Why is there condensation between my window panes?

Condensation between window panes indicates a broken seal in your insulated glass unit (IGU), which means the window has lost its energy efficiency and needs replacement.

When you see fog, moisture, or water droplets between the glass panes of a double or triple-pane window, the hermetic seal around the perimeter has failed. This seal is designed to keep the space between panes completely airtight and moisture-free. Once it breaks, outside air and humidity enter the space between the glass, causing condensation that can't be wiped away from either side.

This seal failure is permanent and cannot be repaired. While the window may still open and close normally, it has lost most of its insulating value. The argon or krypton gas that was originally between the panes has escaped, and the Low-E coatings may become damaged by the moisture. In Ottawa's climate, this means significantly higher heating costs and reduced comfort during our cold winters.

The timing of when you notice condensation can vary - it might appear constantly, only during temperature swings, or primarily in morning hours when dew forms. Some windows show just light fogging while others develop heavy condensation or even mineral deposits between the panes. Regardless of severity, the energy performance is compromised.

For Ottawa homeowners, this is actually an opportunity to upgrade to more efficient windows. If your current windows are older double-pane units, replacing them with quality triple-pane windows will provide better insulation than your original windows ever had. You may also be eligible for the Canada Greener Homes Grant (up to $5,000) or Enbridge rebates for energy-efficient window upgrades.

For a free assessment of your failed window seals and replacement options, request a quote from Ottawa Window Pros to discuss energy-efficient solutions for your home.

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