Understanding Window Condensation

Window condensation is a common issue faced by homeowners, especially during colder months. It appears as water droplets or a foggy film on the inside or outside of the window panes.

What Causes Window Condensation?

Condensation forms when warm, moist air comes into contact with a cooler surface, such as the window pane. The air cools rapidly, releasing moisture as water droplets. This process is most noticeable when there's a significant temperature difference between the inside and outside of your home. Everyday activities like cooking and showering can increase indoor humidity, contributing to the problem.

How to Avoid Window Condensation

• Improve Ventilation:  Use exhaust fans in all bathrooms to remove humid air during and after showers. If possible, keep the bathroom door open to help moisture dissipate. In the kitchen, use the range hood exhaust when cooking. Also, use lids on  pots and pans to reduce moisture release. Opening windows periodically is another way to help circulate fresh air and reduce indoor humidity levels. Using a ceiling fan will help keep air moving, especially in rooms prone to high humidity.
• Use Window Treatments Wisely: When the blinds are lowered and curtains are closed  tight, this will block airflow around the windows. During the day open the blinds and curtains as much as possible. Even if you can only raise the blinds 6 inches up, this will help let the air circulate.
• Maintain Consistent Temperatures: Try to keep your home at a steady temperature. Sudden drops can increase the chance of condensation forming on cold surfaces.

Adjusting the Humidifier

Several homeowners have chosen to install a humidifier on the furnace. During the winter months the air in the home can be dry. The humidifier is one way to add moisture to the indoor air and maintain a consistent humidity level in the home. As the outdoor temperature falls, the humidity setting must be lowered on the humidifier. If the settings are not lowered with the falling temperature, the excess condensation will form on the inside of the windows. The recommended indoor humidity levels vary depending on the outside temperature. When the outside temperature dips below zero, the humidifier should be at 15% to 20%.

Conclusion

Managing window condensation requires a balanced approach to indoor humidity and air circulation. By understanding what causes condensation and implementing practical strategies—such as improving ventilation, using window treatments wisely, maintaining steady temperatures, and properly adjusting your humidifier settings as outdoor temperatures change—you can minimize moisture buildup on your windows. Consistent monitoring and maintenance will help preserve your home's comfort.