How Your Principal Exhaust System Can Help Prevent Frost on Windows This Winter

December 11, 2024

Winter in Alberta and British Columbia can be unforgiving. With temperatures plummeting, it’s not uncommon for homeowners to find frost forming on the inside of their windows. While upgrading to high-performance windows is ideal, it’s not always affordable. Fortunately, your home’s principal exhaust system can play a key role in minimizing frost buildup and improving indoor air quality—without the hefty price tag.

Why Does Frost Form on Windows?

Frost on windows is caused by condensation. When warm, humid air inside your home comes into contact with the cold window surface, the moisture in the air condenses and freezes, leading to that frosty layer. In our colder regions, the combination of high indoor humidity and low outdoor temperatures makes this a common challenge.

The Role of Your Principal Exhaust System

Your home’s principal exhaust system is designed to regulate indoor air quality by removing stale air, excess moisture, and pollutants. By properly using and maintaining this system, you can reduce the humidity levels inside your home and minimize the conditions that lead to frost on windows.

Here’s how it works:

  • Moisture Control: The exhaust system helps expel excess moisture produced by everyday activities like cooking, showering, and even breathing.
  • Air Exchange: It brings in fresh, drier outdoor air while removing humid indoor air, creating a more balanced environment.
  • Energy Efficiency: Some systems, like heat recovery ventilators (HRVs), also recycle heat from outgoing air to warm incoming air, making them energy-efficient while keeping humidity in check.

Tips to Maximize Your Principal Exhaust System in Winter

If you’re looking to keep your windows frost-free, follow these practical steps to get the most out of your exhaust system:

  1. Run the System Regularly:

    Use your principal exhaust system multiple times a day, especially after activities that generate humidity, such as cooking or bathing. A good rule of thumb is to run it for 15-20 minutes after these activities.

  2. Use Bathroom and Kitchen Fans:

    These fans are often connected to your principal exhaust system. Turn them on while showering or cooking to reduce localized humidity levels.

  3. Check for Blockages:

    Inspect the intake and exhaust vents outside your home for snow, ice, or debris that could restrict airflow.

  4. Set Your System Correctly:

    Ensure your system is operating at the right settings. Some systems allow you to adjust airflow to better suit the colder months.

  5. Consider a Humidistat:

    Pair your exhaust system with a humidistat, which can automatically turn on the system when humidity levels get too high.

  6. Ventilate During Daily Tasks:

    Open windows for short periods while running the exhaust system to allow fresh air circulation without drastically cooling your home.

Additional Tips to Reduce Frost

While your principal exhaust system does the heavy lifting, these supplemental tips can help further reduce window frost:

  • Use Insulating Window Film:

    Apply a clear insulating film to your windows to provide an extra layer of protection against the cold.

  • Keep Curtains Open:

    Allow warm air to circulate around your windows by keeping curtains or blinds open, especially during sunny hours.

  • Relocate Humidifiers:

    If you use a humidifier, make sure it’s not placed near windows or areas prone to condensation.

In Cold Regions, Frost May Still Be Unavoidable

Even with your exhaust system running and all precautions taken, extreme cold temperatures can still lead to some frost on windows. This is a natural occurrence in regions where temperatures dip well below freezing for extended periods. However, by controlling indoor humidity and using your principal exhaust system effectively, you can significantly reduce frost buildup and improve comfort in your home.

Affordable Solutions for a More Comfortable Winter

At LSM, we understand the challenges of keeping your home comfortable during harsh winters. While window upgrades may not always be within reach, maximizing your existing systems, like your principal exhaust system, can make a significant difference. If you’re looking for more ways to improve your home’s energy efficiency and comfort, we’re here to help. Contact us today to discuss your options and find affordable solutions tailored to your needs.

Stay warm, stay comfortable, and let us help you make the most of your home this winter.