Repairing Double Glazed Windows When Double-glazed windows "blow" the insulating argon escapes and causes the window to lose its energy efficiency. The good thing is that blowing double glazing is usually repairable without having to replace the windows. Moisture or condensation in between your double-glazed windows is the most common https://www.repairmywindowsanddoors.co.uk/mansfield-windowrepair/