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Repairing Double Glazed Windows Double glazing is a great investment for your home, as it saves energy and money on your household bills. However, if your windows and doors are difficult to open or have sagged they may decrease their thermal efficiency. The gap between two glass panes in a double-glazed window filled with an inert gas such as argon and Krypton. This is the area of the window that most people have problems with. Broken Panes Double glass is designed to withstand the elements and keep the g