https://www.repairmywindowsanddoors.co.uk/braintree-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 efficiency of energy in homes. This is why it's important to determine and fix the root of the issue. Glass that is smudgey can be an indication of aging windows. There are many reasons your windows might have turned cloudy. Damaged Seals The most frequent cause of misty windows is a broken window seal. The majority of modern windows are constructed with a triple or double pane of glass separated by an air space and vacuum sealed around the edges. These windows are referred to as Insulated Glass Units (IGUs) and can contain inert gases like argon, Krypton or krypton to further decrease the transfer of cold or heat from outside to your house. Window seals, like all manufactured products, have an expected lifespan, and eventually fail due to normal wear and tear. They may also fail because of external forces like high winds or poor installation. However, they also suffer due to environmental factors like solar heating and cooling, humidity and even the use of harsh cleaning products. If window seals fail, they allow humid air between the glass panes in your IGU causing condensation which clouds your view. This can result in higher costs for energy as well as water damage, and an increase in the insulation properties of your windows. A sure sign of a damaged seal is a window that can no longer be cleaned to remove the moisture clouding the view. This typically happens when the moisture inside the window has grown so much that it has exceeded its capacity to be desiccant. It is time to contact a window expert in the event of this. The best way to avoid failure of the seal is to follow the manufacturer's care instructions, which are usually printed on the inside of your window frames. It is also recommended to avoid high-pressure cleaning of your windows as this can harm