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  • Writer's pictureJoe Thornton

Why is There Moisture Building Up on My Windows?


Moisture build up on the interior of the window
Moisture On Interior Window Glass

Here at The Window Store, W-S Window and Door Co., a common question we get is. "Why is moisture building up on my windows" In some instances, like when moisture is building up between the panes of glass on an insulated glass unit, it is a window issue, but most often it is a humidity issue.


Condensation on windows is a common problem that many homeowners face. It occurs when warm, moist air comes into contact with a cold surface, such as a window glass. The air cools down and releases some of its moisture, forming tiny droplets of water on the surface. This can reduce the visibility and aesthetic appeal of the windows, as well as cause damage to the window frames, walls, and furnishings.


There are several factors that can contribute to condensation on windows, such as:


- High indoor humidity levels, caused by activities like cooking, showering, drying clothes, or using humidifiers.

- Poor ventilation, which prevents the moist air from escaping or being replaced by fresh air.

- Low outdoor temperatures, which create a larger difference between the indoor and outdoor air temperatures.

- Inefficient or damaged windows, which allow more heat to escape and create colder surfaces.


To prevent or reduce condensation on windows, you can try some of the following tips:


- Use exhaust fans or open windows when cooking, showering, or doing other activities that generate moisture.

- Install a dehumidifier or an air conditioner to lower the indoor humidity levels.

- Increase the insulation and sealing of your windows to improve their thermal performance and reduce heat loss.

- Replace single-pane windows with double-pane or triple-pane windows that have a low-emissivity coating and an inert gas fill. These features help to minimize the temperature difference between the glass and the indoor air.

- Wipe off any excess moisture from the windows with a dry cloth or a squeegee.


Condensation on windows is not only an annoyance, but also a potential source of mold growth and structural damage. By following these simple steps, you can keep your windows clear and your home comfortable and healthy.


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