How to Remove Condensation From Double-Glazed Windows

Double-glazed windows are windows that use two sheets of glass with a small gap between them to provide insulation.

Condensation on windows can damage walls and ceilings. (reference 2)Condensation on windows can damage walls and ceilings. (reference 2)
Double-glazed windows can save energy, and therefore they can save you money on your heating and cooling costs. They also can help insulate your home from noise and reduce condensation. But even though they reduce condensation, they cannot stop it completely. This is because, among other things, double-glazed windows offer less ventilation than regular windows provide.

Wipe down the window with a paper towel. This removes condensation, but it is not a long-term solution to your condensation problem.

Run a dehumidifier to remove moisture from the air and the surfaces of your home, including windows. As a general rule, you want to keep the air in your home between 30 percent and 50 percent relative humidity. You can buy a relative humidity gauge at most hardware stores.

Place chemicals that absorb moisture around the window. Chemicals that absorb moisture include silica gel, which is available at some grocery and home supply stores, and anhydrous calcium sulfate and molecular sieves, which are available at industrial chemical supply stores. You can place these chemicals in an open container on the floor or windowsill. However, these chemicals can be extremely dangerous if consumed by people or pets.

Fix cracks. A poor seal or crack in either pane of the double-glazed window can cause cold air to leak through, resulting in condensation. If the window is cracked, you probably have to replace it. When replacing the glass, look for glass that has a high condensation resistance, or CR, rating. CR ratings range from 0 to 100; the higher the number, the better it is at preventing condensation.

Produce heat near the window. Keeping the glass that is closest to the inside of your home warm can help remove and prevent condensation. Space heaters and baseboard convective heaters below the window work well.

Things You Will Need

  • Paper towel
  • Dehumidifier
  • Silica gel, anhydrous calcium sulfate or molecular sieves
  • Space heater or other source of heat

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.