Heat pump calculator Preliminary sizing.
Recommended heat-pump power range from 4 basic building inputs.
Heat-pump power, preliminary sizing
37,398 - 40,798 Btu/h
Based on an estimated heat loss of 33,998 Btu/h, with a 10-20% band for the uncertainty of the estimate.
Heat pump power classes, nominal kW
- 600+accounts
- 10,000+m² calculated
- 2,000+radiant floor zones
- 100+installers
What size heat pump do I need?
Heat loss1.1 to 1.2heat pump power range
The 10-20% band is the estimate's uncertainty. Hot water is not counted here.
Preliminary sizing from the whole house.
The app sizes it from the room-by-room heat loss, a margin and hot water.
See preliminary heat pump sizing →