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It depends on how many people and how many windows are in the home. As a rough rule of thumb, every 500sq ft needs 1 ton. In lower humidity areas, that can be dropped back some.

There is no correlation. The cooling capacity of the ac unit (btu) should be matched to the heat gain or load of the space to be cooled. Not by rules of thumb estimating load by size. Two spaces of equal size can certainly have differing loads, thus requiring different tonnage.

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