Repairing Double Glazed Windows When Double-glazed windows "blow" in the wind, the gas that insulates them, argon, escapes, causing them decrease their energy efficiency. The good thing is that blowing double glazing is usually repaired without needing to replace the windows. Condensation or moisture in between your double glazed windows https://www.repairmywindowsanddoors.co.uk/walthamcross-windowrepair/