Repairing Double Glazed Windows When Double-glazed windows "blow" in the wind, argon that is insulating escapes causing the window to lose energy efficiency. The good news is, blowing double glazing is usually repaired without the need to replace the windows. The most common sign of a damaged window seal is https://www.repairmywindowsanddoors.co.uk/welwyngardencity-windowrepair/