A few simple steps can add up to a load of savings. Use bath and kitchen fans sparingly when the air conditioner is operating. Inspect and clean both the indoor and outdoor coils. The indoor coil in your air conditioner acts as a magnet for dust because it is constantly wetted during the cooling season.
Dirt build-up on the indoor coil is the single most common cause of poor efficiency.
The outdoor coil must also be checked periodically for dirt build-up and cleaned if necessary. Check the refrigerant charge. The circulating fluid in your air conditioner is a special refrigerant gas that is put in when the system is installed. If the system is overcharged or undercharged with refrigerant, it will not work properly. You may need a service contractor to check the fluid and adjust it appropriately.