Condensation on windows is unsightly but worse; it may also cause damage to the window and wood trim surfaces and suggest a more severe issue.

Does Window Condensation Cause a Problem?

Unwanted moisture in homes may lead to structural and cosmetic damage, such as mildew, damp walls and ceilings, and decaying windowsills and frames. These moisture-related problems in windows can be costly to fix if not treated quickly.

Mold and humidity are also hazardous to one’s health. According to the NHS website, residents of a home with moisture and mold are more likely to suffer from respiratory disorders such as asthma and allergies, placing newborns, children, and the elderly at the greatest danger.

Several causes contribute to window condensation and ways for removing condensation from windows that may effectively restore the moisture balance in your home and prevent future condensation on the inside of different types of windows.

If you have a double-pane window, please check out our article on double-pane window moisture control tips.

Factors Causing Window Condensation

Condensation causes fog or frost to build on your windows. Condensation occurs when the temperature of the glass is equal to or less than the dew point of the air in the house. The dew point is inversely proportional to the relative humidity. If the glass temperature is below freezing, frost will develop on it.

Extremely Dry Air in Your Home

If the air in your home is arid, condensation will collect on your window glass.

On the other hand, hot air may be quite humid, causing condensation to form on even the coldest bathroom mirror. So, how does any of this relate to your windows? 

Humidity Level in Your Home

There are two things to think about: To begin, if the humidity level in your home is too high, condensation on the glass is more likely to develop. Furthermore, condensation forms more rapidly if the window glass is too cold.

Inadequate Insulation

Condensation is more common in older houses or those with inadequate window sealing. Nonetheless, even newer homes with improved insulation may experience water accumulation.


Believe it or not, most current air conditioning systems, particularly ones that stress energy efficiency, add humidity to the air. At the same time, we understand your need for warmth throughout the winter.


There is nothing like escaping the windswept wrath of winter and snuggling into a soothing, hot bath or shower. It is important to remember that these activities contribute to the development of heat and humidity.


Most plants assist in keeping the air moist. While we do not propose removing all of your plants and living in a plant-free environment, it is good to do some study to understand which plants do not significantly raise the humidity level in your home.

A Glass That Is Inefficient

Given that a window isn’t a window unless it contains glass, it’s logical to believe that the kind of glass used in your window has a significant impact on its performance. Tri-Pane glass is a good option for boosting home comfort due to its improved thermal performance and insulation. Low-E (low emissivity) coated glass also effectively reduces UV transmission and prevents winter heat loss.

Read also: Ways to Remove Double-pane Windows Condensation.

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Solutions to Prevent Window Condensation in Winter

Below are some ways to avert window condensation:

Because cold air tends to be drier than warm air, many individuals in colder areas use a humidifier to make the atmosphere more pleasant. Although this is OK, excessive humidity is not. 

Bathing, people, cooking, leaking dryer vents, and even houseplants contribute to indoor humidity. Condensation on your windows may accumulate within your walls, producing mildew and other issues. If your windows are fogged up or frosted over, use the following methods to reduce inside humidity:

  • Reduce the humidifier’s setting
  • While having a bath, turn on the bath fan.
  • While the water is heating up, turn on the kitchen exhaust fan. If your kitchen does not already have an exhaust fan.
  • Examine the dryer exhaust vent. Repair any exposed vent pipes and use duct tape to hide any seams.

While you may not want a dehumidifier running in your bedroom at night, you will avoid condensation and its effects if you put it on after you get up and set it to turn off an hour or so later. If you’re wondering, dehumidifiers consume very little energy (much less than tumble dryers); therefore, you won’t notice any rise in your energy bills.

There are various methods for glazing your windows. Storm windows, heat-shrink plastic film, and double- or triple-glazed windows are all ways to improve your windows.

Additional layers of glass improve insulation and boost the temperature of the glazing’s inner layer. Assume the temperature outside is 25°F and your windows are single-glazed. The internal temperature of the glass is unlikely to be much higher than freezing. Even somewhat dry air would condense on the glass at those temperatures. 

If you install a storm window, the inside temperature of the glass will be substantially warmer, minimizing the chance of condensation. As a result, increasing the number of glass layers allows for increased interior humidity without generating ice windows.

To prevent window condensation in the winter, you’ll need to find the ideal balance of interior humidity and window insulation.

The easiest and most effective approach is to upgrade your windows. Choosing windows with Tri-Pane, Low-E glass, and excellent thermal performance will help insulate your home and lessen the extreme temperature changes throughout the winter.

That heat and humidity inside have to go somewhere! You may prevent unnecessary interior warmth and wetness by using exhaust fans when cooking or showering. It may also help guarantee proper circulation throughout the home, so get the air moving!

Keep your tumble dryer vented to the outside if it isn’t a condenser. Additionally, clean your dryer vent regularly to ensure that it continues to work correctly.

Increased home heating systems, mainly if they are operated continuously at a low temperature rather than seldom, may help keep surfaces above the dewpoint. Surface condensation may be decreased by lagging cold pipes and adding insulation.

Consequently, keeping your heater on a low setting is the simplest way to reduce condensation throughout the winter months. Temperature changes, particularly those that occur around dawn, are often the source of condensation on windows.

By maintaining your house at a consistently warm temperature, you may be able to prevent surfaces from becoming chilly enough to cause condensation. You may program a timer to turn it on during the coldest hours of the day to keep the areas toasty and moisture collection at bay. The goal is to avoid blasting hot air into your house for brief periods and then freezing it for the remainder of the time.

Upgrade your house’s insulation – this is a long-term solution that may be expensive, but there are methods to improve your home on a budget. Improving the insulation of your walls and lofts may aid in the prevention of condensation. One of the more costly solutions is to upgrade to double-glazed windows and doors, which give excellent thermal insulation both inside and out.

If your walls aren’t adequately insulated, anti-condensation paint is a fantastic insulation choice. It works by adding a layer of insulation to the walls to keep moisture at bay. Some paints are primers, while others are thick and colorable enough to be topcoats.

It would be best if you kept drapes open to prevent condensation and heat from accumulating on window glass. Keeping your drapes open will protect your draperies from getting damp, which is never pleasant.

Wet laundry in a stuffy room is a definite way to get water droplets on your windows (and a musty smell as a result). A decent washer dryer will make the process simpler and more manageable. Place your drying rack in front of a bright window to speed up the drying process and create a well-ventilated atmosphere. If you must dry your goods inside, ensure you stow them appropriately.

Keeping windows open during activities that generate a lot of moisture in the house, such as cooking, bathing, and drying clothing, may help prevent condensation. If your home’s ventilation, especially in the kitchen, is inadequate, try cooking with lids on to prevent steam from escaping. 

Today’s Homeowner Tips

You may use a hygrometer to measure humidity.

That’s it. I hope you find the ideas informative and helpful. Comment and like below if you have any questions or suggestions for future blog posts. And don’t forget to share this post with your friends and family who may also want to keep their windows condensation-free this winter!

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Editorial Contributors
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Matt Greenfield

Matt Greenfield is an experienced writer specializing in home improvement topics. He has a passion for educating and empowering homeowners to make informed decisions about their properties. Matt's writing focuses on a range of topics, including windows, flooring, HVAC, and construction materials. With a background in construction and home renovation, Matt is well-versed in the latest trends and techniques in the industry. His articles offer practical advice and expert insights that help readers tackle their home improvement projects with confidence. Whether you're a DIY enthusiast or a seasoned professional, Matt's writing is sure to provide valuable guidance and inspiration.

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