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A good rule of thumb is one ton, or 12,000 btu, per 500 square feet of floor area. To get a more accurate estimation you need to take into account for shading provided by trees, how well your house is insulated, sizing and insualtion of your ductwork, number and type of windows, etc.

2006-12-22 05:18:56 · answer #1 · answered by Anonymous · 1 0

THE SIZE OF THE TUBES CARRYING AIR TO THE AREA, DIVIDED BY THE CAPACITY OF THE UNIT!

2006-12-22 11:04:44 · answer #2 · answered by Bonno 6 · 0 0

please refine your question.

2006-12-22 11:03:41 · answer #3 · answered by Anonymous · 0 0

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