Repairing Double Glazed Windows Double-glazed Windows "blow" in the wind, argon that is insulating escapes and causes the window to lose its energy efficiency. The good news is that blowing double glazing is usually repairable without having to replace the windows. Condensation or moisture in between your double glazed windows https://www.repairmywindowsanddoors.co.uk/hornchurch-windowrepair/