Condensation Between Window Panes: What It Means

What Causes Condensation Between Windows

Condensation between window panes happens when the seal between the two glass panes breaks. This allows moisture to enter the space between the glass.

• A failed seal lets humidity in
• Temperature changes cause water to form
• Older windows are more likely to have this issue
• Poor installation can cause seal failure

Signs of a Failing Window Seal

Fogging or misting inside the window is the main sign. You may also notice water droplets or ice forming on the inside during cold weather.

What You Can Do Yourself

You can try to dry out the window if the seal is only slightly compromised. But replacing the window is usually the best long-term fix.

1. 1Check for cracks or gaps in the window frame
2. 2Ensure the window is properly sealed around the edges
3. 3Use a dehumidifier to lower indoor humidity
4. 4Avoid opening windows during high humidity periods

When to Call a Pro

If the window is fogging, ice forming, or cracked, it’s time to replace the window. A pro can also assess if the window frame or installation is at fault.

If you see frost on the inside, or condensation that won’t go away, it’s a sign the window needs replacing. A veteran window installer can confirm this.