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What makes water condense on the interior of the windows at night when it's cold? [duplicate]

While staying with some relatives, I noticed that all their windows experience terrible interior condensation at night and am wondering about what they can do to prevent it. The house is kept to 70 ...
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Condensation on windows [duplicate]

Having lots of moisture on windows in mornings a few days after turning furnace on now that it's getting colder out this fall. But now one if the windows won't even open! What do I do? Thanks!