Heat Pump Size Calculator
Estimate preliminary heat-pump heating capacity, cooling tons, thermal kilowatts, electrical input and daily operating cost.
Default project preview
68,310 BTU/h
Cooling-ton equivalent
5.69 tons
Electrical input
6.67 kW
Daily electricity
53.4 kWh
Daily energy cost
$9.61
Calculator
Build the material order
Your order will appear here
Enter the project details and calculate a rounded material estimate.
Methodology
Transparent calculation
BuildMeter converts every input to a consistent internal unit, applies the selected allowance, and rounds products up to whole purchasable units.
Base load uses area × entered load rate. Ceiling height, insulation, climate and reserve factors adjust thermal capacity. Electrical input = thermal capacity ÷ COP.
FAQ
Heat Pump Size Calculator questions
Why can an oversized heat pump be a problem?+
Oversizing can shorten cycles, reduce comfort and humidity control, and increase cost.
Does rated capacity stay constant in cold weather?+
No. Air-source heat-pump output and efficiency usually change as outdoor temperature changes.
Can this replace a professional load calculation?+
No. Final selection should use an accepted room-by-room load method and manufacturer performance tables.