Heatpumps function at essentially any temperature but the amount of heat they move is a function of the outdoor temperature; the lower the outside temperature the less heat, which typically translates into longer run times.
Quote:
Originally Posted by jblum315
I've been told that heat pumps don't function when the outside temperature falls below 45. Seldom happens here, so no way of checking. On the chilliest mornings I turn on the heat for about 20 minutes, then turn it off and all is good.
When I think about paying $400 a month in NY for oil heat I count my blessings
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