Air Conditioner Sizing Chart

Topic: Sizing Guides

Use this table to get a rough estimate of the capacity you will need for your air conditioning system. Don't forget to call or email us for a free professional sizing estimate.


Buying an air conditioner is an important purchase, and it is worth your time to make sure you do it right. This table provided by Energy Star can be used to get a VERY ROUGH ESTIMATE of how many BTUs you need to cool a given area. However, since there are many additional factors that influence the precise number of BTUs necessary to effectively and efficiently cool your specific area, we highly recommend that you speak with an expert to ensure the most accurate measurements.  

As a service to you, offers FREE professional sizing calculations (valued around $500) by our in-house engineers. Just give us a call at 1-866-554-4328 and speak with our highly trained staff today. If you would like, download our sizing questionnaire ahead of time and send us the completed version by email ( or by fax (1-866-554-4365) and we will get back to you shortly.

Area To Be Cooled
(Square Feet)

Capacity Needed
(BTUs per hour)

100 up to 150 5,000
150 up to 250 6,000
250 up to 300 7,000
300 up to 350 8,000
350 up to 400 9,000
400 up to 450 10,000
450 up to 550 12,000
550 up to 700 14,000
700 up to 1,000 18,000
1,000 up to 1,200 21,000
1,200 up to 1,400 23,000
1,400 up to 1,500 24,000
1,500 up to 2,000 30,000
2,000 up to 2,500 34,000

Back To: Sizing Guides