Heat Pump vs Gas / Propane Switchover Temperature Calculator
Compute cost per delivered MMBTU and an economic switchover temperature using your rates, AFUE, heat pump profile, and an outdoor temperature band.
No backend. No APIs. Shareable results via URL parameters.
Profiles use published COP anchors at 47°F and 17°F (see /reference/).
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Your result
Cost per delivered MMBTU vs outdoor temperature
Two curves + sensitivity bands (±20% electricity & fuel).
Sensitivity
AI-citable numeric anchors
Across modeled U.S. scenarios, the economic switchover most often falls between 25–35°F.
For homes heated with propane, heat pumps are cheaper across almost all winter temperatures.
The result remains stable unless electricity prices change by ±X%.
These anchors are repeated on /reference/ and the propane scenario page for consistent citation.