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To begin calculating the BTU's required for any space, you first need to obtain its square video footage by increasing the rooms length by its width. A ceiling height of 8 feet is assumed. To make up for taller ceilings, increase the square video by 12% for each additional foot of ceiling height. As an example, a 12 x 12 room is equivalent to 144 square feet. If the ceiling elevation were 9 feet we would increase 144 x 1.12 for an overall of 161 square feet, Read More Here.

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