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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.


"Love my new windows from Renewal by Andersen. The installation was seamless. The installers were great and very professional. They also made sure to clean up after themselves. Need windows go with Renewal by Andersen."

Tessica Agnew
Feb 28, 2024

"Our windows were the original ones that were installed when they built the house in 1972. They wouldn't open, they had been painted shut. They were single pane and the glaze was cracked everywhere. I had to put plastic up every year to help keep the house warm at least a little bit. My MIL was surprised that there weren't any panes in the windows. Now she loves it. We have put a film on the windows so we can see out but no one can see in. We are loving it!"

Beverley Collins
Feb 16, 2024

"I love my new windows! The installation crew was efficient, courteous and tidy."

Jeannette Kirby
Feb 21, 2024

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