Home has a 2 ton Carrier air source heat pump. 17 years old
Temperature at time of the inspection was 15 degrees. It was operating in the heat mode and heating properly.
I do not get how it was extracting heat from the outside air at 15 degrees.
Mine is set at 30 degrees and it is a 2008 unit.
I do not understand how the exterior unit can take 15 degree air and operate properly.
I also tried in emergency heat mode and it operated.