Tips for Preventing Condensation on Windows in Cold Canadian Winters

4 min read

Condensation on windows is a common problem during cold Canadian winters. It occurs when warm indoor air comes into contact with the cold glass surface, resulting in moisture buildup. Not only can condensation obstruct your view, but it can also lead to mold growth, damage to window frames, and potential health concerns. In this article, we will provide you with effective tips to prevent condensation on windows and maintain a healthy and comfortable indoor environment during the winter months.

  1. Monitor and Control Indoor Humidity Levels

One of the primary causes of condensation is excessive indoor humidity. Monitor the humidity levels in your home using a hygrometer and aim to maintain a humidity level between 30% and 50%. Use dehumidifiers to remove excess moisture from the air if needed, especially in areas prone to high humidity, such as bathrooms and kitchens. Proper ventilation is also essential to control indoor humidity. Use exhaust fans during cooking, showering, and doing laundry, and ensure that air vents are unobstructed.

moisture problems
  1. Increase Air Circulation

Improving air circulation around windows can help prevent condensation. Keep furniture and drapes away from windows to allow air to circulate freely. If possible, open windows for a few minutes each day to let fresh air in and allow moist air to escape. Ceiling fans can also help improve air movement and reduce the buildup of moisture near windows.

  1. Use Window Insulation Film or Weatherstripping

Window insulation film is an affordable and effective solution to reduce condensation on windows. It creates an additional barrier between the indoor and outdoor environments, minimizing heat transfer and reducing the likelihood of condensation. Apply the film according to the manufacturer’s instructions before the onset of winter. Additionally, check the weatherstripping around your windows and replace any damaged or worn-out seals. Proper weatherstripping helps to seal gaps and prevent drafts, reducing the temperature difference between the indoor and outdoor surfaces. The Pros and Cons of Double Glazing in Canadian Climates.

  1. Ventilate Properly

Proper ventilation is crucial in preventing condensation. Ensure that your home has adequate ventilation systems in place. Use trickle vents, which are small adjustable openings built into some window frames, to allow a controlled amount of fresh air to enter your home while minimizing heat loss. Consider installing mechanical ventilation systems, such as heat recovery ventilators (HRVs) or energy recovery ventilators (ERVs), which help maintain proper ventilation without compromising energy efficiency.

  1. Use Thermal or Insulated Curtains

Thermal or insulated curtains can provide an extra layer of insulation and help prevent condensation. These curtains are designed with insulating materials that reduce heat loss through windows. Close them during the night and open them during the day to allow sunlight to warm the room. Make sure the curtains do not cover the radiators or block the air vents, as this can hinder proper heat distribution and exacerbate condensation issues.

  1. Address Water Sources

Water sources within your home can contribute to indoor humidity and condensation. Check for any leaks or water damage near windows and address them promptly. Repair leaky faucets, pipes, or roof leaks to prevent excess moisture from entering your home. Additionally, ensure that your dryer vents properly outside and not into the interior of your home, as this can introduce excessive moisture into the air.

  1. Install Heat-Reflective Window Coatings

Heat-reflective window coatings, such as low-emissivity (low-E) coatings, can help reduce condensation by reflecting heat back into the room. These coatings improve the thermal performance of the glass, reducing the temperature difference between the indoor and outdoor surfaces. Consult with window professionals to determine the most suitable coating for your windows and climate.

  1. Consider Upgrading to Energy-Efficient Windows

Older windows may be more prone to condensation due to their lower insulation properties. Consider upgrading to energy-efficient windows that are specifically designed to reduce heat transfer and condensation. Energy-efficient windows, such as those with double or triple glazing and low-E coatings, can significantly minimize condensation issues while improving overall energy efficiency.


Preventing condensation on windows during cold Canadian winters requires a combination of moisture control, ventilation, insulation, and proper maintenance. By monitoring indoor humidity levels, increasing air circulation, using window insulation film or weatherstripping, proper ventilation, utilizing thermal curtains, addressing water sources, installing heat-reflective coatings, and considering window upgrades, you can effectively combat condensation issues. Implementing these tips will not only enhance the comfort of your home but also protect your windows and promote a healthy living environment.

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