REScheck
PNNL (US Department of Energy)
Download from the vendor
www.energycodes.gov
REScheck from the US Department of Energy checks whether a home meets the IECC energy code. It calculates U×A (heat-transfer coefficient times area) for each envelope assembly — walls, roof, floor, windows and doors — compares the total with the code requirement, and produces a compliance report. It covers single- and two-family houses and residential buildings up to three storeys. Suited to architects, engineers and energy consultants. Limitations: it is built on US codes, and the Windows version only goes up to IECC 2015 — newer codes need the browser version.
Ratings & Reviews
| Licence type | Completely Free |
|---|---|
| Licence terms | Free tool from the US Department of Energy, in a browser version and a Windows version, at no cost. |
| Platforms | Windows, Runs in the Browser |
| Engineering field | Architecture, Civil Engineering |
| Tool type | Engineering Calculators |
| Vendor site | www.energycodes.gov |
This link goes to the vendor site. EngiFree hosts no installers and distributes no cracked versions.
Last verified: 2026-10-06
