Repairing Double Glazed Windows When Double-glazed windows "blow", the gas that insulates them, argon, escapes, which causes them to reduce their energy efficiency. The good thing is that blowing double glazing is usually repaired without needing to replace the windows. Moisture or condensation in between your double glazed windows is https://www.repairmywindowsanddoors.co.uk/wokingham-windowrepair/