Today I arrived on site and performed a winter tune-up on the system. Here's a summary of the work completed: **Indoor Unit (Air Handler in Attic Closet):** * Verified the indoor unit is in good condition. * Confirmed the indoor coil is clean and in good condition. * Replaced the pleated 1" filter (customer provided spare filters). * Confirmed filter sizes are 20x30x1 and 12x12x1. * Inspected the blower wheel, secondary drain pan, primary drain pan, and secured electrical wires; all are in good working order. **Outdoor Unit (Heat Pump on Side of House):** * Verified the outdoor coil is in good condition. * Tested and inspected the compressor, blower motor, and electrical wiring; all are working within manufacturer's specifications. **System-Wide Checks:** * Measured a return air temperature of 76.0°F and a supply air temperature of 100.0°F. * Cleared the condensate drain line. * Cleaned out the primary and secondary drain pans. * Tested the safety switch. *