That gas is the key. It slows heat transfer, keeping your home warmer in winter and cooler in summer. The perimeter seal of the IGU has broken. Moisture from outside air enters the space between the panes. The desiccant becomes saturated, the glass fogs up, and the insulating gas escapes.
If you’ve noticed a hazy, milky film between your window panes that refuses to wipe away—or worse, a puddle of water on the sill after a rainstorm—your double pane window has likely lost its seal. double pane glass repair
Before you call a contractor for a full replacement, let’s break down what failed, why it matters, and whether repair is actually an option. A double pane window isn't just two pieces of glass. It's an insulated glass unit (IGU) . The two panes are separated by a spacer (often filled with drying beads called desiccant) and sealed around the edges. Between the panes is a layer of air or an inert gas like argon or krypton. That gas is the key