Repairing Double Glazed Windows When Double-glazed windows "blow", the insulating gas argon escapes, which causes them to decrease their energy efficiency. The good thing is that blowing double glazing is usually repairable without having to replace the windows. The presence of condensation or moisture between your double-glazed windows is the https://www.repairmywindowsanddoors.co.uk/stevenage-windowrepair/