Understanding Window Condensation
Last updated: May 30, 2024
Key Takeaway: While window condensation is often normal, persistent condensation between panes or excessive moisture can indicate a problem with your windows that may require professional attention.
What Causes Window Condensation?
Condensation forms when warm, moist air comes into contact with a cold surface, causing water vapor to turn into liquid. This is most common during temperature changes between seasons, particularly in fall and winter when indoor heating is in use.
Interior Condensation
Forms on the inside of windows, typically caused by:
- High indoor humidity (above 50%)
- Poor ventilation
- Activities like cooking, showering, or drying clothes indoors
- Insufficient insulation
Exterior Condensation
Forms on the outside of windows, usually a sign of:
- Energy-efficient windows (a good sign!)
- High outdoor humidity
- Cool nights following warm days
- Low-emissivity (Low-E) glass coatings
Between-Pane Condensation: A Warning Sign
If you notice condensation between the panes of glass in double- or triple-pane windows, this indicates a broken seal. The insulating gas has escaped, and the window's energy efficiency is compromised. This typically requires professional repair or replacement.
When to Be Concerned
While some condensation is normal, these signs may indicate a more serious issue:
Warning Signs
- Persistent condensation between window panes
- Water pooling on window sills or frames
- Peeling paint or wallpaper near windows
- Mold or mildew growth around windows
- Wood rot on window frames
How to Prevent Window Condensation
Reduce Indoor Humidity
- Use exhaust fans in kitchens and bathrooms
- Vent clothes dryers to the outside
- Consider a dehumidifier if needed
Improve Air Circulation
- Open windows periodically to allow fresh air in
- Use ceiling fans to circulate air
- Keep furniture away from windows
Quick Fix: Window Insulation Kit
For older windows, consider using a temporary window insulation kit during colder months. These clear plastic sheets create an additional barrier against cold air, reducing condensation.
View Window AccessoriesWhen to Call a Professional
Contact a Minmar Windows professional if you notice any of the following:
- Condensation between window panes (indicates a broken seal)
- Persistent water damage around windows
- Mold or mildew growth that keeps returning
- Windows that are difficult to open or close
- Noticeable drafts coming from windows
Need Help With Your Windows?
Our team of window experts is here to help with any questions or concerns about your windows, from condensation issues to full window replacements.