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As a general rule about 1200 Sq Ft. However the correct way to size is by doing heat load calculations, which is measuring the amount of btu's comming into the structure on a given temp day. Some professional A/C companies will provide this service.

Rule of thumb used by contracters is 600 to 700 square feet per ton on a bungalow.Direction of windows and height of ceilings can have an effect on sizing.

A 13 seer, 3 ton AC unit should cover 1800-2500 square feet. The larger the home the less adequate the 13 seer would be.

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16y ago

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