All of it is one engine rather than a suite of tools, and that is the whole point: the number that sizes your equipment and the number on your February bill come out of the same simulation, so they cannot quietly disagree.
Ten capabilities. Six are checked against a published standard, and the report carries what came back. Four have not been, so rather than claim a standard we do not answer to, here is how they work.
- Room-by-room simulation
- How warm or cool every room actually gets, hour by hour, through a full year of weather.
- Validated againstANSI/ASHRAE Standard 140, the building thermal envelope and fabric load tests.
- Equipment sizing
- How much heating and cooling the house needs, so the equipment is neither undersized nor oversized.
- Validated againstACCA Manual J, followed as a prescribed procedure rather than replaced with our own physics.
- Home energy ratings
- The official energy score for the house, and what that score qualifies it for.
- Validated againstRESNET Publication 002-2024, run end to end as the accreditation suite specifies.
- Solar and shading
- Where the sun actually lands inside the house, and how much heat each window lets through.
- Validated againstANSI/ASHRAE Standard 140, the window orientation, shading and glazing film series.
- Ground coupling
- Heat moving between the house and the ground underneath it, below slabs, crawlspaces and basements.
- Validated againstThe ANSI/ASHRAE Standard 140 ground-coupling cases. That suite publishes no formal pass criteria of its own, so the marks here are ours rather than the standard's.
- Domestic hot water
- The energy a household spends on hot water, and the heat a hot water heat pump pulls back out of the room it stands in.
- Validated againstANSI/RESNET/ICC 301. The procedure that decides how hot water energy is counted in a home energy rating.
- Air exchange
- Air leaking in and out of the house, the ventilation system, and the heat that rides along with it.
- How it worksSolved for each room rather than averaged across the house, so a bedroom at the end of a long duct run is not credited with the whole-house average.
- Duct design
- How much air each vent will really get, once the ductwork as drawn is in the way.
- How it worksTextbook duct pressure loss (Darcy-Weisbach) over the real duct tree, fittings as equivalent length, the fan curve intersected for an operating point, and supply and return held to flow conservation.
- Hydronic design
- How much hot water reaches each radiator or floor loop, and how hard the pump has to work to get it there.
- How it worksOne Newton-Raphson solve over the whole circuit, so shared trunks and home-run loops come out of a single code path, checked against the analytic home-run solution and the balance a reverse-return loop is known to hold.
- Equipment performance
- What a heat pump can really deliver on the coldest night of the year, rather than what the brochure says.
- How it worksCapacity and efficiency interpolated from measured test points, with laboratory and field evidence tracked separately so a manufacturer's claim is never silently mixed with a measurement.
