Introduction
When something goes wrong with a central air-conditioner, call a service contractor. Better yet, don't wait until a unit breaks down before making that call. Schedule a tune-up for the start of every cooling season. For example, some of the refrigerant may have leaked out -- a condition that gradually diminishes your system's efficiency.

Once a month keep an eye on the points illustrated making sure air flows freely through the condenser, evaporator coils, and your furnace's blower unit. Examine one of the coils and you'll see that it resembles an

Automobile's Radiator
loops of tubing laced through a honeycomb of aluminum fins. Leaves, debris, or even a heavy accumulation of household dust on these fins chokes off the airflow upon which cooling systems depend. When you clean the fins, treat them gingerly; they bend easily, and sharp tools may puncture the relatively soft copper tubing. Don't neglect your furnace's blower unit, either. Moving cool, heavy air strains belts and bearings.

During humid weather, check the condensate drain to be sure that it is carrying off excess moisture.

Maintenance Tasks
Keep the condensing unit clear for airflow. Hose out leaves and keep shrubs pruned back.
During humid weather, check the condensate drain to be sure that it is carrying off excess moisture.
A clogged filter can shut down a unit. Change filters several times per season; never run a system without a filter.

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