Repairing Double Glazed Windows When Double-glazed windows "blow", the gas that insulates them, argon, escapes, causing them lose their energy efficiency. The good news is, blowing double glazing is usually repairable without having to replace the windows. Condensation or moisture in between your double glazed windows is a typical sign https://www.repairmywindowsanddoors.co.uk/acton-windowrepair/