Preformed heating maintenance on heat pump. Customer wasn’t home care taker only! Confirmed air filter was clean. Checked thermostat and found working properly. Took amp draw on the blower motor 2.6 Found electric heat strips working properly at this time20.9/21.2 Found blower clean and balanced. Evaporator coil has no leaks and is clean and free of any debris. Cleared drain and confirmed safety switches are working properly. Found amp draw on the compressor within manufacturer specs 9.6 Found amp draw on condenser fan motor within specs .89 Contactor shows no signs of arching or pitting. Capacitor is within recommended range. Confirmed refrigerant levels are within manufacturer specs using heat check chart 110/375 Put system into defrost and confirmed this operation is working properly at this time. Returned to service