Measure the width and length of the space to be cooled. Multiply the two numbers together.
Measure the height of the ceiling. Multiply the product of the calculation in Step 1 with the measured height of the ceiling.
Divide the product of the calculation in Step 2 by 2. This value is the CFM required to cool the space.
Things You Will Need
- Measuring tape
- As an example, if your house is 25 feet wide and 45 feet in length with an 8 foot ceiling, the calculations are 25 x 45 = 1125; 1125 x 8 = 9000; 9000 ÷ 2 = 4500. A house this size requires a cooler that is at least 4500 CFM.