Inspect and clean outdoor unit.

Check refrigerant levels.

Inspect ductwork and flue pipe for leaks.

Inspect indoor coil, motor, and blower.

Inspect unit wiring and electrical disconnect.

Inspect condensate drain pans and drains for proper operation.

Clean condensate lines and check condensate pump operation (if equipped)

Lubricate blower or air handler.

Inspect thermostat (with calibration as required)