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Is Condensation on Windows a bad sign?

Greg Olmstead Published: Dec. 12, 2019, 6:21 a.m.Last updated: Dec. 16, 2019, 1:34 p.m.

Since the recent cold snap our double glazed windows are running with water, every morning it's all over the window sills, running down the wall - in the bathroom it's even making a puddle on the floor tiles. Now I noticed the seals at the bottom of our windows are starting to get what looks like a black mold - should I be worried? What can I do to stop it - or is condensation on our windows just a part of living in Michigan in winter? 

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