a | n/a | |
| Bob Ross 3-21 | craft | 1,120 | 921 | -17.8% | n/a | n/a | n/a | |
| Bob Ross 3-21 | utility_room | 1,355 | 910 | -32.8% | n/a | n/a | n/a | |
| Bob Ross 3-21 | recroom | 3,969 | 3,270 | -17.6% | 1,371 | 3,026 | +120.7% | 88 |
| Bob Ross 3-22 | primary_bedroom | 4,570 | 3,956 | -13.4% | 3,324 | 3,280 | -1.3% | 590 |
| Bob Ross 3-22 | primary_bathroom | 1,199 | 1,179 | -1.7% | n/a | n/a | n/a | |
| Bob Ross 3-22 | bedroom_1 | 2,952 | 2,426 | -17.8% | 2,577 | 2,485 | -3.6% | 685 |
| Bob Ross 3-22 | bathroom_1 | 1,178 | 1,264 | +7.3% | n/a | n/a | n/a | |
| Bob Ross 3-22 | family_room | 7,041 | 6,243 | -11.3% | 6,222 | 4,964 | -20.2% | |
| Bob Ross 3-22 | kitchen | 3,691 | 2,507 | -32.1% | 3,081 | 2,597 | -15.7% | |
| Bob Ross 3-22 | foyer | 1,474 | 1,588 | +7.7% | n/a | n/a | n/a | |
| Bob Ross 3-22 | bedroom_2 | 4,355 | 2,779 | -36.2% | 1,481 | 2,837 | +91.6% | 208 |
| Bob Ross 3-22 | bathroom_2 | 1,196 | 850 | -28.9% | n/a | n/a | n/a | |
| Bob Ross 3-22 | bedroom_3 | 5,177 | 3,256 | -37.1% | 1,475 | 3,096 | +109.9% | 37 |
| Bob Ross 3-22 | craft | 1,940 | 1,342 | -30.8% | n/a | n/a | n/a | |
| Bob Ross 3-22 | workshop | 1,688 | 1,052 | -37.7% | n/a | n/a | n/a | |
| Bob Ross 3-22 | utility_room | 3,182 | 1,770 | -44.4% | n/a | n/a | n/a | |
| Bob Ross 3-22 | recroom | 6,482 | 4,100 | -36.7% | 1,671 | 3,730 | +123.2% | 88 |
| Bob Ross 3-23 | primary_bedroom | 5,327 | 4,814 | -9.6% | 3,812 | 4,273 | +12.1% | 590 |
| Bob Ross 3-23 | primary_bathroom | 1,468 | 1,497 | +2.0% | n/a | n/a | n/a | |
| Bob Ross 3-23 | bedroom_1 | 3,387 | 2,918 | -13.8% | 2,859 | 3,086 | +7.9% | 685 |
| Bob Ross 3-23 | bathroom_1 | 1,426 | 1,659 | +16.3% | n/a | n/a | n/a | |
| Bob Ross 3-23 | family_room | 8,392 | 7,795 | -7.1% | 7,092 | 6,509 | -8.2% | |
| Bob Ross 3-23 | kitchen | 4,125 | 3,014 | -26.9% | 3,363 | 3,116 | -7.3% | |
| Bob Ross 3-23 | foyer | 1,929 | 2,135 | +10.7% | 1,223 | 1,576 | +28.9% | |
| Bob Ross 3-3 | primary_bedroom | 4,570 | 3,901 | -14.6% | 3,790 | 4,041 | +6.6% | 737 |
| Bob Ross 3-3 | primary_bathroom | 1,199 | 1,161 | -3.2% | n/a | n/a | n/a | |
| Bob Ross 3-3 | bedroom_1 | 2,952 | 2,395 | -18.9% | 2,983 | 3,178 | +6.5% | 856 |
| Bob Ross 3-3 | bathroom_1 | 1,178 | 1,243 | +5.5% | n/a | n/a | n/a | |
| Bob Ross 3-3 | family_room | 7,041 | 6,154 | -12.6% | 6,222 | 4,876 | -21.6% | |
| Bob Ross 3-3 | kitchen | 3,691 | 2,468 | -33.1% | 3,112 | 2,607 | -16.2% | |
| Bob Ross 3-3 | foyer | 1,474 | 1,560 | +5.8% | n/a | n/a | n/a | |
| Bob Ross 3-3 | bedroom_2 | 2,286 | 1,741 | -23.8% | 1,175 | 2,257 | +92.1% | 260 |
| Bob Ross 3-3 | bedroom_3 | 2,538 | 2,011 | -20.8% | n/a | n/a | n/a | |
| Bob Ross 3-3 | craft | 1,080 | 920 | -14.8% | n/a | n/a | n/a | |
| Bob Ross 3-3 | utility_room | 1,286 | 909 | -29.3% | n/a | n/a | n/a | |
| Bob Ross 3-3 | recroom | 3,875 | 3,267 | -15.7% | 1,409 | 3,058 | +117.0% | 110 |
| Bob Ross 3-4 | primary_bedroom | 4,570 | 3,925 | -14.1% | 2,437 | 2,549 | +4.6% | 30 |
| Bob Ross 3-4 | primary_bathroom | 1,199 | 1,164 | -2.9% | n/a | n/a | n/a | |
| Bob Ross 3-4 | bedroom_1 | 2,952 | 2,414 | -18.2% | 1,690 | 1,766 | +4.5% | 125 |
| Bob Ross 3-4 | bathroom_1 | 1,178 | 1,260 | +7.0% | n/a | n/a | n/a | |
| Bob Ross 3-4 | family_room | 7,041 | 6,161 | -12.5% | 6,222 | 4,848 | -22.1% | |
| Bob Ross 3-4 | kitchen | 3,691 | 2,485 | -32.7% | 3,127 | 2,511 | -19.7% | |
| Bob Ross 3-4 | foyer | 1,474 | 1,563 | +6.0% | n/a | n/a | n/a | |
| Bob Ross 3-4 | bedroom_2 | 2,286 | 1,764 | -22.8% | n/a | n/a | n/a | |
| Bob Ross 3-4 | bedroom_3 | 2,538 | 2,051 | -19.2% | n/a | n/a | n/a | |
| Bob Ross 3-4 | craft | 1,080 | 929 | -14.0% | n/a | n/a | n/a | |
| Bob Ross 3-4 | utility_room | 1,286 | 919 | -28.5% | n/a | n/a | n/a | |
| Bob Ross 3-4 | recroom | 3,875 | 3,314 | -14.5% | 1,311 | 2,976 | +127.0% | 6 |
| Bob Ross 3-5 | primary_bedroom | 4,570 | 3,891 | -14.9% | 4,630 | 4,676 | +1.0% | 764 |
