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Air conditioning is the conditioning of air within a defined space, usually a residence or a place of business. Conditioning usually involves heating or cooling, humidifying or dehumidifying, and filtering or cleaning air. If you have a central air conditioner, your system cools and dehumidifies the defined space. Heating is accomplished by an add-on to the system (such as an electric heat strip) or by a separate unit, such as a furnace.
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