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Repairing Double Glazed Windows Double glazing can save you money and energy on your household bills. However, if your windows and doors are difficult to open or have sagged they can reduce their thermal efficiency. The space 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 area of the window where the majority of people have issues with. Broken Panes It doesn't matter if it's from a rogue ball or a strong wind double gl