| Bob Ross 3-5 | primary_bathroom | 1,199 | 1,155 | -3.7% | n/a | n/a | n/a | |
| Bob Ross 3-5 | bedroom_1 | 2,952 | 2,388 | -19.1% | 3,649 | 3,733 | +2.3% | 894 |
| Bob Ross 3-5 | bathroom_1 | 1,178 | 1,232 | +4.6% | n/a | n/a | n/a | |
| Bob Ross 3-5 | family_room | 7,041 | 6,168 | -12.4% | 6,530 | 5,022 | -23.1% | |
| Bob Ross 3-5 | kitchen | 3,691 | 2,455 | -33.5% | 3,325 | 2,835 | -14.7% | 61 |
| Bob Ross 3-5 | foyer | 1,474 | 1,560 | +5.8% | n/a | n/a | n/a | |
| Bob Ross 3-5 | bedroom_2 | 2,286 | 1,718 | -24.8% | 1,471 | 2,464 | +67.5% | 270 |
| Bob Ross 3-5 | bedroom_3 | 2,538 | 1,986 | -21.7% | 1,150 | 2,347 | +104.1% | 53 |
| Bob Ross 3-5 | craft | 1,080 | 909 | -15.8% | n/a | n/a | n/a | |
| Bob Ross 3-5 | utility_room | 1,286 | 903 | -29.8% | n/a | n/a | n/a | |
| Bob Ross 3-5 | recroom | 3,875 | 3,239 | -16.4% | 1,513 | 3,182 | +110.3% | 68 |
| Bob Ross 3-6 | primary_bedroom | 4,570 | 3,919 | -14.2% | 3,323 | 3,211 | -3.4% | 590 |
| Bob Ross 3-6 | primary_bathroom | 1,199 | 1,166 | -2.8% | n/a | n/a | n/a | |
| Bob Ross 3-6 | bedroom_1 | 2,952 | 2,406 | -18.5% | 2,576 | 2,443 | -5.2% | 685 |
| Bob Ross 3-6 | bathroom_1 | 1,178 | 1,254 | +6.5% | n/a | n/a | n/a | |
| Bob Ross 3-6 | family_room | 6,843 | 5,875 | -14.1% | 6,278 | 4,794 | -23.6% | |
| Bob Ross 3-6 | kitchen | 3,493 | 2,169 | -37.9% | 3,148 | 2,555 | -18.8% | 1 |
| Bob Ross 3-6 | foyer | 1,474 | 1,566 | +6.2% | n/a | n/a | n/a | |
| Bob Ross 3-6 | bedroom_2 | 2,286 | 1,744 | -23.7% | 1,010 | 1,955 | +93.6% | 208 |
| Bob Ross 3-6 | bedroom_3 | 2,538 | 2,017 | -20.5% | n/a | n/a | n/a | |
| Bob Ross 3-6 | craft | 1,080 | 920 | -14.8% | n/a | n/a | n/a | |
| Bob Ross 3-6 | utility_room | 1,286 | 910 | -29.2% | n/a | n/a | n/a | |
| Bob Ross 3-6 | recroom | 3,875 | 3,265 | -15.7% | 1,356 | 3,014 | +122.3% | 88 |
| Bob Ross 3-7 | primary_bedroom | 4,570 | 3,893 | -14.8% | 3,323 | 3,197 | -3.8% | 590 |
| Bob Ross 3-7 | primary_bathroom | 1,199 | 1,157 | -3.5% | n/a | n/a | n/a | |
| Bob Ross 3-7 | bedroom_1 | 2,952 | 2,391 | -19.0% | 2,576 | 2,435 | -5.5% | 685 |
| Bob Ross 3-7 | bathroom_1 | 1,178 | 1,238 | +5.1% | n/a | n/a | n/a | |
| Bob Ross 3-7 | family_room | 9,506 | 8,412 | -11.5% | 7,686 | 6,610 | -14.0% | |
| Bob Ross 3-7 | kitchen | 6,157 | 4,731 | -23.2% | 4,545 | 4,454 | -2.0% | |
| Bob Ross 3-7 | foyer | 1,474 | 1,550 | +5.2% | n/a | n/a | n/a | |
| Bob Ross 3-7 | bedroom_2 | 2,286 | 1,770 | -22.6% | 1,010 | 1,960 | +94.1% | 208 |
| Bob Ross 3-7 | bedroom_3 | 2,538 | 2,052 | -19.1% | n/a | n/a | n/a | |
| Bob Ross 3-7 | craft | 1,080 | 937 | -13.2% | n/a | n/a | n/a | |
| Bob Ross 3-7 | utility_room | 1,286 | 923 | -28.2% | n/a | n/a | n/a | |
| Bob Ross 3-7 | recroom | 3,875 | 3,351 | -13.5% | 1,356 | 3,035 | +123.8% | 88 |
| Bob Ross 3-8 | primary_bedroom | 4,570 | 3,912 | -14.4% | 3,323 | 3,207 | -3.5% | 590 |
| Bob Ross 3-8 | primary_bathroom | 1,199 | 1,163 | -3.0% | n/a | n/a | n/a | |
| Bob Ross 3-8 | bedroom_1 | 2,952 | 2,402 | -18.6% | 2,576 | 2,440 | -5.3% | 685 |
| Bob Ross 3-8 | bathroom_1 | 1,178 | 1,249 | +6.0% | n/a | n/a | n/a | |
| Bob Ross 3-8 | family_room | 7,040 | 6,157 | -12.5% | 6,222 | 4,860 | -21.9% | |
| Bob Ross 3-8 | kitchen | 3,691 | 2,474 | -33.0% | 3,081 | 2,557 | -17.0% | |
| Bob Ross 3-8 | foyer | 1,474 | 1,561 | +5.9% | n/a | n/a | n/a | |
| Bob Ross 3-8 | bedroom_2 | 2,286 | 1,750 | -23.4% | 1,011 | 1,951 | +93.0% | 208 |
| Bob Ross 3-8 | bedroom_3 | 2,538 | 2,025 | -20.2% | n/a | n/a | n/a | |
| Bob Ross 3-8 | craft | 1,080 | 924 | -14.4% | n/a | n/a | n/a | |
| Bob Ross 3-8 | utility_room | 1,286 | 913 | -29.0% | n/a | n/a | n/a | |
| Bob Ross 3-8 | recroom | 3,875 | 3,284 | -15.3% | 1,355 | 3,004 | +121.7% | 88 |
| Bob Ross 3-9 | primary_bedroom | 4,569 | 3,912 | -14.4% | 3,323 | 3,207 | -3.5% | 590 |
| Bob Ross 3-9 | primary_bathroom | 1,200 | 1,163 | -3.1% | n/a | n/a | n/a | |
| Bob Ross 3-9 | bedroom_1 | 2,952 | 2,402 | -18.6% | 2,577 | 2,440 | -5.3% | 685 |
