Heatpump at 26 Degrees ?
Last night the temperature went down to 26 degrees and I noticed the heat pump was running instead of the gas furnace. My house was up to temperature and the outside coils were ice free, but I thought that the gas furnace would provide the heat when it got this cold.
My heat pump is an American Standard Heritage 12 Model 2A6H2036A1000AA, will running the heat pump when it is this cold hurt the unit? How efficient is the heat pump at this temperature?
Note that the thermostat only turns off the heat pump and switch on the furnace if the indoor temperature is more than one degree below the thermostat setting and the thermostat does not have a outside temperature sensor.