https://www.repairmywindowsanddoors.co.uk/exeter-misted-double-glazing-repairs-near-me/ What Causes a Misty Window? It can be quite frustrating when windows in your home or apartment are smudged. It is easy to fix the problem and prevent it if you understand what causes it. Many people suggest dehumidifiers as a method to remove moisture. This doesn't fix the root of the problem that is a seal failure. Moisture Buildup The most common cause of misty or foggy windows is moisture, especially in older homes that have double- or single-glazed window frames. These kinds of windows were designed to keep heat inside your home and prevent cold air from entering but they can also cause condensation and the build-up of moisture. This can cause damage to the window's glazed or glass surface, which can cause a costly repair or replacement. The accumulation of water on windows is typically caused by the meeting of cold and warm air. This is frequent in homes with high humidity levels However, it could also occur in the event that the seal of your window is damaged or faulty. Every day, you add four to five pints of water to the air every time you boil or cook water. Showers, tumble dryers and watering your house plants all contribute to the indoor moisture. Inhaling and breathing creates a little water vapour. This means that the air in your home is saturated with moisture and when it cools down it will melt on any surface it touches including your window. If you have a triple- or double-paned window and notice condensation between the panes, it is likely the seal has been damaged or broken. Usually, there will be a spacer between two glass panes and this will be designed to trap any moisture that might be in the gap. This spacer is typically invisible but can be spotted by shining a light at the window to look for any streaks or dark spots. It is not unusual to find black mold in the area in which the spacer failed. This is not just unsightly and a health risk. The mould is dif