Heating performance tune up times one system. It was suspect blower, evaporator and ductwork. Tightened all wire connections. Tested heat rise .System is a heat pump. Heat rise is 40°. Test amp draw on heat strips. 21 amps. Check outdoor unit. Refrigerant level good at this time. Tested defrost cycle. Coil is clean test the thermostat for proper operation. System operating at manufacturer specs at this time.