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Why is My Double Glazed Window Misted? Double glazing is an excellent way to improve the efficiency of your property and ensure maximum energy efficiency. If you notice that your windows are misting it is a sign that the window seal is broken. This will allow moisture into the insulation portion of your windows and can cause a drastic decrease in performance. This issue is simple to repair. What is it? You may see condensation on the outside of your double-glazed windows from time to time, especially if it's very cold and windy. It's normal and a indication that your windows are functioning well, keeping cold out and the warmth in. It can easily be wiped off, or leave it to be cleared by itself. This is more likely to happen if your double-glazed window mists inside. This is typically a sign that the seal on your double glazing has deteriorated or 'failed' as it is referred to in the field. The moisture can get inside the two glass panes in a double-glazed unit that has failed. The argon, xenon, or krypton gases that are used in these units may also leak out. Once this happens the high-density gases lose their insulation properties and your window is no longer a sealed unit. One of the main reasons for a window's seal to break down is natural wear and tear over the years. This is caused by the constant expansion and contraction of the gases within your double glazed windows as temperatures change. Double glazing seals can be damaged using abrasive chemicals. If the seal on the double-glazed windows you have is broken the warm air could escape between the glass panes, and cool air can get in, causing moisture buildup on the bars that hold the glass unit. This is commonly referred to as a 'blown' window and it can cause costly energy bills during winter. This issue can be addressed by replacing the glass units in your double-glazed windows. This is a far cheaper solution than replacing the entire window, and can guarantee that your home is sealed and insulated. You should also ensure that the company replacing your double-glazed windows is insured. This will protect you in the event of any unexpected problems. Why is it happening? Condensation inside double glazing isn't only unsightly but can also lead to mildew that can deteriorate wood window frames. In extreme instances, black mold can also grow on window frames and cills which isn't good for you or your family. It is important to understand the cause of condensation to understand how best to deal with it. Condensation occurs when the surface temperature of a glass falls below the dewpoint – which is the temperature at which water vapour from the air turns into liquid water. It is therefore common to observe it at late at night or in the early morning when the dewpoint is high and the temperature of air is higher than the glass's surface. Condensation in double-glazed windows will be more frequent as the temperature drops and humidity levels increase. It is generally a natural phenomenon, and doesn't mean that your double glazed windows are in a problem. If the condensation is only visible on the outside of your window and disappears as the sun rises, there is no reason to be concerned about it. Double glazed windows that are damaged or faulty aren't as insulating as they should, which could lead to higher bills. If the seals are broken, moisture could get in between the two panes and cause the windows to mist. There are many causes of misted double glazing, but there are a few that are important to consider. The first sign of a problem with your double-glazed windows is usually when you notice condensation forming on the inside of the window. The next phase will be when you begin to notice water staining or damage to the glass, which could be caused by the trapped moisture between the two glass panes. This could be due to a problem during installation or simply wear and tear as time passes. In some instances this will be a sign that the window is reaching the end of its lifespan and is in need of replacement to increase the insulation efficiency of your home. How do I remove it? Double glazing is a fantastic investment in the energy efficiency of your home and the appearance of your windows. If your double glazing is cloudy or misty, it can ruin the appearance of your windows. Fortunately, the solution to this problem is easy and cost-effective. Double glazing that is misted is caused by condensation or moisture entering the space between your double-glazed windows which must be airtight. This is typically an indication of a broken seal in your window and requires fixing. It is normal for new double glazed windows to have condensation on the outside, especially in cold weather. The glass is chilled by air that has reached its dewpoint. The water vapour will be visible when it gets to the cold surface on your windows. It will disappear as soon as the glass warms up. It is usually only when double glazed windows are misting inside that it is an issue and something needs to be done about it. This is because the condensation is indicating that there is a problem to the seal between the two glass panes of your window and could be a sign of poor installation or chemicals used in cleaning products. To eliminate condensation on your double-glazed windows, there are many methods you can try. Try wiping them clean with a damp cloth. This will usually eliminate the condensation. You can spray them with glass cleaner specifically designed to get rid of the haze of condensation. You can also install a dehumidifier in your home, which will take the moisture away and prevent it from accumulating on windows. There are professional steps that can be used to eliminate double glazed window, which involves drilling a small hole in one of the windows and then pumping in a special desiccant, which will help to dry out the window and prevent future problems. However, misted windows can be dangerous and should be done by a skilled professional. This procedure will restore your double-glazed windows to their original condition and will ensure that you don't have problems with condensation or misting in the future. What is the best way to solve this problem? It is normal for double glazed windows to have condensation on the exterior surface of the glass panes. This is a indicator that your windows are working well. It is easily removed. The condensation is caused by the difference in temperature between the air in the house and the cold glass of the windows. If you notice condensation in between the double-glazed glass panes, this is not normal. You should take immediate action. The window seal is broken and moisture may enter the space between the glass panes. This can cause windows to lose their insulation properties, and impact the energy efficiency of your home. The most effective method to prevent condensation from your double glazed windows is to increase the airflow in your home. You should open your windows at least once a day to let fresh air enter your home and reduce humidity. It is recommended to also make use of extractor fans in areas that produce a lot of moisture such as kitchens and bathrooms. Dehumidifiers are also a great option to actively remove excess moisture from the air and stop it from condensing on cold surfaces like windows. Another method of reducing condensation in your double glazed windows is to clean the glass with an anti-fogging item. These products are available in a majority of hardware stores. They are designed to reduce the build-up of moisture. It is important to keep in mind that these solutions aren't long-lasting and will need to be reapplied periodically. If your double-glazed windows are covered by warranty, contacting an experienced installer is the best method to solve the problem. It is best to use a FENSA certified company as they offer a 10-year warranty and abide by UK Building Regulations.