Cool Calc is a cloud-based Manual J, Manual S, and Manual D load calculation tool that lets HVAC contractors, home performance pros, and code officials size heating and cooling systems from any browser. Its distinguishing trick is satellite-image map tracing: users drop a pin on a home's address and outline the building footprint directly on aerial imagery.
The software is recognized by ACCA as Powered by Manual J under the ANSI/ACCA 2 Manual J 2011 standard. Cool Calc supports room-by-room and block loads, multi-system homes, custom design conditions, and detailed construction assemblies.
Cool Calc is popular with smaller contractors, raters, and energy auditors who need ACCA-approved outputs without investing in Wrightsoft-level desktop software. A free tier supports basic load calcs, while the paid plan unlocks full ACCA certification stamping.