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How to Choose the Best-Sized AC

How to Choose the Best-Sized AC

When it comes to your air conditioner, size does matter. If your unit is too big for your home, it will use an unnecessary amount of energy; if it’s too small, it will have to work much harder to maintain a consistent, comfortable temperature.

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If you’re replacing your AC and are wondering what size unit you need, consider these things:

How Big is the Cooling Space?

One of the biggest factors that affects the size of the air conditioner you should install is how big the cooling space is. It makes sense, when you think about it, that the bigger the space you need to cool, the bigger AC unit you’ll need to install.

Typically, the size is determined by using the square footage of the area matched to the recommended BTU (British Thermal Units). The Department of Energy gives a guideline that can help:

  • 100 to 300 sq. ft = 5,000 to 7,000 BTU

  • 330 to 550 sq. ft = 8,000 to 12,000 BTU

  • 550 to 1,000 sq. ft = 14,000 to 18,000 BTU

  • 1,000 to 1,200 sq. ft = 21,000 to 24,000 BTU

  • 1,500 to 2,000 sq. ft = 30,000 BTU

  • 2,000 to 2,500 sq. ft = 34,000 BTU

You can easily determine the square footage of your home by measuring the dimensions of the room — but don’t include rooms that won’t be cooled, such as your garage or unfinished basement.

Are You Remodeling?

If you’re even thinking about adding onto your home or taking a room off, you should factor that into your square footage to best-size your AC. You may not need to get as big of a unit if you’re downsizing, or, if you’re adding on, you may need to up the size of your unit.

For all your AC replacement and installation needs into Atlanta, GA, contact the HVAC experts at Casteel for help.

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