Repairing Double Glazed Windows When Double-glazed windows "blow", the gas that insulates them, argon, escapes, causing them decrease their energy efficiency. The good thing is that damaged double glazing is typically repaired without needing to replace the windows. Moisture or condensation in between your double-glazed windows is the most common https://www.repairmywindowsanddoors.co.uk/harpenden-windowrepair/