| Bob Ross 3-9 | bathroom_1 | 1,178 | 1,249 | +6.0% | n/a | n/a | n/a | |
| Bob Ross 3-9 | family_room | 7,041 | 6,157 | -12.6% | 6,222 | 4,860 | -21.9% | |
| Bob Ross 3-9 | kitchen | 3,691 | 2,474 | -33.0% | 3,081 | 2,557 | -17.0% | |
| Bob Ross 3-9 | foyer | 1,474 | 1,561 | +5.9% | n/a | n/a | n/a | |
| Bob Ross 3-9 | bedroom_2 | 2,286 | 1,750 | -23.4% | 1,010 | 1,951 | +93.2% | 208 |
| Bob Ross 3-9 | bedroom_3 | 2,538 | 2,025 | -20.2% | n/a | n/a | n/a | |
| Bob Ross 3-9 | craft | 1,079 | 924 | -14.4% | n/a | n/a | n/a | |
| Bob Ross 3-9 | utility_room | 1,285 | 913 | -28.9% | n/a | n/a | n/a | |
| Bob Ross 3-9 | recroom | 3,875 | 3,284 | -15.3% | 1,355 | 3,004 | +121.7% | 88 |
| Bob Ross 4 | primary_bedroom | 4,570 | 3,922 | -14.2% | 3,096 | 2,441 | -21.2% | 362 |
| Bob Ross 4 | primary_bathroom | 1,199 | 1,136 | -5.3% | 1,047 | 759 | -27.5% | 227 |
| Bob Ross 4 | bedroom_1 | 2,952 | 2,499 | -15.3% | 1,293 | 1,351 | +4.5% | |
| Bob Ross 4 | bathroom_1 | 1,178 | 1,293 | +9.8% | 1,036 | 1,136 | +9.7% | 242 |
| Bob Ross 4 | family_room | 7,041 | 6,036 | -14.3% | 6,552 | 5,317 | -18.8% | |
| Bob Ross 4 | kitchen | 3,691 | 2,551 | -30.9% | 3,613 | 2,904 | -19.6% | 228 |
| Bob Ross 4 | foyer | 1,474 | 1,604 | +8.8% | n/a | n/a | n/a | |
| Bob Ross 4 | bedroom_2 | 2,286 | 1,748 | -23.5% | n/a | n/a | n/a | |
| Bob Ross 4 | bedroom_3 | 2,538 | 2,048 | -19.3% | 1,091 | 2,262 | +107.3% | 225 |
| Bob Ross 4 | craft | 1,080 | 921 | -14.7% | n/a | n/a | n/a | |
| Bob Ross 4 | utility_room | 1,286 | 918 | -28.6% | n/a | n/a | n/a | |
| Bob Ross 4 | recroom | 3,875 | 3,309 | -14.6% | 1,714 | 3,387 | +97.6% | 242 |
| Bob Ross 5 | primary_bedroom | 4,570 | 3,925 | -14.1% | 3,095 | 2,450 | -20.8% | 362 |
| Bob Ross 5 | primary_bathroom | 1,199 | 1,137 | -5.2% | 1,047 | 761 | -27.3% | 227 |
| Bob Ross 5 | bedroom_1 | 2,952 | 2,501 | -15.3% | 1,293 | 1,361 | +5.3% | |
| Bob Ross 5 | bathroom_1 | 1,436 | 1,442 | +0.4% | 1,595 | 1,612 | +1.1% | 483 |
| Bob Ross 5 | family_room | 7,729 | 6,408 | -17.1% | 7,115 | 5,897 | -17.1% | 108 |
| Bob Ross 5 | kitchen | 3,949 | 2,699 | -31.7% | 4,197 | 3,278 | -21.9% | 559 |
| Bob Ross 5 | foyer | 1,474 | 1,606 | +9.0% | n/a | n/a | n/a | |
| Bob Ross 5 | bedroom_2 | 2,286 | 1,744 | -23.7% | n/a | n/a | n/a | |
| Bob Ross 5 | bedroom_3 | 2,776 | 2,215 | -20.2% | 1,639 | 2,747 | +67.6% | 467 |
| Bob Ross 5 | craft | 1,080 | 919 | -14.9% | n/a | n/a | n/a | |
| Bob Ross 5 | utility_room | 1,286 | 915 | -28.8% | n/a | n/a | n/a | |
| Bob Ross 5 | recroom | 4,113 | 3,473 | -15.6% | 2,262 | 3,825 | +69.1% | 483 |
| Bob Ross Residence | primary_bedroom | 4,570 | 3,912 | -14.4% | 3,323 | 3,207 | -3.5% | 590 |
| Bob Ross Residence | primary_bathroom | 1,199 | 1,163 | -3.0% | n/a | n/a | n/a | |
| Bob Ross Residence | bedroom_1 | 2,952 | 2,402 | -18.6% | 2,577 | 2,440 | -5.3% | 685 |
| Bob Ross Residence | bathroom_1 | 1,178 | 1,249 | +6.0% | n/a | n/a | n/a | |
| Bob Ross Residence | family_room | 7,041 | 6,157 | -12.6% | 6,222 | 4,860 | -21.9% | |
| Bob Ross Residence | kitchen | 3,691 | 2,474 | -33.0% | 3,081 | 2,557 | -17.0% | |
| Bob Ross Residence | foyer | 1,474 | 1,561 | +5.9% | n/a | n/a | n/a | |
| Bob Ross Residence | bedroom_2 | 2,286 | 1,750 | -23.4% | 1,010 | 1,951 | +93.2% | 208 |
| Bob Ross Residence | bedroom_3 | 2,538 | 2,025 | -20.2% | n/a | n/a | n/a | |
| Bob Ross Residence | craft | 1,080 | 924 | -14.4% | n/a | n/a | n/a | |
| Bob Ross Residence | utility_room | 1,286 | 913 | -29.0% | n/a | n/a | n/a | |
| Bob Ross Residence | recroom | 3,875 | 3,284 | -15.3% | 1,356 | 3,004 | +121.5% | 88 |
| Long Residence | laundry | 2,230 | 1,640 | -26.5% | 1,033 | 805 | -22.1% | |
| Long Residence | kitchen | 1,824 | 1,455 | -20.2% | 2,078 | 1,686 | -18.9% | 284 |
| Long Residence | bathroom_1 | 1,457 | 1,924 | +32.1% | n/a | n/a | n/a | |
| Long Residence | bedroom_3 | 2,084 | 1,803 | -13.5% | 1,695 | 1,558 | -8.1% | 568 |
