Super tune up performed today on a carrier heat pump with air handler installed in 2017. All electrical connections are tight with no corrosion. Blower wheel and evaporator coil are clean. Compressor and condenser fan motor are acceptable. Refrigerant levels are in range. Outdoor unit was washed and waxed. Reversing valve, defrost control board and emergency heat strips are all working as they should. System operating properly at time of departure.