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How to Tell If Your Double Glazing Needs Changing If you see wetness in between the panes , like fogging or pooling, it's a clear sign your double glazing could require changing. Look for visible fractures , chips, or distortion in the glass, as these can endanger insulation. Rising power expenses and drafts likewise show decreased performance. Additionally, if outside noise really feels louder, your windows might be stopping working in sound insulation. Need to k