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How to Tell If Your Double Glazing Needs Changing If you notice double glazing harlesden wetness in between the panes , like fogging or pooling, it's a clear indication your double glazing may need changing. Inspect for visible cracks , chips, or distortion in the glass, as these can jeopardize insulation. Climbing power bills and drafts additionally indicate lowered performance. Additionally, if outside sound really feels louder, your windows could be faili