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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.


A Very Quick Guide to A/C Sizing

Air Conditioner Sizing Chart by Square Footage

Product Expert
A Very Quick Guide to A/C Sizing

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, eComfort.com 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 worksheet ahead of time and send us the completed version by email (sales@ecomfort.com) or by fax (1-866-554-4365) and we will get back to you shortly.

Alternatively, if you're sizing for a single room (or multiple rooms to be conditioned independently) and want a good estimate without having to fill out our entire worksheet, you can use our online single-room sizing tool to give you a more accurate estimate than just using the table below.

Single-Room Sizing Tool >


If you're just looking for a rough estimate to guide your air conditioner search, you may reference the table provided by Energy Star below:


Area To Be Cooled
(Square Feet)

Capacity Needed
(BTUs per hour)

100 up to 1505,000
150 up to 2506,000
250 up to 3007,000
300 up to 3508,000
350 up to 4009,000
400 up to 45010,000
450 up to 55012,000
550 up to 70014,000
700 up to 1,00018,000
1,000 up to 1,20021,000
1,200 up to 1,40023,000
1,400 up to 1,50024,000
1,500 up to 2,00030,000
2,000 up to 2,50034,000
Source: http://www.energystar.gov/index.cfm?c=roomac.pr_properly_sized


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