Today I arrived on site and performed a winter time tune up on the system, confirming it's currently working properly. **Indoor Unit (Furnace in Crawl Space):** * Confirmed the indoor coil is clean and in good condition. * Replaced the pleated 20x25x5 filter (customer requested additional filters for future service). **Outdoor Unit (Straight Cool in Back Yard):** * Verified the outdoor coil is clean and in good condition. * Tested and confirmed proper operation of the blower motor, condenser fan motor, compressor, blower run capacitor, compressor run capacitor, fan run capacitor, contactor, furnace control board, and electrical wiring. * Inspected and confirmed the blower wheel, burners, exhaust flue, ductwork, secured electrical wires, primary drain pan, and secondary drain pan are in good working condition. **System Performance:** * Carbon monoxide levels measured at 0.00 PPM. * Return air temperature: 66.0 Degrees Fahrenheit. * Supply air temperature: 116.0 Deg