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ReallyFineWhine t1_j6mvpcc wrote

Test out those new heat pumps I just got installed.

(Boiler is still operational.)

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PvtPug t1_j6n7uvl wrote

Ive actually heard anything under 10° it's more economical to burn oil as the heat pumps have a drop off of efficiency.

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ReallyFineWhine t1_j6n8ktc wrote

The latest heat pumps are rated down to -13F; they'll put out some heat but as you say they're not very efficient at that temperature. They're extracting heat from the air, and at colder temperatures there's less heat to extract.

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