The Spruce / Katie Kerpel

Centralair conditionersincorporate two different coils so that cool your home.

The coil that is placed outside of your home is called the condensing coil.

The coil absorbs the heat from the air.

illustration of air conditioner chart for BTUs and room size

The Spruce / Katie Kerpel

Freonis a brand name.

Simply measure the length and width of a room and figure the square footage.

Let’s say it is a 10 foot by 15-foot room.

AC unit in a living room

Paolo De Santis / EyeEm / Getty Images

Multiply the two together to get 150 square foot room.

However, you are not done with the selection process yet.

Now, measure the width from the inner-most part of the side window opening.

Check to see if indeed this unit will fit into the opening you have before purchasing the unit.

This air conditioning chart will help you choose the air conditioner to best cool your room.

Window Air Conditioning Chart

Refrigerant Transition & Environmental Impacts.Environmental Protection Agency.