

Condensation is one of the most common occurrences on windows in winter when there is excessive moisture in the air. While double glazing significantly reduces the likelihood of condensation, it can sometimes occur when there is a temperature difference between the warm air indoors and the cold window surface. To stop condensation on double glazed windows in winter there are a number of methods to use from improving ventilation and reducing humidity, to professional inspection and maintenance.
Condensation on windows looks like water droplets or fog on the glass. It can be extreme with pools of water, one droplet, or a light haze on the window surface. When the cold surface of the glass connects with the warm air, it forms water. The water vapour in the humid air deposits itself on surfaces that are at lower temperatures. This is referred to as the ‘dew point’ which is the point at which condensation will occur. It is more likely to occur in winter when the air outside is much colder than the air inside the home.
Double glazing reduces the occurrence of condensation on windows because of how the windows are designed. Instead of using one pane of glass, double glazed windows use two layers of glass separated by an insulated layer which is usually filled with argon gas. The gap between the two layers of glass provides additional insulation. One of the advantages of this design is that it enhances the windows thermal performance and minimises the temperature difference between the interior and exterior glass, leading to less condensation.


While condensation is less likely, sometimes it can still occur on double glazed windows. In winter, the exterior window surface can become extremely cold and if that meets high warmth and humidity inside the home, condensation may form. Condensation can occur on the inside of double glazed windows if there is high indoor humidity, on the exterior if warm air hits the cold glass surface, or between the panes which indicates a potential problem.
The methods to stop condensation on double glazed windows in winter will depend on where the condensation is occurring. Condensation removal and prevention is very different when it forms on the outside and interior window surfaces compared to between the panes.
One of the many benefits of double glazing is the reduction of condensation compared to single glazed windows. The two panes of glass with a gas filled vacuum seal in between provide a thermal barrier that reduces moisture buildup. However, while this innovative technology is a great solution to fight moisture and condensation, it may occasionally occur, particularly in Winter. The most effective way to reduce the possibility of condensation is by using professionals like Windows for Life, experts in all aspects of double glazing.