Repairing a double-pane window can range from a quick aesthetic fix for minor cracks to a more involved process of replacing the entire glass unit. Because these windows—officially called Insulated Glass Units (IGUs)—are sealed with insulating gas (like argon) between the panes, a broken seal or shattered glass usually requires replacing the glass unit itself to restore energy efficiency.
When repairing a double pane window, there are several tips and precautions to keep in mind: how to repair a double pane window
| Feature | IGU Replacement | Professional Defogging | DIY Defogging | | :--- | :--- | :--- | :--- | | | Perfect (100% restored) | Good to Fair (depends on stains) | Variable | | Thermal Efficiency | Restored fully | Not restored | Not restored | | Cost | High ($150 - $500+ per window) | Moderate ($70 - $120 per window) | Low ($20 - $50 kit) | | Longevity | 10-20+ Years | 1-5 Years | Unpredictable | | Difficulty | Moderate | N/A (Hired Service) | High Risk | Repairing a double-pane window can range from a