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Is it normal for moisture to collect on the outside of the window? Follow

Exterior condensation on windows is an increasingly common problem with today's high performing windows. The cause of exterior condensation is like the cause of interior condensation working in reverse. With interior condensation, cold temperatures outside cool the interior pane, dropping the surface temperature below the dew point, where high relative humidity in the house causes the condensation. With today's high-performance windows, the interior cool temperature actually cools the surface of the exterior pane, where the exterior relative humidity causes condensation.
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