Today I arrived on site and performed a winter tune-up. The system is currently working properly. **Indoor Unit (Package Unit, Furnace):** * Verified the unit is in good condition. * Confirmed the pleated 1" filter (14x20x1) needs replacement; customer will provide a new filter. * Confirmed the indoor coil is in good condition. **Outdoor Unit (Side of House, Straight Cool, Package Unit):** * Verified the unit is in good condition. * Confirmed the outdoor coil is in good condition. * Verified the electrical wiring is working properly. **System Components:** * Inspected and verified the blower wheel, burners, exhaust flue, heat exchanger, primary drain pan, secured electrical wires, and ductwork are in good condition and working properly. * Tested for carbon monoxide; result was 0.00 PPM. * Measured a return air temperature of 68.0°F and a supply air temperature of 103.4°F. * Cleared the drain line and cleaned out the primary pan. * Confirmed the condensate dr