Window Condensation: Clarity Amid the Mist
- Yellow Pages Admin

- Jan 26
- 2 min read

It’s a very common phenomena for water droplets to form on your windows. Many homeowners assume condensation means something is wrong with their windows and call up their window contractors saying: “my windows are wet, what’s wrong with them?” but that’s not the case. In fact, condensation is a sign that your home has high humidity levels, rather than a window defect.
What Causes Condensation?
Condensation happens when warm, moist air inside your home meets a cold surface, such as the glass on your windows. The moisture in the air turns into water droplets, like how a bathroom mirror fogs up after a hot shower. As glass surfaces are usually the coldest in your home, windows are the first place you’ll see this effect.
Why Is Humidity So High Indoors?
Every home has some level of moisture, but modern homes tend to trap more humidity because they’re built to be energy-efficient and airtight. While this is great for your comfort and heating costs, it also means moisture from everyday activities, such as cooking, showering, doing laundry, and even watering plants, has nowhere to escape. These activities can add up to five pounds of water vapour into the air daily, making your windows foggier than ever! Other factors, such as seasonal changes, renovations, and even new construction can temporarily increase indoor humidity as well, leading to more condensation.
Does Window Style Matter?
Yes, certain window styles, such as bow, bay, or greenhouse windows, often experience more condensation. These designs restrict airflow and extend beyond the insulated wall, making the glass slightly cooler. Improving air circulation around these windows can help reduce condensation.
How to Reduce Humidity and Prevent Condensation
The good news is that you don’t have to learn to live with it. There are steps you can take to manage indoor humidity and protect your windows:
· Use exhaust fans in bathrooms and kitchens while cooking or showering and let them run for a while afterward.
· Ventilate your home by opening windows briefly after high-moisture activities. Outdoor air usually contains less water vapour.
· Unlock your windows for a short duration to help with air flow to reduce the build-up.
· Adjust or turn off humidifiers if your home already has enough moisture.
· Install a Heat Recovery Ventilator (HRV) to bring in fresh air efficiently without losing heat.
· Avoid drying clothes indoors and ensure your dryer vents outside.
· Keep air circulating with ceiling fans or by opening window coverings.
· Check attic and crawl space vents to prevent moisture buildup.
Fleming Windows and Doors Offers Window Installation and Service in St. Catharines
Condensation isn’t a flaw with the windows, but rather a warning sign that your home’s humidity is too high. By improving ventilation and reducing moisture, you’ll not only protect your windows but also create a healthier, more comfortable living environment.
At Fleming Windows and Doors, we’re committed to helping you enjoy beautiful, energy-efficient windows without the worry. We offer quality window installation services for homes throughout St. Catharines and the surrounding area. If you have questions about condensation or want expert advice on upgrading your windows, contact us today. We look forward to working with you.
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