Repairing Double Glazed Windows When Double-glazed windows "blow" they let the gas that insulates them, argon, escapes, causing them reduce their energy efficiency. The good news is that damaged double glazing is typically repairable without having to replace the windows. The most typical sign of a damaged window seal is https://www.repairmywindowsanddoors.co.uk/westbromwich-windowrepair/