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# Determine the square footage of the area to be cooled using the following formulas: #* For square and rectangular rooms, multiply the length of the area by its width #* For a triangular area, multiply the length of the area by the width and divide by 2 Most rooms can be further divided into these basic shapes to determine the square footage. If the shape of your room is other than square or rectangular, ask your sales associate to help you determine the square footage. # Using the square footage and the chart below, determine the correct cooling capacity. Cooling capacity is measured in British thermal units (BTUs) per hour. {| ! scope="col" | Area To Be Cooled (square feet) ! scope="col" | Capacity Needed (BTUs per hour) | 100 to 150 5,000 150 to 250 6,000 250 to 300 7,000 300 to 350 8,000 350 to 400 9,000 400 to 450 10,000 450 to 550 12,000 550 to 700 14,000 700 to 1,000 18,000 1,000 to 1,200 21,000 1,200 to 1,400 23,000 1,400 to 1,500 24,000 1,500 to 2,000 30,000 2,000 to 2,500 34,000 |} 3.Make any adjustments for the following circumstances: * If the room is heavily shaded, reduce capacity by 10 percent. * If the room is very sunny, increase capacity by 10 percent. * If more than two people regularly occupy the room, add 600 BTUs for each additional person. * If the unit is used in a kitchen, increase capacity by 4,000 BTUs. * Consider where you install the unit. If you are mounting an air conditioner near the corner of a room, look for a unit that can send the airflow in the right direction.

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