March 26th, 1992

Room Air
Is there a way to place a room air conditioner into a window that opens by sliding horizonally.?

The horizontal window is about 1.7 times the width of the existing window air conditioner I have and about 3 times as tall. I can slide it so it fits against the side of the window and side of the frame. But then I have open space above it and nothing to hold it or keep it from falling out.

YES you can. But what you really want to know is how to patch the rest of the window.

First you must support the air conditioner from falling down. In a conventional double hung window you slide the top window over the to of the AC unit to help hold it in place. Here you need to put some form of support under the AC unit. This can be done with a piece (or 2) of wood angled at a 45 degree angle against the building below the window or a vertical support going straight down to the ground. Obviously you need to determine what would be most practical and best.

Next you need to deal with the opening left above the AC unit. Here a piece of plywood would work very well. However it lacks insulation value. What might be better would be a piece of silver coated Styrofoam. Plane Styrofoam breaks down under direct sunlight and should not be used. The best would be a combination of Styrofoam and plywood layered.

After you get this all in you might want to use some REMOVABLE caulk to seal it up. There is a product called peal and seal caulk that works well. If it doesn’t say it is removable it isn’t (at least not easily and without leaving a residue).

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