Heat Pump Room-by-Room Sizer
BTU per room with climate zone
📚 Learn more — how it works, FAQ & guide Click to expand
Learn more — how it works, FAQ & guide
Click to expand
Heat pump sizing
How to use this tool
- 1
Enter house size
- 2
Pick climate + insulation
- 3
See kW needed
Frequently Asked Questions
Heat pump sizing rule?
Modern Manual J style: kW = (area × heat-loss-factor × design temp delta) / 1000. Avoid oversizing — leads to short-cycling, higher bills.
COP vs SCOP?
COP = single-condition efficiency. SCOP = seasonal coefficient (real-world avg). Modern A2W heat pumps: SCOP 3.5-4.5 = 350-450% efficiency.
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