| Long Residence | bedroom_2 | 3,666 | 2,777 | -24.2% | 1,580 | 1,523 | -3.6% | 194 |
| Long Residence | dining_room | 3,406 | 2,532 | -25.7% | n/a | n/a | n/a | |
| Long Residence | living_room | 4,358 | 4,134 | -5.1% | 4,573 | 4,251 | -7.0% | 1,437 |
| Long Residence | hall_1 | 1,529 | 1,539 | +0.7% | n/a | n/a | n/a | |
| Long Residence | bedroom_1 | 4,756 | 3,738 | -21.4% | 2,325 | 2,661 | +14.5% | 461 |
| Long Residence | recroom | 8,127 | 10,338 | +27.2% | 2,501 | 4,134 | +65.3% | 64 |
| Long Residence | workshop | 3,608 | 4,671 | +29.5% | n/a | n/a | n/a | |
| Long Residence | utility_room | 3,269 | 4,304 | +31.7% | n/a | n/a | n/a | |
| Smith Residence | bedroom_1 | 4,846 | 4,182 | -13.7% | 1,504 | 1,663 | +10.6% | 68 |
| Smith Residence | bedroom_2 | 4,513 | 3,803 | -15.7% | 1,388 | 1,517 | +9.3% | 117 |
| Smith Residence | bedroom_3 | 2,645 | 3,014 | +14.0% | 1,019 | 1,307 | +28.3% | 187 |
| Smith Residence | bathroom_1 | 1,458 | 1,508 | +3.4% | n/a | n/a | n/a | |
| Smith Residence | entry | 1,339 | 1,443 | +7.8% | n/a | n/a | n/a | |
| Smith Residence | living_dining | 9,409 | 8,807 | -6.4% | 6,325 | 5,518 | -12.8% | 515 |
| Smith Residence | kitchen_stairwell | 6,380 | 5,654 | -11.4% | 3,527 | 3,397 | -3.7% | 89 |
| Smith Residence | workshop | 3,277 | 4,466 | +36.3% | n/a | n/a | n/a | |
| Smith Residence | recroom | 14,675 | 10,016 | -31.7% | 7,673 | 5,450 | -29.0% | 2,090 |
| Smith Residence | laundry_equipment | 2,615 | 3,252 | +24.4% | n/a | n/a | n/a |
Per-space run: the Aris side imports the HPXML with singleRoom: false so <Spaces> become individual rooms, a different import configuration from every committed whole-house ledger. The whole-house totals recorded here move slightly against the physics ledger and are NOT a decomposition of those numbers. The gold side is OS-HPXML’s own per-space worksheet (results_design_load_details.csv), Ducts row subtracted, at the fixtures’ native Manual J design temperatures, the same anchors the Aris sizing run uses on this corpus. Declared gaps (13 of 44 cases):
Provenance: the exceedance counts, flat-cap runs, and room-divergence runs are solver output and carry the engine code hash 5e73f7ac76bc… in their recorded ledgers; the E+ cross-check pins the exact base IDF and EPW per flagship. The flat cap is an opt-in delivered-energy ceiling on the ideal-loads thermostat, proven byte-identical to the unclamped solver when off. Houses that need no equipment for a mode read "no test" (4 house-modes, all heating in zone 1A) instead of scoring a fake zero, and identical variants collapse to one ×N row.
Second question · all 8,760 hours
Annual energy is where the two models differ most, and it is measured against each house's own year. The median house differs from EnergyPlus by 0.4 MBtu of heating; the signed median difference is +0.3 MBtu. Cooling differs by 1.1 MBtu.
Basement-heavy variants stretch toward a fifth of their year, and they are where the open work is. A few hot-climate rows have almost no heating year, just one cold snap, so a percentage there would divide two near-zero numbers into a headline; those rows carry their absolute gap instead of a bar. A model can pass the peak and miss the year.
The ground is where this comparison is least settled. A simulator has to guess its starting soil temperature, and soil forgets slowly. A one-year founded EnergyPlus run carries a large, sign-sensitive Kiva startup distortion, so the adopted v7 oracle reports the final year of a calendar-safe 29-year prefix instead. That removes the known first-year bias but does not make the ground converged: 6 of 36 founded cases pass every registered 28→29 convergence channel, and 30 are capped without convergence. Read those ground-coupled rows as a long-history comparison with a disclosed residual transient, not as a converged account of the earth under a house.
