Frigidaire FAM18ER2A window-mounted median room air conditioner

BTU stands for British Thermal Unit and is the rating used for air conditioners. A BTU is defined by the quantity of heat required to raise the temperature of one pound of water one degrees Fahrenheit.

The higher the BTU, the larger space the room air conditioner will cool. Use this helpful guide below to decide which BTU is right for your area:

- 5k BTU: 150 Sq. Ft.
- 10k BTU: 450 Sq. Ft.
- 15k BTU: 850 Sq. Ft.
- 22k BTU: 1,300 Sq. Ft.
- 28k BTU: 1,900 Sq. Ft.

Air conditioner sizes are rated by BTUs, and the size of the room you wish to cool determines how many BTUs you need.

Measure the width and length of the room and multiply those numbers together to determine the square footage.

The higher the BTU, the more square footage the air conditioner will cool. Use this helpful guide below to decide which BTU is right for your area:

- 5k BTU: 150 Sq. Ft.
- 10k BTU: 450 Sq. Ft.
- 15k BTU: 850 Sq. Ft.
- 22k BTU: 1,300 Sq. Ft.
- 28k BTU: 1,900 Sq. Ft.