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In the climate where I live it is seldom below 20 degrees Fahrenheit. However, we do get a cold spell everynow again, sometimes lasting 3-4 days. I understand a heatpump is less efficient at lower...

I have a heat pump which appears to be working normally. In the heat mode, and the outside temperature about 45 degrees, and the unit running for about 20 minutes, I checked at the indoor air hander...