https://www.repairmywindowsanddoors.co.uk/slough-misted-double-glazing-repairs-near-me/ What Causes a Misty Window? It can be frustrating when windows in your home or apartment are smudged. It's actually quite simple to solve and prevent if you know what causes the issue. Many people suggest dehumidifiers to eliminate moisture. This does not solve the root of the problem the cause is a seal failure. Moisture Buildup Moisture is the most common cause of misty windows, particularly in older homes with single or double windows with glazed frames. These windows were designed to prevent cold air from entering your home and keep heat in. However, they could lead to moisture and condensation build-up. If not taken care of, this can result in damage to the glass or glazed surface of your window which can result in an expensive repair or replacement of the window. Moisture build-up is typically caused by cold and warm air colliding and causing moisture to build up on the window. This is more common in homes that have high humidity levels. However, it could also happen if your window seal is damaged or faulty. Everyday living generates a surprising amount of indoor water, each time you boil water or cook meals adding four or five pints of water to the air. Showers and tumble dryers, as well as watering your house plants all contribute to the indoor moisture. Inhaling and breathing releases water vapour. This means that the air inside your home is saturated with moisture. When it cools down it will begin to liquefy on any surface it meets including your window. If you have a double or triple-pane window and you notice condensation between the panes, it is likely that the seal is damaged or broken. There is usually an opening between the panes and it is designed to absorb any moisture that enters the space. This spacer is typically invisible however, you can detect it by shining a light on the window and searching for dark streaks or dark spots. When the spacer fails it is not