A Very Quick Guide to A/C Sizing

A Very Quick Guide to A/C Sizing

Air Conditioner Sizing Chart by Square Footage

By  |  Product Expert
By  |  Product Expert

Buying an air conditioner is an important purchase, and it is worth your time to make sure you do it right. The table below 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.


Need a More Precise Measurement?

We're here to help you get the exact product for your needs. If you need a more precise sizing calculation, our experts can give you a complete, professional sizing for your space.


For a fee, you can get the professional sizing worksheet emailed directly to you, or you can speak to an expert directly by calling 866-554-4328. The fee can be applied to your purchase, making this service free to use.


Alternatively, if you're sizing for a single room (or multiple rooms) 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.


 HVAC Room Sizing Calculator


 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 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



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