Calculators

Free HVAC calculators for sizing, cost, and efficiency decisions. Start with the sizing wizard, or jump to any tool below.

Sizing

BTU, tonnage, SEER2 tier and installed cost in five steps.

Quick square-footage to tons, adjusted for your climate.

Heating BTU by home size and climate zone.

Per-zone ductless head sizing for rooms and additions.

Heat-loss based boiler output for baseboard or radiant.

Tonnage to CFM plus trunk and branch duct sizing.

Installed price range by state, size and system type.

Air-source heat pump installed cost by state.

Monthly run cost using your state electricity rate.

Monthly payment by amount, rate and term.

Payback period for a higher-efficiency upgrade.

Annual heating cost comparison for your state.

Ducted central vs multi-zone ductless cost.

Utility rebates and geothermal incentives by state.