Why Is There Condensation or Fog Between My Window Panes?
Condensation or fog between window panes is a common issue in double-pane or triple-pane windows. When moisture appears between the glass layers, it usually means the insulated glass unit has failed.
Modern windows are built with two or three panes of glass sealed together and filled with argon gas. This gas acts as insulation, improving energy efficiency and helping keep heat inside during winter and outside during summer. Over time, the seal around the glass unit can fail due to age, temperature changes, or improper installation. Once the seal breaks, moisture enters the space between the panes and causes fogging that cannot be cleaned.
The correct and professional solution is to replace the insulated glass unit. In most cases, the window frame itself does not need to be replaced. Installing a new sealed glass unit restores proper insulation, visibility, and energy efficiency.
Some companies try to offer cheaper shortcuts, such as attempting to remove the moisture, refill gas, or reseal the existing glass. These methods are not a long-term solution. The fog usually returns quickly because the original seal has already failed.
Professional repairs that last involve replacing the old glass unit with a new, properly sealed unit that matches the window. This ensures the window insulates correctly again, improves comfort, and helps reduce energy costs over time.
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