How to install a window air conditioner

Mary Farrell

Two out of three homeowners install their own window air conditioners, according to GE. To avoid any ‘duh’ moments, there are a few questions to answer before going to the store. Plus,take a look at some top-pick air conditioners from Consumer Reports' tests.

Do you have the right windows? Not all windows can accommodate an A/C. Double hung are the easiest. Make sure you measure the width and height of the opening before choosing a model. Avoid windows in direct sun. A unit placed in a shady spot can run up to 10 percent more efficiently, according to the Department of Energy.

Are your windows clean? After you install the A/C you won’t be able to open your windows again for a while. Consider switching to shades so that the airflow isn’t blocked.

Do you have enough power? Make sure there is a three-prong outlet within cord length. (Extension cords aren’t recommended.) Check the load on the circuit you plan to use, it’s best to have a dedicated circuit.

Do you need help? If you’re installing it yourself, ask a buddy to help with the heavy lifting. A unit with a slide-out chassis is easier to install because you can secure the cabinet, then the chassis. Follow the manufacturer’s installation instructions. Unless they say otherwise, the window air conditioner should be level from left to right and pitched slightly toward the outdoors so that water drains properly to the rear of the unit and doesn’t leak into the home. And be sure to fill the gap between the window frame and the sash with foam to keep hot air out and cool air in.

The best air conditioners to install

Small: 5,000 to 6,500 Btu/hr. (Cools 100-300 sq. ft.)

Medium: 7,000 to 8,500 Btu/hr. (Cools 250-400 sq. ft.)

Large: 9,800 to 12,500 Btu/hr. (Cools 350-650 sq. ft.)

—Mary H.J. Farrell (@mhjfarrell on Twitter)



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