Performed annual air conditioner maintenance at a home with four Lennox air conditioners—three of which have been installed between 2019 and the present, and one older unit that, while still functional, is nearing the end of its service life and will likely require replacement if issues arise. Maintenance Tasks Completed on All Units: Cleaned outdoor condenser coils Verified refrigerant levels and measured temperature differentials Checked and cleared all condensate drain lines Inspected and tested capacitors, contactors, and all electrical components Replaced air filters Verified blower operation and airflow Checked thermostat settings and confirmed system response Set all thermostats to 72°F and reviewed thermostat operation with the client All systems are currently operating within normal parameters. No concerns found at this time, though we recommend planning for replacement of the older system in the future if performance declines or repairs are needed.