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