https://www.repairmywindowsanddoors.co.uk/westminster-misted-double-glazing-repairs-near-me/ Clear Up Misted Up Double Glazing Condensation on the outside of your double glazed windows is normal and is a indicator that they're functioning as they should. Condensation within the glass panes, however it's a different story. Double glazing that has become smudged is more than an eye-sore. It could also mean that the seals on your window units with insulation have been damaged or are broken. Seals It is normal for condensation to form on the outside of double-glazed windows. This is an indication that your windows are working properly. It is caused by the air outside warming up faster than the glass and then reaching its dew point. However, if your windows are misting up on the inside, this is a more serious issue and something you'll have to take care of. The reason for this is that misting on the interior of your windows usually indicates that there is an issue with the seals, and that water has made its way into the space between the two panes of glass. The window seals deteriorate over time as a result of ageing and wear and tear. They also deteriorate when exposed to harsh cleaning chemicals which can cause damage to the material. A poor window installation can cause misting due to the fact that the installer did not use the correct techniques for fixing or fitted the frame or insulated panels correctly. The gap between the two panes of glass in a double-glazed unit is filled with a spacer bar, which creates a thermal barrier and provides insulation. The spacer bar is sprayed with a special desiccant, which absorbs moisture and keeps the gap dry. The condensation occurs when the spacer bar becomes damaged or worn, and the water that is trapped in the gap is able to get over the seals. Double-glazing that's poorly installed and maintained can cause damp and condensation however it could reduce the energy efficiency of your house. This is because defective windows wi