Many technicians believe the only way to verify refrigerant charge on a heat pump in heating mode is to recover the existing refrigerant charge and weigh in the factory charge. However, most technicians won't go to this depth when a refrigerant charge issue exists. It takes too much time.
There is an alternate way to check the heat pump system charge on the airside that is quick and easy. Let's look at five steps you can use to determine heat pump heating performance as you measure equipment delivered Btus.