https://www.repairmywindowsanddoors.co.uk/hertford-misted-double-glazing-repairs-near-me/ Clear Up Misted Up Double Glazing Condensation on the exterior of your double-glazed windows is normal and a indication that they're operating in the way they ought to. Condensation within the glass panes however it's a different story. Double glazing that is smudged is more than an eye-sore. It could also indicate that the seals on your window units with insulation have deteriorated or broken. Seals It is normal for condensation to develop on the outside of double glazing. This is an indication that your windows function properly. It is caused by the outside air warming faster than your glass and reaching its dew point. If your windows start to mist on the inside this is a major problem and you must take action. The reason for this is that misting up on the interior of your windows usually means there is problems with the seals and that water has made its way into the gap between the two panes of glass. The windows' seals wear down over time as a result of ageing and wear and tear. They also degrade when exposed to harsh cleaning chemicals, which can damage the material. Poor window installation can also cause misting as the installer might not have followed the correct fixing methods or fitted the frame and the insulated panels correctly. A spacer bar is used to fill in the gap between two panes within a double-glazed window. This creates a thermal barrier, and also provides insulation. The spacer bar is sprayed with a specific desiccant which absorbs moisture and keeps the gap dry. The condensation happens when the spacer bar gets damaged or worn and the water in the gap is able to get through the seals. Double-glazing that's poorly installed and maintained may cause damp and condensation however it could reduce the energy efficiency of your house. The reason is that faulty windows will let cold air in and warm air out, which can cause you to spend more on heating your home.