Central Air Conditioning

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Central air conditioners work best when the area around the outdoor unit is kept free of debris. Trim bushes periodically so that they are at least 2 feet away. If you have any trees nearby, you will have to keep the grills cleared of leaves in the fall. Consider removing tree branches that cause problems. When mowing, bah the clippings when you are near the unit or direct them away from the unit. Cover the unit during snowy weather. Wash the panel on the outdoor unit with water then rinse with a hose. To prevent rust from spreading, lightly sand any scratches with metal-grade sandpaper and touch them up with any kind of outdoor enamel paint.

Changing the filter.
Change or clear the filter on the indoor unit at least at once a month during the cooling season. Shut off the power to the blower and the outside unit first. In most homes this is exactly the same as changing the filter on a forced-air heating system.