As the outdoor temperature drops and we activate our heating system, it's common for condensation to appear on window glass. If this condensation is on the window glass surface, it doesn't signify an issue with the window or the glass itself. In fact, it means the windows are working effectively because they are airtight and keeping air from escaping. A seal failure would result in water droplets forming between the glass panes, rather than on the surface.
Condensation happens when warm moist air encounters a cold surface. As the warm air cools, it condenses on the cold surface transitioning from a gas to a liquid. This explains why a mirror fogs up after a hot shower or why your glass of ice water develops condensation on the outside during a hot summer day.
In the winter, the temperature outside is significantly different from the temperature inside. The window glass is cooled from the outside, creating condensation to form on the inside of the window.
You can take steps to reduce the condensation on your window glass. Many everyday items contribute to moisture in the air, such as plants, aquariums, hot showers, washing machines/dishwashers, and overly active humidifiers.
Relocate plants and aquariums away from the window. If you use a humidifier, adjust it to maintain a level between 30 and 50%. Ventilate your home by opening the window, use the bathroom exhaust fan and open blinds, curtains, or shades to help the window warm up.
You can wipe condensation off the window glass, frame, or windowsill to reduce the risk of mold or mildew. Never scrape or use heat or a hair dryer to remove frost or condensation from the window glass. Doing so will crack the glass.
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