Repairing Double Glazed Windows When Double-glazed windows "blow" in the wind, the gas that insulates them, argon, escapes, which causes them to lose their energy efficiency. The good thing is that blowing double glazing is usually repaired without the need to replace the windows. The presence of condensation or moisture https://www.repairmywindowsanddoors.co.uk/eltham-windowrepair/