You should refer any serious central air-conditioner problems such as a defective condenser or a malfunctioning refrigeration system to a trained air-conditioner technician. However, simply keeping the components clean helps prevent most common problems.

Most systems have a replaceable or reusable filter in the furnace or air handler cabinet (usually located inside or very near the air-inlet side). Some systems also employ air filters in the return-air registers inside the house. Replace disposable filters twice a year, or clean a reusable filter according to the manufacturer’s directions.

It is also important to keep the outdoor condenser unit clean and free of debris. Before doing this, you must shut off all power to the unit, both at the main panel and at the disconnect box located near the condenser. Remove or trim any weeds or bushes around the condenser that might restrict airflow through the unit. Then use a screwdriver or nut driver to remove the access panels and the top of the unit. Because the fan unit is often attached to the top, you need to be careful not to stress the electrical wires connecting it.

Cleaning the blower’s fan blades will keep your air conditioner operating efficiently and quietly. Use a rag to wipe them off and scoop up or vacuum any debris at the base of the equipment. Tighten the mounting bolts on the motor and lubricate any oil cups on the motor according to the manufacturer’s directions.

Next, use a soft brush and a vacuum to clean the coils from the outside and then from the inside of the unit. In most cases, there is dirt and debris caked in the recesses between the fins, and this can be very stubborn to remove. (See How to Prepare Your Air Conditioner for Summer for a complete walk-through of this process.)

Materials & Tools HomeTips Recommends for This Project
MATERIALS	TOOLS Rent Tools Here
A/C or Furnace Filter Air Conditioner Coil Cleaner Lubricating Oil	Air Conditioner Fin Comb Canister Vacuum Nut Driver Set Pistol Grip Hose Nozzle Refrigerator Coil Brush Screwdriver Set Work Gloves