Today I arrived on site and performed a winter tune-up. Here's a summary of the work completed: * **Indoor Unit (Attic Furnace):** * Verified the unit services the upstairs area. * Checked the 20x25x4 pleated filter; customer will provide their own. * Confirmed indoor coil condition is good and clean. * **Outdoor Unit (Side of House, Straight Cool):** * Confirmed outdoor coil condition is good. * **System Components:** * Inspected and verified the following components are in good working order: blower wheel, burners, exhaust flue, heat exchanger, secondary drain pan, primary drain pan, and electrical wires. * **Testing & Measurements:** * Carbon monoxide test resulted in 0.00 PPM. * Recorded return air temperature at 69.0°F and supply air temperature at 132.2°F. * **Condensate Drain System:** * Cleared the drain line. * Cleaned out the primary and secondary pans. * Verified the drain line is strapped. * **Addition