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About 10 years ago I had all the windows in my apartment replaced. Four or five years later, when I would open them to insert a fan or an air conditioner, the top window would slide down 6-12 inches in a few of the windows. Is there anything that I can do to adjust the windows so they don't slide down?


I got a couple good answers for wooden windows. Can anything be done with metal?

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The counter balance is not working correctly, but repairing this or replacing it is non-trivial. Instead, you can pickup a device like this that will create enough friction to hold the window in place. It should be installed between the window and the frame and is a simple DIY job.


enter image description here

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My windows are metal. They removed everything and put in the window with its casing. Does this still apply? – user2278 Apr 18 '11 at 23:30
Sorry, this is designed for a wood window. You will have a difficult time installing this on a metal window, and even if it fits, it may not generate enough friction with metal against metal. Worst case scenario, you can always fall back to a stick to prop it open. – BMitch Apr 19 '11 at 2:56

Assuming the siding is wood, I have used wood hardener applied in small amounts, to the edges of the window and the length of the window track, with a q-tip. Worked for me. I think maybe it expanded the wood ever so slightly. Also I "worked" the window up and down until it seemed dry to the touch and every 5 min afterward for 30 min. Not exact time but close enough, I didn't want them to stick together.

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An older and/or cheaper 100% metal window will have pressure springs similar to what BMitch referenced. They are either missing, worn-out, or non-functional.

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