The right way to size an A/C device for optimum cooling

The size of the a/c device doesn’t refer to the physical dimensions of the a/c unit, but instead, it refers to its cooling capacity measured in British Thermal Units (BTUs).

  • Whether you intend to install a central air device or a window a/c system, you will achieve optimum efficiency! Therefore, lower utility costs if you choose your a/c device based on the size of your household or the section your unit must cool.

To choose what a/c size is proper for your household, first, you will need to calculate the size of your home’s areas that the a/c device will serve in square feet. To calculate the size, multiply the width times the length of the section to be cooled. The total results are then multiplied by 25 BTU, which is a fairly practical number. This size will allow ample cooling under any climatic condition, be it a rainy, hot, sunny, moist, or humid day. For instance, given a room that is 12 feet wide by 15 feet long, you will multiply the length by the width 12×15 to get 180 Square feet. The 180 square feet will then be multiplied by the 25 BTU per square foot to get you the minimum BTU a/c system you should install. This means 180 × 25 = 4,500 BTU cooling capacity is required for your space. While smaller BTU systems will run continuously to keep up with your temperature requirements, too many units will cool too speedily however won’t remove moisture from the air.



Portable space heater