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When Window Condensation Becomes a Problem

Should you be worried about window condensation? The short answer is no if the condensation is on the outside window glass, which is what usually happens in summer. But if condensation is forming on the inside glass panes—which usually happens in winter—you need to wipe it off before paint starts to peel or mold starts to form. Remember: mold thrives in dark, damp spaces.


How do you prevent window condensation during winter? Renewal by Andersen® of Memphis, your trusted window and door replacement contractor, shares tips here.

When Window Condensation Becomes a Problem

Why Condensation Forms

Condensation forms when warm air meets a cold surface. Upon making contact with the cold glass surface, warm, humid air reaches its dew point and leaves droplets on the surface. Condensation also forms when the air becomes saturated with water vapor.

Preventing Window Condensation

  • Turn off your humidifier – Condensation can form on the inside glass panes if indoor humidity levels are too high. If you have a humidifier, turn it off until humidity levels go back to more manageable levels.

  • Store firewood outside – Most experts would recommend bringing firewood indoors right before burning it. If you store it inside and it wasn’t seasoned properly, there’s the risk the moisture content might increase indoor humidity levels and create a damp environment that’s the perfect breeding ground for mold. Not to mention pests might be hiding in damp wood. Properly seasoned wood should have no scent, bark, or sap, and a moisture content higher than 20%.

Condensation Between Glass Panes

What if you can’t seep to wipe the condensation off? The condensation might have formed between the window panes, which would be a sign the window sealing has failed and you need to install replacement windows. Insulated glass units are filled with either argon or krypton, odorless, colorless gases that prevent heat transfer. If the sealing failed, argon or krypton will leak out and moisture will be allowed to infiltrate the space between the panes, reducing your windows’ energy efficiency.

Need new windows?

Renewal by Andersen of Memphis offers a wide variety of premium doors and windows, including vinyl replacement windows. To schedule a free consultation, call us at (901) 979-4460 or fill out this form.


"I had an excellent group of installers come out to install my windows. Very professional and went out of their way to make sure everything was to my satisfaction. Would recommend these installers to anyone."

Chuck Walker
Nov 27, 2023

"I can't say enough about Renewal by Andersen. From our initial sit down with the salesman to the final touches being put on our new windows, the whole experience was great! The windows look amazing & the installers were very careful to keep everything clean & cause minimal disruption in my home. Yes, they may be a little expensive, but you pay for what you get. These are quality windows installed by trained professionals. Communication was great & time frame was faster than i expected. They really deliver! I literally had nothing to worry about accept writing the check. I would strongly recommend this company to others! And I'll be calling them back out in the Spring to replace the last 3 windows on my house!"

Savanna Jayne
Nov 9, 2023

"Very professional, actually came a week earlier than expected, cleaned up during and after job, and we love our windows!"

Tommy Tipton
Nov 3, 2023

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