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Dual pane windows (also known as insulated glass units or thermal panes) are designed to improve energy efficiency and comfort by sealing two panes of glass together with an insulating air space between them. While these units are built to last, the seals that protect them will eventually wear out over time.

Daily heating and cooling cycles cause the glass and surrounding materials to expand and contract. After years of exposure to sunlight, temperature changes, weather, and normal aging, the seal can begin to break down. Once this happens, outside air and moisture can enter the space between the panes.

The first sign of failure is often a hazy appearance or light fogging between the glass. As moisture continues to build, condensation becomes more noticeable and mineral deposits may begin to form. Left untreated, these deposits can permanently stain or etch the glass, making restoration more difficult.

The good news is that a failed insulated glass unit does not mean the entire window needs to be replaced. In most cases, the insulated glass can be replaced while keeping your existing frame and window components intact—saving thousands of dollars compared to full window replacement.

The sooner a failed insulated glass unit is addressed, the better the outcome. If you notice fogging, condensation, or moisture between your window panes, contact Window Wise for an evaluation before permanent glass damage occurs.