Replace or clean air filters regularly
Keep indoor vents and outdoor unit clear of obstructions
Clean dust and debris from the outdoor condenser unit
Check and clean evaporator and condenser coils
Inspect and clean condensate drain lines
Verify thermostat settings and battery condition
Check refrigerant levels and look for leaks
Tighten electrical connections and inspect wiring
Lubricate moving parts if required by the system
Test fan and blower operation
Seal and insulate ductwork to prevent air loss
Schedule professional HVAC maintenance at least once a year
Monitor unusual noises, odors, or reduced cooling performance
Keep the area around the AC unit clean and dry