Today I arrived on site and performed a winter tune-up on the system. **Indoor Unit (Furnace):** * Located in the crawl space. * Observed the indoor coil to be in fair condition. * Confirmed the pleated 1" filter; customer has spare filters and will replace them. **Outdoor Unit (Straight Cool):** * Located on the side of the house. * Condition of outdoor coil is good and cleaned it today. **Electrical Components:** * Tested and confirmed the blower motor, inducer draft motor, furnace control board, and electrical wiring are working within manufacturer's specifications. **System Components (Good Condition):** * Inspected the blower wheel, burners, exhaust flue, heat exchanger, primary drain pan, secured electrical wires, and ductwork; all are in good condition and working properly. **Testing & Measurements:** * Carbon monoxide test resulted in 0.00 PPM. * Return air temperature: 70.0 Degrees Fahrenheit. * Supply air temperature: 165.0 Degrees Fahrenheit. *