https://www.repairmywindowsanddoors.co.uk/hertford-misted-double-glazing-repairs-near-me/ What Causes a Misty Window? It can be quite frustrating when the windows of your home or apartment fog. It is simple to fix the issue and prevent it if you know what is causing it. Many people suggest using dehumidifiers to eliminate the moisture. However this does not address the root cause of the problem the seal issue. Moisture Buildup Moisture is one of the main causes of windows that are misty, particularly in older homes that have double or single windows with glazed frames. The windows were designed to keep cold air from entering your home and keep heat in. However, they can cause condensation and moisture build-up. If left unchecked this can result in damage to the glazed or glass surface of your window, which could lead to a more costly repair or replacement of the window. The accumulation of water on windows is usually caused by the meeting of cold and warm air. This is more frequent in homes that have high humidity levels. However, it can also happen if your window seal is damaged or broken. Every day you add 4 to 5 pints of moisture to the air every time you boil or cook your water. Showers or tumble dryers, and watering plants in the house all add to the indoor humidity. Even breathing in and exhaling 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 meets even your window. If you have a double- or triple-paned glass 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 is designed to absorb any moisture that may be in the gap. This spacer will normally be invisible however, you can detect it by shining a light on the window and looking for dark spots or streaks. If the spacer is not working, it is not unusual to discover black mould in the region, which is unsightly