| House | Zone | Aris htg peak | E+ htg peak (Δ) | Htg energy ours / E+ (Δ) | Aris clg peak | E+ clg peak (Δ) | Clg energy ours / E+ (Δ) | Aris sizing peak htg / clg |
|---|---|---|---|---|---|---|---|---|
| HVAC1a * | 3B | 22,366 | 22,275 (+0.4%) | 16.0 / 15.8 (+1.7%) | 32,978 | 33,396 (-1.3%) | 52.6 / 52.4 (+0.3%) | 19,497 / 32,945 |
| Bell Residence | 3A | 18,343 | 19,114 (-4.0%) | 19.6 / 20.4 (-3.8%) | 25,064 | 25,071 (-0.0%) | 33.4 / 33.2 (+0.8%) | 16,885 / 27,442 |
| Bob Ross Residence | 4A | 40,051 | 39,876 (+0.4%) | 32.6 / 32.1 (+1.4%) | 27,137 | 26,739 (+1.5%) | 38.5 / 39.6 (-2.8%) | 31,977 / 24,472 |
| Walker Residence | 1A | 1,418 | 1,160 (+22.2% · near-zero ref) | 0.0 / 0.0 (+37.5%) | 11,268 | 11,482 (-1.9%) | 36.0 / 37.7 (-4.5%) | 2,872 / 14,306 |
| Smith Residence | 5A | 57,986 | 54,275 (+6.8%) | 95.5 / 87.6 (+9.0%) | 18,839 | 18,763 (+0.4%) | 11.9 / 11.7 (+1.9%) | 47,490 / 19,184 |
| Victor Residence | 5A | 52,351 | 52,545 (-0.4%) | 76.3 / 76.2 (+0.1%) | 21,703 | 22,401 (-3.1%) | 15.0 / 15.8 (-5.3%) | 46,170 / 19,377 |
| HVAC1b * | 3B | 22,366 | 22,275 (+0.4%) | 16.0 / 15.8 (+1.7%) | 32,978 | 33,396 (-1.3%) | 52.6 / 52.4 (+0.3%) | 19,497 / 32,945 |
| HVAC2a * | 5B | 35,955 | 35,786 (+0.5%) | 52.4 / 52.1 (+0.5%) | 22,992 | 24,188 (-4.9%) | 14.1 / 14.0 (+1.2%) | 36,192 / 21,797 |
| HVAC2b * | 5B | 35,955 | 35,786 (+0.5%) | 52.4 / 52.1 (+0.5%) | 22,992 | 24,188 (-4.9%) | 14.1 / 14.0 (+1.2%) | 36,192 / 21,797 |
| HVAC2c * | 5B | 35,955 | 35,786 (+0.5%) | 52.4 / 52.1 (+0.5%) | 22,992 | 24,188 (-4.9%) | 14.1 / 14.0 (+1.2%) | 36,192 / 21,797 |
| HVAC2d * | 5B | 35,955 | 35,786 (+0.5%) | 52.4 / 52.1 (+0.5%) | 22,992 | 24,188 (-4.9%) | 14.1 / 14.0 (+1.2%) | 36,192 / 21,797 |
| HVAC2e * | 5B | 35,955 | 35,786 (+0.5%) | 52.4 / 52.1 (+0.5%) | 22,992 | 24,188 (-4.9%) | 14.1 / 14.0 (+1.2%) | 36,192 / 21,797 |
| Bob Ross 3-1 | 4A | 38,879 | 38,719 (+0.4%) | 31.9 / 31.5 (+1.3%) | 25,402 | 25,187 (+0.9%) | 36.5 / 37.7 (-3.0%) | 31,110 / 22,851 |
| Bob Ross 3-2 | 4A | 40,039 | 39,866 (+0.4%) | 32.6 / 32.1 (+1.4%) | 27,075 | 26,697 (+1.4%) | 38.5 / 39.6 (-2.8%) | 31,978 / 24,483 |
| Bob Ross 3-3 | 4A | 39,927 | 39,696 (+0.6%) | 31.3 / 30.8 (+1.7%) | 29,599 | 29,174 (+1.5%) | 41.5 / 42.7 (-2.7%) | 31,887 / 26,700 |
| Bob Ross 3-4 | 4A | 40,219 | 40,122 (+0.2%) | 34.7 / 34.2 (+1.2%) | 25,058 | 24,691 (+1.5%) | 36.2 / 37.3 (-2.9%) | 32,121 / 22,630 |
| Bob Ross 3-5 | 4A | 39,734 | 39,434 (+0.8%) | 29.6 / 29.0 (+2.2%) | 31,760 | 31,314 (+1.4%) | 44.9 / 46.3 (-3.0%) | 31,741 / 28,653 |
| Bob Ross 3-6 | 4A | 39,320 | 39,143 (+0.5%) | 31.8 / 31.3 (+1.5%) | 26,908 | 26,457 (+1.7%) | 38.7 / 39.7 (-2.7%) | 31,328 / 24,346 |
| Bob Ross 3-7 | 4A | 45,159 | 44,849 (+0.7%) | 38.4 / 37.6 (+2.1%) | 30,423 | 29,831 (+2.0%) | 41.1 / 41.8 (-1.7%) | 36,745 / 27,441 |
| Bob Ross 3-8 | 4A | 39,858 | 39,682 (+0.4%) | 31.9 / 31.4 (+1.5%) | 27,330 | 26,932 (+1.5%) | 39.3 / 40.4 (-2.7%) | 31,977 / 24,472 |
| Bob Ross 3-9 | 4A | 39,724 | 39,548 (+0.4%) | 31.4 / 31.0 (+1.5%) | 27,464 | 27,066 (+1.5%) | 39.9 / 41.0 (-2.6%) | 31,977 / 24,472 |
| Bob Ross 3-10 | 4A | 40,056 | 39,881 (+0.4%) | 32.6 / 32.2 (+1.4%) | 27,132 | 26,734 (+1.5%) | 38.5 / 39.6 (-2.8%) | 31,977 / 24,472 |
| Bob Ross 3-11 | 4A | 38,852 | 38,677 (+0.5%) | 31.7 / 31.2 (+1.5%) | 27,037 | 26,639 (+1.5%) | 38.7 / 39.8 (-2.7%) | 31,216 / 24,392 |
| Bob Ross 3-12 | 4A | 57,199 | 56,998 (+0.4%) | 45.1 / 44.8 (+0.9%) | 29,393 | 28,975 (+1.4%) | 38.6 / 39.7 (-2.9%) | 43,410 / 25,844 |
| Bob Ross 3-13 | 4A | 42,811 | 42,637 (+0.4%) | 35.2 / 34.8 (+1.2%) | 27,767 | 27,362 (+1.5%) | 38.6 / 39.7 (-2.8%) | 38,591 / 25,489 |
| Bob Ross 3-14 | 4A | 41,658 | 41,336 (+0.8%) | 33.7 / 33.1 (+1.6%) | 29,880 | 29,324 (+1.9%) | 41.9 / 42.8 (-2.3%) | 34,080 / 27,030 |
| Bob Ross 3-15 | 4A | 34,754 | 34,862 (-0.3%) | 28.4 / 28.3 (+0.2%) | 23,443 | 23,745 (-1.3%) | 36.9 / 38.0 (-3.0%) | 27,728 / 22,638 |
