Repairing Double Glazed Windows When Double glazed windows "blow", insulating argon escapes and causes the window to lose energy efficiency. The good part is that blown double glazing is often repaired without having to replace your windows completely. Moisture or condensation in between your double-glazed windows is a typical indication https://www.repairmywindowsanddoors.co.uk/walthamabbey-windowrepair/