Upstairs gas furnace 4t close upflow. Drain line clear. Filter replaced. Blower inspected. Evaporator coil inspected. Supply and return plenum inspected. Electrical tightened. Burners inspected. Compressor and refrigerant inspected. Upstairs unit met all manufacturers tolerance specifications. Fully functional. 2012 Downstairs 4t gas closet upflow. Expired manufacturers warranty. Drain line has rust stains but clear. Filter - date on Filter was 2022 and extremely dirty, I brought homeowner to the issue and explained why this is unsafe and not optimal for system longevity and performance. Replaced. The main disconnect is compromised, not working at all. NEC states any high voltage Circuit must have a proper disconnect of power. A major saftey concern. Blower wheel has a layer of buildup. Electrical tightened on the circuit board. Evaporator coil has visual oil stains, performed a leak detection and detected refrigerant molecules. Supply plenum has biological growth present.