Today I arrived on site and performed a winter tune-up on the system. **Indoor Unit (Furnace in Crawl Space):** * Verified the unit is in good overall condition. * Checked and washed the washable 12x24x1 filter. * Confirmed the indoor coil is clean and in good condition. * Inspected the blower wheel, burners, exhaust flue, and heat exchanger; all are in good working order. * Tested for carbon monoxide; result was 0.00 PPM. * Measured a return air temperature of 74.0°F and a supply air temperature of 99.0°F. * Cleared the condensate drain line and cleaned out the primary pan. **Outdoor Unit (Straight Cool in Back Yard):** * Verified the unit is in good condition. * Confirmed the outdoor coil is in good condition. * Tested and inspected the blower motor, compressor, and electrical wiring; all are working properly within manufacturer's specifications. **Additional Actions:** * Dusted the thermostat and tested its operation. * Restored power to the units. *