https://www.repairmywindowsanddoors.co.uk/manchester-misted-double-glazing-repairs-near-me/ What Causes Misty Windows and How to Prevent It Windows that are stained can be ugly but they also decrease the energy efficiency of homes. This is why it's important to pinpoint and address the root cause of the issue. Foggy windows are an indication of old windows. There are several reasons why your windows have become cloudy. Seals that are damaged The most frequent cause of misty windows is a broken window seal. Most modern windows are made with a double or triple pane of glass that is separated by an air space, and vacuum sealed around the edges. These windows are known as insulated glass units (IGUs) and can contain inert gases such as argon, krypton or krypton to further decrease heat or cold transfer from outside to your house. Window seals, as with all manufactured products have an expected lifespan, and eventually fail due to normal wear and wear and tear. They may also fail due to external forces like high winds or poor installation. They are also damaged by environmental elements like solar heating and cooling or humidity, or even harsh cleaning products. If window seals fail, they allow moisture to pass through the glass panes of your IGU and cause condensation that clouds your view. This can lead to increased energy bills as well as water damage, and an increase in the insulation properties of your windows. A window that isn't cleaned to get rid of the haze of moisture that has encroached on the view is a sign of a failing seal. This is usually the case when the moisture inside the window has accumulated to that it has exceeded its capacity to be desiccant. If occurs it's time to contact an expert in window repair. The best method to avoid failure of the seal is to follow the manufacturer's care instructions, which are typically printed on the inside of your window frames. Avoid high-pressure window washing since it can damage the seal and glass. In addition, it