Alternative Energy Answers
(Page 3 of 3)
February/March 2006
By Ken Sheinkopf
REDUCING WINDOW CONDENSATION
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We live in an older house that hasn’t been remodeled
much over the years, and we get a lot of condensation on
our windows. I know you would recommend replacing them with
newer windows, but can we do anything about this without
spending much money?
—Bernice W.
Omaha, Nebraska
Basic windows with single or even double panes that have
standard aluminum frames can cause water vapor to condense
on the inside of the windows during winter. That water
often drains to the bottom of window sills where it can rot
the sills and even ruin the wall finish and sheetrock.
Condensation can be a problem in summer, too, when moisture
collects on the outside of windows after the glass surface
falls below the dew point.
Certainly these problems can block your exterior view, but
what’s worse is the damage they can cause to your
home. Frankly, it’s hard to eliminate all the
moisture that accumulates on windows, which is especially
prevalent in single-pane windows or in homes with
inadequate ventilation. But controlling this moisture
problem can help reduce the growth of mold, mildew and
damage to the walls.
One thing you can do is lower your home’s indoor
humidity. Use vent fans in your kitchen and bathrooms to
remove moisture from the house. Make sure your clothes
dryer is vented to the outdoors and the exhaust is flowing
freely out of the machine and into the vent. In winter,
cover your windows with storm windows or insulation kits
available at hardware stores. If you have a humidifier,
make sure it’s not set to put too much moisture into
the home’s air.
Ken Sheinkopf is a communications specialist with the
American Solar Energy Society (www.ases.org).
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