Complete Guide to Installing a Window Air Conditioner

Learn step-by-step how to safely install a window air conditioner in your home with our comprehensive guide.

Home & DIY

FigsiT Project Rating

Take care

Window units are heavy and can fall out of the window. Have a helper, and fasten the brackets before you let go, especially above the ground floor.

Safety gear: Work gloves, A helper

Tools Required (5)

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Materials Needed (7)

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1.
Open the window completely to prepare for installation.
2.
Remove any window screens or storm windows to clear the area.
3.
Measure the width of the window opening to ensure the air conditioner fits.
4.
Attach the side panels to the air conditioner unit as per the manufacturer's instructions.
5.
If using a support bracket, install it under the window sill to support the air conditioner's weight.
6.
Carefully lift the air conditioner and place it on the window sill, centering it in the window opening.
7.
Lower the window sash onto the top of the air conditioner to hold it in place.
8.
Secure the air conditioner by drilling pilot holes and fastening the L-brackets to the window frame using screws.
9.
Extend the side panels to fill the gaps on each side of the air conditioner and secure them with screws.
10.
Apply foam weatherstrips around the window edges and between the window sash and the air conditioner to seal any gaps.
11.
Plug in the air conditioner and test it to ensure proper operation.