What can you do to keep windows from sweating badly and causing mildew?

Asked by Jamelle
Mobile, AL

The sweatimg of my windows only happens in the winnter.


Scott Grieves, CPM, CEA

Answered by Scott Grieves, CPM, CEA

Kissimmee, FL

Kissimmee Utility Authority

February 18, 2013


It sounds like your windows are subject to the dew point. Without looking at your home several variables could exist and should be checked by an energy rater or a building analyst.

  • What type of windows do you have? Double pane, low-E SHGC .30 or better would help.
  • Does the home have good insulation? R-38 would help in the attic with an ACH less than 5 on the blower door test.
  • What is the age and condition of the HVAC (AC) system? Check the duct work for leaks.

Mold growing in your home is a big concern. Please have your home checked--- comfort, health, or high energy usage could also be related.




For more information:

Read "Our aluminum-frame windows are harboring condensation and mold. Can you recommend window solutions for a damp environment?" a Q&A answered by Steve Saunders.

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