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If your ambient temp was down in the 30's then you are probably just up against the efficiency curve of the heat pump. They don't stop working at 40 degrees, but these are small units and they simply don't have the stones to pull a lot of heat out of the air when it gets colder. That said, I ran our heat pump during a cold spell when the outside temp was 37 degrees (accurately measured) and the heat pump was putting out air at 104 degrees (also accurately measured). Still, that's nothing compared to the gas furnace. Just sayin'.
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