Quote:
Originally Posted by Cat320
Maybe I'm missing something here, but heat pumps do not work below about 40F.
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You're not missing anything. They are not very good below about 40F, but they certainly will run.
If you can keep some warm air circulating through it, it essentially will "work", but mostly just circulate that warm air through the racetrack ducts. Using the fireplace and supplemental electric heat provides a source of warm air to keep the coils from freezing up well below the 40F mark.