Hitting performance tune up times one system. Filter had been changed recently by client. Inspect blower, evaporator and ductwork. Test all safety features Heating performance tune up times one system. Filter had been changed recently by client. Inspect blower, evaporator and ductwork. Test all safety features high limits and rollouts. Tightened all wire connections. Tested thermostat for proper operation. System operating at manufacturer specs at this time.