Fixing a failed double-pane window seal generally ranges from $100 to $400 for a professional defogging or glass unit (IGU) replacement, whereas replacing the entire window frame and sash can cost between $400 and $1,200 per window. Many glass repair companies offer specialized seal repair services where they drill microscopic holes to clear moisture and install breather valves, though replacing the insulated glass insert is usually the more permanent and cost-effective restoration method.
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