HVAC BTU
CALCULATOR

Rough AC size from square footage and climate. Runs in your browser. No tracking, nothing saved.

SPACE

Rule-of-thumb only (not Manual J). Pick the climate closest to your summers, then adjust for sun and insulation.

SQ FT CLIMATE SUN INSULATION CEILING FT PEOPLE

ESTIMATE ONLY

Size0 BTU

Tons0 ton

Estimate only. Not a load calculation or a quote. Windows, orientation, duct leaks, humidity and local code change real size. Have an HVAC pro run Manual J before you buy.