How do I reduce the amount of condensation on my windows?

Condensation occurs when water vapour is cooled to the point where it condenses as water droplets on a cold surface. Greater accumulations of condensation will appear on colder window temperatures and homes with high humidity levels. To reduce the amount of condensation on your windows you can:

Reduce the humidity levels in your house

• Ensure that your home has appropriate exterior water barriers to protect your home from outdoor moisture.
• Your kitchen and bathrooms should have ventilation fans to expel indoor moisture.
• Fix all water leaks into the basement and do not allow any standing water in the house or against the foundation wall.
• If necessary, install a sump pump to remove excessive moisture from the soil under the slab.
• Disconnect any humidifiers (if not necessary).
• If required, use a dehumidifier.

Increase the surface temperature of your windows and frames

• Invest in window frames made out of vinyl, wood or fiberglass.
• Energy efficient windows made with a double or triple glaze and low-E (low-emissivity) will also increase the temperature of your windows and reduce condensation build-up.
• Draftproof your windows with weatherstripping tape.

Did you see a building science or energy efficiency term you did not understand? Check out our glossary.