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When we turn on our home heating systems each
fall, many of us experience condensation, or steam,
on windows. Condensation requires a cool surface
and moisture in the air. When the temperature of
the glass drops below the dew point of the inside
air, invisible water vapor in the air condenses on the cool glass.
Over the summer, moisture slowly accumulates in furniture,
walls, woodwork, cloth and other surfaces. In the fall, as the
exterior temperature drops for the first time, some of this
moisture condenses on cold window glass.
Most moisture leaks out of your home as your furnace runs
and vent fans are used. Eventually, all the materials in your
home dry out and moisture stops condensing on the windows.
This normally takes a few weeks. Keeping drapery and window
treatments away from the glass area allows a good flow of air
over the windows and helps reduce condensation quicker.
If condensation continues to form on windows after several
weeks, your home may have excessive moisture. Most
moisture problems can be solved by limiting sources of
moisture and improving ventilation.
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