Replaced thermostat under a part only warranty. Performed fall inspection on two systems. First unit downstairs gas furnace Trane. Check the electrical components amps on furnace. Found return short on return air. Also found one flex return duct by fireplace insulation coming off and ducts going to wall returns leaking at ceiling were duct connects. Recommend cleaning on system but not before returns are corrected so it doesnâ€™t pull dirt from attic into system. Upstairs unit heat pump checked electrical components and Freon levels. Washed out condensing coil. Capacitor for compressor and condenser fan motor duel run still within six percent range. Disconnect for air handler was not installed with unit when it was installed.