2020 Tempstar AC running in great condition. 20x25x4 air filter in good condition. Check again in 1-2 months, especially with remodeling work being done in the house. Visual inspection of indoor. Flush drain pan and drain lines. Run test unit in cooling mode from thermostat. Delta t of 19F with supply temp of 52F. Refrigerant pressures are within spec. Dual run capacitor is within spec. System is operating properly, and efficiently.