Repair !full! — Double Paned Window

If you have 10 foggy windows, IGU replacement at $300 each = $3,000. Full replacement could be $8,000+. You can see why glass replacement is appealing. Do not try to separate the glass panes yourself. A broken seal exposes the sharp edges of the spacer and glass. Moreover, if your window was made before 2000, the spacer may contain desiccant (silica gel) that is caustic. And if the unit ever had a lead-based coating? You’ll create a toxic dust.

Let’s pull back the curtain on double paned window repair—what works, what doesn’t, and how to know when to fix versus replace. A double paned window isn't just two pieces of glass. It is a sealed system. The two panes are separated by a spacer (usually metal or foam) and filled with an insulating gas—typically argon or krypton. The air gap stops thermal transfer (heat moving from one side to the other). double paned window repair

This is almost as labor-intensive as full replacement and often fails again quickly. Most professionals won't offer this. Option 3: Glass Unit Replacement (The real fix) This is the gold standard. You keep your existing window frame (sash) but replace only the insulated glass unit. A glazier removes the old IGU, orders a new one custom-sized, and installs it. If you have 10 foggy windows, IGU replacement

When the seal is perfect, the window keeps warm air out in summer and heat inside in winter. The most common issue isn't broken glass—it's a broken seal . Over time, sun exposure, building settlement, and temperature swings cause the seal to fail. Moisture from the outside air enters the space between the panes. Do not try to separate the glass panes yourself

| Repair Type | Average Cost per Window | Energy Savings Restored? | | --- | --- | --- | | Defogging | $60 – $100 | No | | IGU Replacement (glass only) | $200 – $400 | Yes | | Full window replacement | $600 – $1,200+ | Yes |

If your home has double paned windows (also known as insulated glass units or IGUs), you probably installed them for two reasons: energy savings and comfort. But what happens when those high-tech windows suddenly look like a dirty aquarium?

You’ve likely heard two conflicting pieces of advice: "Just repair the seal" or "You have to replace the whole window." So, which is it?