Repairing Double Glazed Windows When Double-glazed windows "blow" they let the gas that insulates them, argon, escapes, which causes them to decrease their energy efficiency. The good part is that blown double glazing is often repaired without having to replace your windows completely. Condensation or moisture in between your double-glazed https://www.repairmywindowsanddoors.co.uk/hertford-windowrepair/