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I have a window that slides to the side, and each time temperature outside drops below 0*C it freezes and there is no way to open it (not that there is ice all over it, just moisture from the room freezes somewhere inside I guess). Are there any (easy) solutions to prevent freezing or making it open when needed?

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What is the material of the window sash and frame (ie. Vinyl, wood, metal) and is it painted? – ChrisP Dec 6 '10 at 20:21
@ChrisP Looks like a vinyl frame and window (metal wrapped into vinyl?). Not painted. – serg Dec 7 '10 at 0:27

My suggestion would be to pull out the window and clean everything really well to make sure nothing is gumming things up. Then I would use a clean rag and wipe all the areas where the window contacts the frame with a good quality silicone lubricant. A little goes a long way with silicone lubricant, you don't need to saturate things with a direct blast. I would avoid wd-40, or other cheap oil sprays, it could make things worse.

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Chris is absolutely right on. Always use a dry silicone spray lube, never an oil based or WD40. This is very common in bathrooms where a lot of condensation forms on the windows. Wipe excessive moisture off the windows and frame whenever possible. – shirlock homes Dec 8 '10 at 8:40

One workaround is to install a heating cable along the perimeter. When you need to open the window you heat it up so it unfreezes.

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