Condensation on the inside of windows: what to do
This is the most common case, especially in winter and in bedrooms or bathrooms. Warm, moist air in the room cools down when it touches the glass.
- Air the room for 5 to 10 minutes every morning, with the windows wide open.
- Heat steadily rather than in short bursts.
- Avoid drying laundry in a closed room.
- Check the extractor fans in the bathroom and kitchen.
If there is still a lot of condensation despite this, the window probably does not insulate well enough: the inner pane is too cold. Triple glazing keeps the inner pane warmer.
Condensation between the panes
Condensation between the two panes means the seal of the double glazing unit has failed. You cannot wipe it away, and the glazing has lost much of its insulation. The glazing needs replacing or, if the window is old, the whole window.
Condensation on the outside of windows
On a new triple glazed window, a light mist on the outside on a cool night is a good sign: almost no heat from the house gets through the glass, so the outer pane stays cold. It clears once the sun is up.
When should the window be replaced?
- Condensation between the panes
- Heavy condensation inside despite good ventilation
- Mould on the seals or around the frame
- An old frame, single glazing or old double glazing
See also when to replace windows and our window replacement page.
ExploreWindow replacement in Luxembourg
