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Dealing With Winter Condensation on Windows

Condensation happens when warm air, which carries more water vapor, comes in contact with either colder air or a colder surface. As a result, the water the former carries becomes liquid, which manifests as precipitation (when it touches cold air) or as beads of water on a cold surface, such as windows or a glass of cold water.

Winter Condensation on Windows

While the science is fairly understood, its effects are more apparent—especially when they occur on your windows. In today’s post, Renewal by Andersen® of Montana discusses why it happens and what you can do about it.

Condensation in Winter vs. Summer

While the same principle applies to whatever season, its effects are subtly different. For example, in summer, condensation happens on the outside-facing surface of your windows. This is harmless, as water will simply evaporate in the presence of air.

But in winter, condensation might take place on the interior-facing surface of the window, which is a symptom that your interior is producing too much humidity and/or you have inadequate ventilation. Either way, it could be a disaster if left unchecked, as your trusted window company can explain.

Getting Rid of Condensation

As condensation is merely a symptom and not the problem itself, you can fix the root of the problem—excessive interior humidity. Here are a few ways to do it:

  1. Make sure your interior’s relative humidity is less than 50%. Use a hygrometer to check.
  2. Install an air conditioner. An AC unit typically reduces humidity in a room.
  3. If an AC isn’t feasible, use a dehumidifier.
  4. Open your windows. Sometimes, simply opening and venting your windows to allow air to circulate can solve humidity problems.
  5. Install our windows. Our windows have better insulation and a double-pane construction, which shields you from the influence of weather outside your home.

Renewal by Andersen of Montana is the area’s most trusted window contractor. Let us help you with your condensation concerns, whether they occur in winter or summer. Call us today at (406) 812-8167 or fill out our contact form to schedule your appointment. We serve residents of Billings and nearby areas.


"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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