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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?
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
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. If your home has double paned windows (also
A temporary cosmetic fix. Defogging removes the cloudiness, but it does not restore the inert gas . You’ll still have poor insulation. Worse, the seal is still broken, so fog usually returns within 1–3 years. We do not recommend this for energy savings. Option 2: Seal Replacement (Partial repair) In rare cases, if the frame is perfect and only the sealant failed, a glazier can remove the glass unit, clean the spacer, and apply new sealant. A double paned window isn't just two pieces of glass