| Bob Ross 3-16 | 4A | 31,668 | 31,673 (-0.0%) | 27.7 / 28.2 (-1.9%) | 21,929 | 21,708 (+1.0%) | 30.0 / 30.1 (-0.4%) | 31,815 / 20,368 |
| Bob Ross 3-17 | 4A | 47,874 | 47,702 (+0.4%) | 42.9 / 42.5 (+0.9%) | 29,372 | 28,926 (+1.5%) | 38.3 / 39.4 (-2.9%) | 38,209 / 26,251 |
| Bob Ross 3-18 | 4A | 39,539 | 39,535 (+0.0%) | 31.9 / 32.1 (-0.5%) | 26,563 | 26,030 (+2.0%) | 37.7 / 38.1 (-1.0%) | 31,118 / 24,333 |
| Bob Ross 3-19 | 4A | 47,059 | 47,019 (+0.1%) | 41.0 / 41.1 (-0.2%) | 28,318 | 27,800 (+1.9%) | 37.1 / 37.8 (-1.8%) | 36,887 / 25,699 |
| Bob Ross 3-20 | 4A | 47,874 | 47,702 (+0.4%) | 42.9 / 42.5 (+0.9%) | 29,372 | 28,926 (+1.5%) | 38.3 / 39.4 (-2.9%) | 38,209 / 26,251 |
| Bob Ross 3-21 | 4A | 40,673 | 40,668 (+0.0%) | 33.2 / 33.4 (-0.6%) | 26,847 | 26,308 (+2.0%) | 37.6 / 38.1 (-1.1%) | 31,991 / 24,550 |
| Bob Ross 3-22 | 4A | 46,881 | 48,832 (-4.0%) | 39.6 / 41.2 (-4.0%) | 32,179 | 34,133 (-5.7%) | 45.7 / 49.1 (-6.8%) | 37,699 / 29,229 |
| Bob Ross 3-23 | 4A | 34,852 | 34,724 (+0.4%) | 31.3 / 31.3 (-0.2%) | 23,333 | 24,440 (-4.5%) | 31.6 / 35.5 (-11.0%) | 27,041 / 21,020 |
| Bob Ross 4 | 4A | 40,074 | 39,931 (+0.4%) | 32.8 / 32.5 (+1.0%) | 26,369 | 25,939 (+1.7%) | 39.9 / 41.0 (-2.8%) | 32,083 / 23,861 |
| Bob Ross 5 | 4A | 41,622 | 41,465 (+0.4%) | 32.9 / 32.5 (+1.4%) | 29,094 | 28,689 (+1.4%) | 42.0 / 43.3 (-3.0%) | 33,251 / 25,990 |
| Cobb Residence | 1A | 0 | 0 (ref 0) | 0.0 / 0.0 (ref 0) | 12,782 | 13,835 (-7.6%) | 27.7 / 28.8 (-3.9%) | 0 / 15,576 |
| Long Residence | 5A | 48,600 | 49,277 (-1.4%) | 76.2 / 77.3 (-1.4%) | 17,948 | 17,808 (+0.8%) | 14.0 / 14.1 (-0.7%) | 40,710 / 18,951 |
| Vatilo Residence | 2A | 11,782 | 11,726 (+0.5%) | 4.7 / 4.6 (+3.5%) | 17,388 | 17,466 (-0.4%) | 30.9 / 31.6 (-2.0%) | 9,123 / 16,461 |
| Vatilo Improved Ducts | 2A | 11,782 | 11,726 (+0.5%) | 4.7 / 4.6 (+3.5%) | 17,388 | 17,466 (-0.4%) | 30.9 / 31.6 (-2.0%) | 9,123 / 16,461 |
| Victor Improved Ducts | 5A | 52,351 | 52,545 (-0.4%) | 76.3 / 76.2 (+0.1%) | 21,703 | 22,401 (-3.1%) | 15.0 / 15.8 (-5.3%) | 46,170 / 19,377 |
| Walker Ceiling Option 1 | 1A | 1,408 | 1,159 (+21.4% · near-zero ref) | 0.0 / 0.0 (+36.4%) | 11,720 | 11,900 (-1.5%) | 36.8 / 38.4 (-4.1%) | 2,859 / 14,822 |
| Walker Ceiling Option 2 | 1A | 1,344 | 1,085 (+23.9% · near-zero ref) | 0.0 / 0.0 (+39.3%) | 11,330 | 11,517 (-1.6%) | 36.0 / 37.6 (-4.3%) | 2,782 / 14,144 |
* no per-component reference worksheet ships for this house. The peak and energy columns are one comparison on one basis: the native annual lane, both sides over the same 8,760 hours. Hover any EnergyPlus peak cell for the hour each model peaked on; hover an energy cell for how many hours each side was conditioning. “near-zero ref” marks a reference below 3,000 Btu/h, where a percentage is an artifact of the denominator; “(ref 0)” marks a reference of exactly zero. The last column is a different quantity: the shipped Aris design load from production sizing, which carries the design-day snap and the occupancy floor and is what the Manual J worksheet comparison above is measured against. It is printed for reference and should not be compared with an EnergyPlus column.
All thresholds in this chapter are self-imposed. ACCA publishes no software acceptance criteria analogous to ASHRAE Standard 140 Annex A3, and ACCA recognition ("Powered by Manual J") is a licensing program Aris has not entered. The per-component diagnostic tolerance is our own evidence bar, not a published one.
Aris follows the Manual J 8th-edition procedure and compares its arithmetic against the reference worksheets shipped with OS-HPXML (BSD-3). This is not an ACCA certification, approval, or compliance claim. ACCA®, Manual J®, and Manual D® are registered trademarks of the Air Conditioning Contractors of America, used here nominatively to identify the procedure being followed.
