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What size air conditioner do i need for a 12x12 room?

The chart is based on the room size. ft.'s 1,400 sq. BTU's. The area is 400 sq. ft.'s 1,600 sq.'s 9,000 BTU's. Approx. 450 sq. ft., 1,900 sq. 600 sq. ft. of 12,000 BTU's. This is the size of the building.

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