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Costs and Benefits of French Door Glass Replacement The majority of French doors are constructed with double-paned glass to increase energy efficiency and reduce outside noise. However, this double paned glass has a tendency to lose its seal as time passes. This causes the window to be smudge-like and the appearance of a milky substance between the two panes of glass. It is easy to replace a damaged pane of glass within the French door. The trick is to prepare the area. Costs The cost of replacing the glass