Do heat pumps stop working when it gets cold?

Most of the heat pumps that we sell put out 100% of their capacity at +5F, and are rated to to -15F. Every heat pump has a "low temperature" rating.  The heat pump won't actually stop working at this temperature, but the amount of heat put out below this goes down significantly and the amount of electricity needed to run the heat pump goes up, so for all practical purposes assume that they don't work below this temperature. 


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