How to Mount an Air Conditioner in a Casement Window

Casement windows slide from side to side instead of up and down like most windows. Because of this, when you decide to install a window air conditioner, you must install a vertical air conditioner so it will fit in the casement window framing. The process for installing a vertical air conditioner is somewhat more laborious than a standard window air conditioner, because you must install supports to handle the weight of the air conditioner.

Difficulty:Moderately EasyWrench setDrillDill bit setBubble levelTape measureHandsawFile1

Attach the supplied support brace to the platform with the supplied hex nut and adjustment bolt, using a wrench. You will see several mounting holes on the platform drilled in a row. Select a hole that allows the end of the platform that will rest the furthest away from the window to be positioned 3/16 inch lower than the part of the platform closest to the window.

2

Slide the window open as far as it will go, and then locate the center of the opening. Place the platform over the center of the window opening, and rest it on the window track. Drill pilot holes through each of the mounting holes located on the platform with a 9/16-inch drill bit. Place the platform off to the side.

3

Peel the backing off the track seal, and then place the seal on top of the window track. This keeps moisture out.

4

Place the platform in place on the window, and secure it with the supplied screws and a screwdriver. Make sure the platform is level from side to side with a bubble level before attaching the screws.

5

Measure the height of the window opening, and then subtract the height of the air conditioner. Cut the plastic window panel to that measurement with a handsaw. Use a file to remove any burrs left from cutting.

6

Slide the plastic panel into the panel frame, and then use a screwdriver to attach the panel frame to the top of the air conditioner with the supplied screws.

7

Cut the side channel seals to equal lengths with a utility knife. Remove the protective backing, and then place the seals onto the sides of the air conditioner. Roll the excess seal around to the bottom edge of the air conditioner.

8

Remove the front panel from the air conditioner. This process will vary slightly depending on the brand you purchased.

9

Lift the air conditioner into the window, and center the mounting holes on the bottom of the air conditioner with the mounting holes on the platform. Secure the air conditioner to the platform with the supplied screws.

10

Place the safety bracket onto the lip on the front of the air conditioner, and then secure the safety bracket to the platform with the supplied screws.

11

Place the cover back onto the air conditioner.

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