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Blog Title: What is lowest temperature that a heat pump will work at?
What is lowest temperature that a heat pump air conditioner will work at?
Category: Air Conditioner Parts Post By: EDUARDO MANNING (Green Pond, MI), 07/11/2014

Equipment varies and so does the operating range. However, 40 degrees is a general standard where some heat pumps begin to lose efficiency. Most will continue to work down to 17 degrees, with some equipment going below that. When the thermostat (via outdoor temperature sensor) senses the outdoor temperature is too cold for the heat pump to be used as the primary heat source, it automatically switches to a secondary heating source (gas, propane, oil or electric).

- VICKI CRAIG (Dalesburg, IL), 07/26/2014
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