Condensation

Condensation on window surfaces is a natural process that occurs when the window surface is colder than the surrounding air. On poorly insulating, old windows this usually happens on the inside, which in the past led to the familiar ice flowers in winter, when the condensation on the windows even froze. Today, condensation sometimes occurs on the outside of the windows, because the outside air warms up faster than the well-insulated window surface. Condensation on the outside is harmless; on the inside it can be avoided by fitting windows with a better U-value. Condensation between the panes of a multiple glazing indicates that the glazing is no longer sealed. The windows or the glazing should be replaced. Condensation can also occur at thermal bridges.