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Condensation is caused by high humidity in the home. Often times when you get your windows replaced from single pane wood to a double pane vinyl - you will notice this issue. Older windows tend to have more leaks in them, allowing the excess moisture to escape - therefore it will not form on the window. . . but once you eliminate that escape, the moisture will start to sit on the window. This can be a problem if you have not treated the wood on your sills / trim work - so make sure you do that. Also, get a humidistat and you can google ways to control the humidity in your home.
Hope this helps!
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