Is Condensation on Windows a Problem?

A little temporary condensation doesn't automatically mean something is wrong with the window. Persistent condensation can still tell you something useful about indoor humidity and surface temperature.

Where is the condensation?

This matters. On the room side, indoor humidity may simply be condensing on cold glass. Between the panes, trapped moisture can indicate a problem with the insulated glass assembly. On the exterior, condensation can occur under certain weather conditions and doesn't necessarily indicate window failure.

What if water collects on the sill?

Wipe up recurring moisture. Repeated wetting can damage paint, trim, drywall, and other nearby materials.

Look at indoor humidity

Showering, cooking, drying clothes, and running humidifiers all add moisture to indoor air. Use ventilation appropriately.

When is it more concerning?

Investigate further when:

• Condensation is heavy and persistent.
• Mold repeatedly grows around the window.
• Trim or drywall is deteriorating.
• Moisture appears during rain rather than cold weather.
• Water is trapped between panes.