Repairing Double Glazed Windows Double-glazed Windows "blow" in the wind, the gas that insulates them, argon, escapes, causing them reduce their energy efficiency. The good part is that blown double glazing can often be repaired without having to replace your windows completely. The most frequent indication of a failing window https://www.repairmywindowsanddoors.co.uk/wythenshawe-windowrepair/