Measures to Prevent Window Condensation

Condensation on windows can be bothersome. While window condensation is a good indicator of excessive humidity levels, these measures can help you prevent window condensation.


Condensation on windows can be aggravating. Recurring condensation can cause long-term window damage if left ignored. With these tips, you can keep your windows in good working order and reduce internal and external condensation.

Tips for Reducing Window Condensation Inside and Outside

Peering through cloudy windowpanes caused by interior or exterior window moisture is not pleasant. When the temperature of the air outside and the temperature of the glass are significantly different, window condensation is common. While both interior and exterior window condensation can be annoying, untreated internal moisture is more likely to cause long-term issues. Condensation on the inside and outside of windows is not a symptom of a faulty window, and there are several ways to eliminate condensation in your home.

Condensation on the Inside of Windows

Condensation forms first on windows because glass surfaces are frequently among the coldest elements of your home. This usually manifests itself as water droplets or ice on the inside of your window. Condensation begins to dissipate as the internal air becomes dryer or the glass surface grows warmer.

What causes interior window condensation?

When warm air comes into contact with cool glass on the inside of windows and doors, condensation forms. This is especially prevalent during the winter when the inside air is warmer and more humid and outdoor air is cold and dry. Even if you don’t have a humidifier running, regular activities like bathing, cooking, and even breathing add to the humidity in your home.

Replacement of drafty windows and doors, as well as the installation of a new roof or siding, lowers air infiltration and creates a tighter seal in your home. Although a tighter seal saves money on energy bills, it also retains more humidity, which means condensation on colder surfaces in the home may occur more frequently as a result of these improvements. Mold and mildew thrive in wet settings and organic materials like wood, consequently, indoor window condensation can lead to their growth. Consider condensation on your windows as a warning sign that it’s time to lower the humidity in your home before worse problems arise.

How can I reduce window condensation inside my home?

You can reduce the amount of humidity in your home in a variety of ways. Using a portable dehumidifier or installing a whole-home dehumidifier are two options for reducing air moisture. Cover pots and pans when cooking to keep extra humidity at bay, and make sure the kitchen exhaust fan is turned on. The same can be said for restroom fans. Leaving the bathroom fan on during and after a shower will assist in the removal of humid air from your home. Finally, leaving inside doors open allows for optimum air circulation, preventing humidity from building up in one area.

Condensation on the Outside of Windows

Exterior condensation is more common during the summer months when the outside humidity is higher. When the temperature of the glass is reduced and it comes into touch with that warm, humid air, exterior window condensation happens in the same way as room-side condensation. Condensation on the outside of windows is not a cause for concern. In fact, it’s usually a good sign of a well-functioning window.

What causes condensation on the outside of my windows?

When your window glass is colder than the dew point outside, condensation, or dew, is likely to form on the outside of your window. When the air becomes entirely saturated with water, dew forms spontaneously. High external humidity, little or no breeze, and a bright night sky are the three main causes of exterior window condensation. After a chilly night, homeowners are more likely to see exterior window condensation early in the morning. The dew on the outside of your windows will evaporate as the sun shines and warms the glass.

How can I reduce exterior condensation?

Open window coverings at night to warm up the external glass to prevent exterior condensation. You can also help enhance air circulation by trimming shrubs near windows or doors. Raising the temperature setting on your air conditioner may also help keep your window glass at a warmer temperature.

If you think it might be time to replace or upgrade the windows in your home, contact your local Supercraft installer to schedule a no-obligation consultation to discuss the solutions that might be right for you.