Is There Anything That Can Be Applied to Interior Windows to Prevent Steaming & Collecting Moisture?


Condensation forms on interior windows when warm, humid air is exposed to a cold window pane. The water vapor in the warm air can be cooled enough to force it from the vapor phase to the liquid phase. This often is seen on winter mornings, when the air outdoors is significantly colder than the inside air. Using an anti-fog product on the inside window surface can reduce condensation. Reducing the indoor humidity also helps.

Fog Free Anti-Fog Glass Cleaner

  • The Thetford Corporation manufactures Fog Free Anti-Fog Glass Cleaner, a silicone-based formula for interior use only. It prevents morning condensation and steamed-up windows and mirrors, according to the company website. It is available in a 32-ounce spray bottle.

Rain-X Glass Anti-Fogging Wipes

  • Glass anti-fogging wipes by Rain-X are designed for use on interior glass surfaces. They reduce fog and also clean smoke residue from the inside of windows, according to the company website. The Home Repair Geek website notes the wipes may not work as well in extremely cold or humid areas.

Z' Fog Fogless Spray

  • The Comfort House website says the Z' Fog Fogless Spray is an anti-fog and cleaning solution for windows, mirrors or any surface that fogs up. It is available in a 4-ounce spray bottle.

Other Solutions

  • A dehumidifier set near the windows will remove moisture from warm air and thereby reduce condensation on windows. Use an exhaust fan when cooking or using hot water to reduce the moisture in the air, and do not hang wet laundry to dry indoors. Seal basement floors and walls, and use gutters to direct rainwater away from the foundation of the house to prevent water seepage into the house.

    Equalize the moisture content and temperature around windows by running the fan in a whole house forced air system, or open the windows slightly. This reduces the amount of moisture around the windows and eliminates condensation. Installing double-glazed windows or adding storm windows to existing windows keeps cold air away from the interior glass so that condensation does not form.


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