Test homes and their reference worksheets come from a fixed OpenStudio-HPXML export, hashed file by file, with each home's HPXML digest recorded per case in the raw chapter JSON. Pinning the export rather than tracking the upstream checkout is deliberate: the homes a result was measured on must not change because a dependency moved. The whole-house component table is read from OpenStudio-HPXML revision 502811cdfa5c, SHA-256 67311a7a985ef21b…. Physics reference: EnergyPlus 25.2.0-cf7368216c ideal-loads exports of the same homes.
Each result is tied to the engine version and test inputs used to measure it. The downloadable records provide the measurements and identifiers needed to trace the comparisons.
A rating can do more than describe the home we built. It can help us decide which home to build.
Insulation, windows, foundation details, and air sealing are decisions made early, while alternatives are still practical and inexpensive. Our goal is to make high-fidelity rating estimates fast and essentially free to explore, so energy performance becomes part of the design discussion. A final rating documents the outcome; an early estimate can help improve it.
The Energy Rating Index (ERI) compares a home’s modeled energy performance with a standardized reference home. ANSI/RESNET/ICC 301 defines the reference, operating assumptions, and adjustments used to calculate the score. Lower scores indicate better performance under that calculation; the index does not directly measure annual energy consumption or utility bills.
That makes a rating procedural physics: the engine simulates the building, while the standard defines the comparison. Useful design guidance needs to track the score the same home would ultimately receive. This chapter checks that fidelity through RESNET’s published software tests and home-by-home comparisons against our benchmark, OpenStudio-ERI.
RESNET standard
Publication 002 is RESNET's own software test for rating engines, and its bands are published: every criterion below was set by the standard's authors, not by us. A pass means one value matches its published criterion and nothing more; this technical result is not RESNET accreditation.
220 / 220 measured checks inside published bands.
Measured 2026-10-09. The 14 test homes cover two climates; each water heater runs with its own home’s indoor temperatures and operation.
| Case / comparison | Talos | RESNET interval | Within band |
|---|---|---|---|
| L100AD-HW-01 | 19.50 | 19.34–19.88 | In |
| L100AD-HW-02 | 25.96 | 25.76–26.55 | In |
| L100AD-HW-03 | 17.41 | 17.20–17.70 | In |
| L100AD-HW-04 | 25.14 | 24.94–25.71 | In |
| L100AD-HW-05 | 56.36 | 55.93–57.58 | In |
| L100AD-HW-06 | 22.78 | 22.61–23.28 | In |
| L100AD-HW-07 | 20.66 | 20.51–21.09 | In |
| L100AM-HW-01 | 11.04 | 10.74–11.24 | In |
| L100AM-HW-02 | 13.58 | 13.37–13.87 | In |
| L100AM-HW-03 | 9.09 | 8.83–9.33 | In |
| L100AM-HW-04 | 13.27 | 13.06–13.56 | In |
| L100AM-HW-05 | 31.11 | 30.84–31.55 | In |
| L100AM-HW-06 | 12.31 | 12.09–12.59 | In |
| L100AM-HW-07 | 12.06 | 11.84–12.34 | In |
| MN (1-2 delta) | -6.46 | -6.77–-6.27 | In |
| MN (1-3 delta) | 2.09 | 1.92–2.42 | In |
| MN (2-4 delta) | 0.82 | 0.58–1.08 | In |
| MN (2-5 delta) | -30.40 | -31.03–-30.17 | In |
| MN (2-6 delta) | 3.18 | 2.95–3.45 | In |
| MN (2-7 delta) | 5.30 | 5.09–5.59 | In |
| FL (1-2 delta) | -2.54 | -2.88–-2.38 | In |
| FL (1-3 delta) | 1.95 | 1.67–2.17 | In |
| FL (2-4 delta) | 0.31 | 0.07–0.57 | In |
| FL (2-5 delta) | -17.53 | -17.82–-17.32 | In |
| FL (2-6 delta) | 1.27 | 1.04–1.54 | In |
| FL (2-7 delta) | 1.52 | 1.28–1.78 | In |
| MN-FL (01) | 8.46 | 8.37–8.87 | In |
| MN-FL (02) | 12.38 | 12.26–12.77 | In |
| MN-FL (03) | 8.32 | 8.13–8.63 | In |
| MN-FL (04) | 11.87 | 11.75–12.25 | In |
| MN-FL (05) | 25.25 | 25.05–26.04 | In |
| MN-FL (06) | 10.47 | 10.35–10.85 | In |
| MN-FL (07) | 8.60 | 8.46–8.96 | In |
Loads measured 2026-10-09. These absolute loads and case-to-case differences use the same measured year as the acceptance-band comparison above.
