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Repairing Double Glazed Windows Double glazing can help you save money and energy in your household bills. However, if your windows and doors are difficult to open or have sagged they could reduce their thermal efficiency. The gap between the glass panes of a double-glazed window is filled with an inert gas, such as the argon gas, krypton gas or xenon. This is the part that most people complain about. Broken Panes Double glass is designed to withstand the elements and keep the glass in place, no matter if