- 1). Measure the length and width of the room with a tape measure. To obtain the square footage, multiply the length by the width.
- 2). Multiply the square footage of the room by 25-BTU. According to the Aubuchon Hardware website, each square foot requires 25-BTU of cooling.
- 3). Add 1,000-BTU for each window in the room to account for cooling loss.
- 4). Add 400-BTU for each person who routinely uses the room. For example, if you're cooling a bedroom that two people use, add 800-BTU. If you are cooling a living room that four people use, add 1,600-BTU.
- 5). Add the BTUs obtained in Steps 2 through 4 to obtain the total BTU output needed.
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