| Row | Mode | Aris, MBtu/y | Published band | Verdict |
|---|---|---|---|---|
| 26 absolute annual loads | ||||
| L100AC | heating | 51.59 | 48.07 to 61.35 | In |
| L110AC | heating | 77.26 | 74.30 to 82.96 | In |
| L120AC | heating | 39.86 | 35.98 to 48.09 | In |
| L130AC | heating | 43.93 | 39.74 to 49.95 | In |
| L140AC | heating | 47.91 | 45.72 to 51.97 | In |
| L150AC | heating | 41.20 | 39.13 to 55.54 | In |
| L155AC | heating | 44.45 | 42.17 to 58.15 | In |
| L160AC | heating | 52.37 | 48.30 to 63.40 | In |
| L170AC | heating | 62.15 | 58.15 to 74.24 | In |
| L200AC | heating | 123.71 | 121.76 to 137.68 | In |
| L202AC | heating | 131.14 | 126.71 to 146.84 | In |
| L302XC | heating | 45.18 | 24.59 to 81.73 | In |
| L304XC | heating | 43.57 | 27.72 to 70.27 | In |
| L322XC | heating | 64.23 | 57.57 to 91.66 | In |
| L324XC | heating | 49.62 | 48.33 to 56.47 | In |
| L100AL | cooling | 49.76 | 42.50 to 58.66 | In |
| L110AL | cooling | 53.75 | 47.72 to 61.33 | In |
| L120AL | cooling | 46.24 | 41.15 to 51.69 | In |
| L130AL | cooling | 35.86 | 31.54 to 41.85 | In |
| L140AL | cooling | 24.28 | 21.03 to 29.35 | In |
| L150AL | cooling | 61.14 | 50.55 to 73.48 | In |
| L155AL | cooling | 46.49 | 36.63 to 59.72 | In |
| L160AL | cooling | 60.55 | 52.26 to 68.60 | In |
| L170AL | cooling | 40.73 | 34.16 to 47.58 | In |
| L200AL | cooling | 62.98 | 57.07 to 73.51 | In |
| L202AL | cooling | 53.33 | 50.19 to 60.72 | In |
| 24 case-to-case deltas | ||||
| L110AC-L100AC | heating | 25.67 | 17.53 to 29.62 | In |
| L120AC-L100AC | heating | -11.72 | -16.08 to -9.44 | In |
| L130AC-L100AC | heating | -7.66 | -12.92 to -5.89 | In |
| L140AC-L100AC | heating | -3.68 | -12.14 to 0.24 | In |
| L150AC-L100AC | heating | -10.38 | -10.90 to -3.37 | In |
| L155AC-L150AC | heating | 3.25 | -0.56 to 6.42 | In |
| L160AC-L100AC | heating | 0.79 | -1.96 to 4.54 | In |
| L170AC-L100AC | heating | 10.56 | 8.15 to 15.14 | In |
| L200AC-L100AC | heating | 72.12 | 71.16 to 79.06 | In |
| L202AC-L200AC | heating | 7.43 | 3.20 to 11.26 | In |
| L302XC-L100AC | heating | -6.40 | -25.78 to 22.68 | In |
| L302XC-L304XC | heating | 1.61 | -3.14 to 11.47 | In |
| L322XC-L100AC | heating | 12.64 | 7.79 to 32.01 | In |
| L322XC-L324XC | heating | 14.61 | 5.49 to 38.95 | In |
| L110AL-L100AL | cooling | 3.99 | 0.69 to 6.91 | In |
| L120AL-L100AL | cooling | -3.52 | -8.24 to -0.22 | In |
| L130AL-L100AL | cooling | -13.90 | -18.53 to -9.74 | In |
| L140AL-L100AL | cooling | -25.48 | -30.58 to -20.48 | In |
| L150AL-L100AL | cooling | 11.38 | 7.51 to 15.77 | In |
| L155AL-L150AL | cooling | -14.65 | -16.52 to -11.15 | In |
| L160AL-L100AL | cooling | 10.80 | 6.75 to 12.76 | In |
| L170AL-L100AL | cooling | -9.03 | -12.95 to -6.58 | In |
| L200AL-L100AL | cooling | 13.22 | 11.62 to 17.59 | In |
| L200AL-L202AL | cooling | 9.66 | 5.12 to 14.14 | In |
Speed is the reason Talos exists. Physics this fast makes a new approach to HVAC design possible: every wall moved, window swapped, and system option tried is answered by a full simulation in the moment, so the physics shapes the design instead of grading it afterward.
A model that takes minutes is a compliance check: you run it once, at the end, to bless a design you already committed to. A model that answers while you are still drawing is a different tool. Move a wall. Swap a window. Try the cheaper insulation. When each answer costs nothing, you actually ask, and the physics gets a vote before the decision instead of after it.
There is nothing magical about the speed of Talos. A year of building physics is the same heat balance whichever engine runs it. The speed comes from a compiled Rust kernel and from scope: we solve one problem, homes with our hydronic hardware, and we choose where to trade a little accuracy for it. Research simulators choose differently for good reason: they are general instruments, built to model any building and any equipment, and that generality is what makes them the referees in the chapters above. Chapters I through III audit what our choices cost, misses included. This chapter reports what they bought.
The other half
A fast kernel is half of it. The other half is caching. Expensive results are cached against the inputs they depend on, so an edit re-runs only the work whose inputs changed. A batch simulator has no use for that: its unit of work is a whole run, not an edit. Three things that never rebuild:
The most expensive thing the engine builds is a finite-difference model of the soil under every foundation. It compiles once per design. Room controls and equipment are deliberately left out of its cache key, so you can change a setpoint, swap an emitter or resize the equipment and the ground never rebuilds. A portable seed store carries that compile into a fresh browser session, so the soil does not start cold.
A year of sun positions, shading and per-surface gains depends on the geometry and the weather, not on the question being asked. So it is computed once per set of inputs and shared across all 8,760 hours. Design workers start with it already loaded, and an equipment question never pays for it.
An energy rating is four year-long simulations: the home as designed, its standard-issue reference twin, and an adjustment pair. Each leg is cached under its own key, so an edit recomputes only the legs it touches and the score updates as the design changes instead of starting the rating over. Hot-water dispatch works the same way.
Measured during this build on Apple M3 Max (16 cores, darwin/arm64), 51 cases measured, 1 declared gap. Timings use the fastest measured sample for each case on this machine. They vary with hardware and concurrent workloads and do not predict response time on every device.
Case 960 is measured for accuracy but not timed. Measured through the surface-temperature diagnostic seam required by the two-zone common-wall balance, which is materially more expensive than the production path the other cases are timed on. Not comparable, so not published.
These timings measure simulation work. They do not include every part of an interaction, such as scheduling browser workers or updating the screen, and should not be read as end-to-end design-tool response times.
No comparison to any other tool’s speed appears here. The research simulators in this report solve a more general problem than Talos does, and timing their validation workloads would misstate what they cost at their own job.
Every number in this report so far was measured on our machines, against references we chose. Try Talos to run the building-load engine in your own browser, with a stopwatch on every stage, using a sample home or a supported residential HPXML file.
The demo runs the same building-load pipeline as the design tool: import the home, fetch its weather year, build the thermal model, simulate 8,760 hours, and compare Manual J with physical sizing. It can also estimate an energy rating when the source facts support one. Your HPXML stays on your machine; its location is used to choose and download a weather year.
Try TalosTalos clears every scored group in ASHRAE Standard 140, implements the Manual J worksheet as a procedure in its own right rather than substituting physics for it, and tracks the rating implementation the industry uses across the whole corpus. Every result above is printed as it was measured, misses included.
We keep pushing on both accuracy and speed.
The ratings ecosystem is only beginning to account for air-to-water systems. HPXML, the file format whole-home ratings are built on, has no air-to-water heat pump type at all, so an Aris system has to be described as an air-to-air heat pump to be rated. The workaround drops thermal storage, weather-compensated supply water, and hydronic distribution. That is a gap in the standard rather than in the physics above it, and we intend to help move it forward.
