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While you need a system big enough for your home,
bigger isn't necessarily better. Too much cooling capacity means the unit won't stay on long enough to dehumidify the air, leaving you feeling cold and clammy. You also will spend more than necessary.
On the other hand, a heat pump or air conditioner that's too small will not cool effectively and probably will wear out faster.
http://www.fpl.com/
The right sized unit for your home is necessary to ensure maximum cooling satisfaction.
Using a unit with too much cooling capacity will result in a cold, clammy feeling because it will not run long enough to lower humidity. It will also cycle on and off excessively, reducing efficiency and wasting energy. A unit that's too small will not be able to cool adequately. Appliance manufacturers can help you determine what size room air conditioner you need. The result of your calculation will be in BTU/hr. Be sure to buy a unit as close to the recommended capacity as possible.
http://www.move.com/
Proper sizing is very important for efficient air-conditioning. A bigger unit is not necessarily better because a unit that is to large will not cool an area uniformly.
A small unit running for an extended period operates more efficiently and is more effective at dehumidifying than a large unit that cycles on and off too frequently.
http://www.nemmar.com/real-est...osing-Room-AirConditioner.html
It's important that the unit you choose be specially selected for the room it will serve. Undersized units won't cool well and will overwork.
Oversized units will operate inefficiently, cost more to buy and run, and are apt to dehumidify improperly. Your dealer will help you calculate the precise capacity you need. Be prepared to supply him with some specific information: a simple floor plan drawn to show all room dimensions, doors, windows, and which way is North; the number of people it will serve; sources of heat such as lamps, TV, and appliances: an explanation of what's above the intended room; and your insulation provisions.
http://www.frigidaire.com/products/roomair_howtobuy.asp
Buying a room air conditioner model that is bigger than what is needed actually means that it will be using more energy and will not be efficient at all. This wasted energy is because of the cycling of the motor that works to keep the room at the right temperature. On top of an ineffective use of energy, this also means there is more wear on the moving parts as well.
http://www.articlexplosion.com...hoosing+A+Room+Air+Conditioner