Troubleshooting Window Fogging

Problem: My Window Is Fogged Up. What Now?

Determining the Cause:

The first step in addressing fogged windows is to identify the root cause. Determine if the fog is inside your home, between the glass panes of the sealed unit, or on the exterior of the glass. Remove the screen for casement or awning windows and touch the inside glass. If you can touch the moisture, it's likely a condensation problem.

Condensation Causes and Solutions:

Condensation occurs when the surface temperature is lower than needed to support the relative humidity in the air. While not a window problem, it signals airflow and humidity issues. To eliminate condensation, consider:

  1. Lowering Humidity:
    • Redirect moist air out of the home using efficient venting systems.
    • Use window treatments sparingly to maximize air movement.
  2. Raising Air Temperature:
    • Add heat to the room by redirecting warm air across the window.
    • Consider using a space heater or adjusting local thermostats.

Exterior Fogging: If moisture is outside, it indicates an efficient home system with well-insulated glass.

Mist between Glass Panes: A seal failure causes moisture between glass panes. Refer to your warranty for service details.

Understanding Condensation:

Condensation often occurs during colder weather when moist indoor air meets cooler surfaces. Windows, doors, and skylights can all experience condensation, impacting glass, frames, and weather seals. To reduce condensation:

  1. Invest in High-Performance Energy Star® Certified Windows:
    • Featuring triple glazing, low-emissivity coatings, inert gas, thermally improved spacer bars, insulated frames, and greater air tightness.
  2. Ensure Proper Air Circulation:
    • Maintain airflow near windows to keep the glass surface warmer.
    • Position heat sources strategically to enhance air circulation.
  3. Use Your Heat Recovery Ventilator (HRV):
    • Maintain proper ventilation to minimize moisture build-up.

Managing Indoor Humidity:

Homes today are more airtight, leading to increased moisture build-up. Combat excess moisture by:

  1. Check Your Humidifier:
    • Lower settings to reduce indoor humidity levels.
  2. Enhance Ventilation:
    • Ventilate with exhaust fans in bathrooms and kitchens.
    • Install a heat recovery ventilator (HRV) for improved ventilation.
  3. Reduce Moisture Sources:
    • Use lids when cooking and keep showers short.
    • Ensure proper grading and fix water leaks to keep basements dry.

By following these guidelines, you can troubleshoot, prevent, and address window fogging issues effectively. For expert advice and high-quality solutions, trust The Window & Door Store to elevate your home's comfort and energy efficiency.