A broken seal is among the most common problems associated with double glazing. You should call an expert if your window isn't closing or opening properly. Broken or damaged frames typically indicate that double-glazed windows need to be fixed. This can compromise the house's insulation and reduce its energy efficiency. https://active-bookmarks.com/story12577491/3-ways-to-better-sash-window-repair-reading-without-breaking-a-sweat