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What’s Behind Moisture Buildup on Windows?

Have you ever glanced at your windows on a cold morning and wondered why they’re all fogged up? In this blog post, we take a closer look at the science behind why windows fog up and how different types of windows can influence this phenomenon. 

Moisture Buildup on Windows

Understanding Window Fogging

Windows fog up due to a simple reason: condensation. When warm air inside your home comes into contact with the cold surface of the glass, it cools down and can no longer hold as much moisture. This excess moisture then condenses on your windows, causing them to fog up. Factors like differences in indoor and outdoor temperatures and high internal humidity can increase the chance of fogging.

The Impact of Window Fogging

Beyond being a minor annoyance that hampers visibility, window fogging can also hint at larger issues in your home. Fogging may suggest your windows aren’t providing the insulation you need. This lack of insulation leads to heat loss, potentially increasing your energy bills. It can also indicate excessive humidity in your home, which might lead to other issues like mold or mildew.

The Role of Window Types in Fogging

The type of windows you have can influence how likely they are to fog up. Casement windows, for instance, are designed to seal tightly when closed, which can help keep warm air in and reduce condensation. Meanwhile, custom windows can be designed with certain features or specific types of glass to reduce fogging.

The Solution to Window Fogging

If foggy windows are a persistent issue for you, it might be time to consider a replacement window. Here at Renewal by Andersen® of Montana, we specialize in high-quality, energy-efficient windows. Our replacement windows are designed to limit heat transfer and can be customized to suit the specific conditions of your home, significantly reducing window fogging.

Reach Out to Us

While a bit of fogging now and then is normal, persistent fogging could be a sign of poor insulation or excessive humidity and might indicate the need for window replacement. For window-related concerns and solutions in Billings, MT, don’t hesitate to reach out to Renewal by Andersen of Montana. Call us at (406) 259-3944 or visit our contact page to schedule a consultation.


"I highly recommend Renewal by Andersen. We were treated well and everything went smoothly from start to finish. The company kept in contact with me before, during, and after the installation and let me know what to expect. I'm in love with my new windows! I will be using this company again when we refinish our basement. "

July, 21

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