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An air conditioner is too small, and it won't keep your home sufficiently cool.
But what many don't realize is that an oversized system will cycle (turn on and off) more than necessary, wasting expensive energy and possibly putting undue strain on the compressor.
A good contractor will determine the optimum size for your home by making a careful study of your cooling requirements including window dimensions and exposure, floor space, insulation and local climate, heat-generating appliances, and the direction your home faces.
Even the amount of shading trees around your home’s exterior can be a factor. He'll specify the cooling capacity of the system in either Btu/h (British thermal units of heat removed per hour) or refrigeration tons (one ton being equal to 12,000 Btu/h).