https://www.repairmywindowsanddoors.co.uk/cheshunt-misted-double-glazing-repairs-near-me/ What Causes a Misty Window? If your windows in your home or apartment fog up it can cause a lot frustration. Fortunately, it is easy to stop and fix when you know the cause of the problem. Many people recommend using dehumidifiers to remove the moisture. However it does not address the root cause of the issue, which is seal failure. Moisture Buildup Moisture is a common cause of windows that are misty, particularly in homes with older double or single glazed window frames. These kinds of windows were designed to hold warm air inside your home, while preventing cold air from getting in however they also lead to condensation and the build-up of moisture. This could cause damage to your window's glazed or glass surface, which could result in a more costly repair or replacement. The formation of moisture is usually caused by warm and cold air interacting and causing condensation to build up on the window. This is more frequent in homes with high levels of humidity However, it could also occur in the event that the seal of your window is damaged or defective. Every day you add four to five pints of moisture to the air each time you cook or boil water. Every shower, tumble dryer usage and watering of house plants contributes to more. Inhaling and breathing creates a little water vapour. This means that the air inside your home is saturated with moisture and when it cools, it will liquify on any surface it touches even your window. If you have a double or triple-paned window and notice condensation between the panes, it is likely the seal has been damaged or broken. Most likely, there is an opening between two panes of glass and this will be designed to absorb any moisture in the space. The spacer is usually invisible but you can identify it by shining a light on the window and looking for dark spots or streaks. It is not unusual to find black mold in the area where the spacer failed.