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Blown Double Glazing Repairs Near Me Most double-glazed windows come with a warranty - usually 10 or 20 years but certain companies offer lifetime warranties. Verify yours, and get an original copy of any agreements you have made. If you notice condensation or mist on your windows, it's an indication of a damaged seal. This lets moisture be able to get into the insulation. This can cause problems and it's best to fix this issue sooner rather than later. Windows that have been misty When windows mist up it