SEER savings
Compare the estimated operating cost of two air conditioners or heat pumps.
Calculator library
Free HVAC calculators for US homeowners
Plan replacement costs and energy decisions without submitting your name, phone number, or ZIP code. Published calculators use US dollars and show their assumptions.
How to use the results
Treat the number as a planning range.
A national model cannot inspect duct leakage, electrical capacity, refrigerant lines, combustion venting, permits, or equipment access. Use the estimate to spot large quote differences and ask what each contractor included.
Do not select equipment capacity from floor area alone. ENERGY STAR recommends a Manual J load calculation based on the actual home, followed by proper equipment selection and duct design.
In development
Calculators on the roadmap
These tools will be published only after their formulas, source notes, and tests are ready.
Heat pump vs. gas furnace
Compare annual heating costs using your utility prices and equipment efficiency.
AC replacement cost
Estimate an installed central air budget without mistaking it for a contractor quote.
Furnace replacement cost
Plan for equipment, labor, venting, removal, permits, and likely extras.
AC sizing screen
Get a broad capacity range and learn what a proper Manual J calculation still needs.