You likely have an air conditioner that is a heat pump as well. The outside AC condensing unit is probably running so it can heat your home. The outside unit is probably a heat pump, which means it must run so it can produce heat and keep your home warm. It’s an air conditioner in the summer and a heater during the winter. It can do this this by reversing the direction of the Freon flow by using electrically operated valves controlling the Freon through the sealed unit. By reversing the flow/direction of Freon, the inside evaporator coil will get hot instead of cold and the outside condenser coil will get cold instead being hot when the thermostat set for heat.
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