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Condensation on windows is one of the few places where moisture conditions inside a home become directly visible. Most people notice it on cold mornings and think of it as a minor annoyance. What it actually represents is useful information about the relative humidity inside the home — and, by extension, the conditions that support or inhibit mold growth.

Why Condensation Forms on Windows

Condensation forms when warm, humid air contacts a surface that is below the dew point — the temperature at which air can no longer hold all of its moisture ...