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More Information: Smarter air-conditioning
Use fans instead of air-conditioners if possible. (Fans with intake and exhaust fans work best, pulling cool air in and blowing hot air out.) If you must use an air conditioner, be sure to buy an Energy Star rated model, and select the correct size.
"Many people buy an air conditioner that is too large for the space, thinking it will cool better. An oversized air conditioner will actually be less effective than one that is the correct size, and waste energy at the same time. Air conditioners remove heat and humidity from the air. Humidity is removed when the air in a room passes over the cooling coils of an air conditioner. If the unit is too large, it will cool the room quickly, but only remove a portion of the humidity. This leaves the room with a damp, clammy feeling to the air, since the air will not have been circulated enough. A properly sized unit will remove humidity effectively as it cools. Running a smaller unit for a longer time will use less energy to completely condition a room than running a larger unit for a shorter time. "
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