How do you calculate tonnage for a ceiling fan?

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To calculate the AC tonnage required, you can follow the ’20 BTU per 1 sq ft (8 ft ceiling)’ rule of thumb. So 4700 sq ft * 20 BTU = 235.000 BTU or about 20 tons; but that’s if you would have 8 ft ceilings. You have a 20 ft ceiling; you need to add an additional 150% to that calculation.

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