The answer to 'how to maintain AC' is to regularly clean and inspect your air conditioning unit. This includes cleaning the condenser coils, changing the air filters, and checking the refrigerant levels. Proper maintenance can extend the life of your AC system, improve efficiency, and prevent costly repairs.
Start by turning off power to the unit and removing any debris or vegetation around the outdoor condenser. Use a garden hose to gently spray the coils, being careful not to bend the fins. Replace the air filter every 1-3 months, or as recommended by the manufacturer. Lastly, check the refrigerant levels annually and top up if needed - this is best done by a licensed HVAC technician.