How to Get Moisture Out of Double-Pane Windows

Updated February 21, 2017

There are several reasons to get moisture out of your double-pane windows. For example, moisture from windows can damage wall and ceiling materials. Moreover, persistent moisture condensation can promote mould and mildew growth. Mold and mildew may damage your home and cause health problems. Fortunately, there are some things you can do to remove moisture from your double-pane windows and prevent it from condensing on the windows.

Run a dehumidifier. By drying the air near the inside surface of the window, you can get moisture out of the double-pane windows. A good rule of thumb is to keep the relative humidity between 30 and 50 per cent. This will help prevent many of the problems associated with moisture in the air, including window condensation, mould and mildew.

Circulate the air. Air movement helps remove moisture from the air. If it is warm enough, open the windows in your home and run a standstill fan or exhaust fan. This is particularly important after cooking, laundering and bathing, which add approximately 2 gallons of water/moisture a day to the average house.

Hang packages of chemicals that absorb moisture. These include silica gel, activated alumina, anhydrous calcium sulphate and molecular sieves. While effective in removing moisture from your double pane windows, these chemicals can be difficult to find. Try contacting your local high school or university's chemistry teachers. These individuals may be able to point you in the direction of a local supplier of industrial chemicals.

Remove and replace the double-pane windows. As double-pane windows age, moisture can breach the seal and condense between the layers of glass. When looking for a replacement glass, choose one with a high Condensation Resistance (CR) rating. CR ratings, developed by The National Fenestration Rating Council, range from 0 to 100, with the higher numbers indicating better condensation resistance.


Always take proper precautions when dealing with chemicals.

Things You'll Need

  • Dehumidifier
  • Fan
  • Silica gel, activated alumina, anhydrous calcium sulphate or molecular sieves
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About the Author

Thomas King is a graduate of the University of Pittsburgh School of Law where he served as managing editor of the "Pittsburgh Journal of Environmental and Public Health Law." He currently lives in Aberdeen, Washington where he writes and practices law.