A winter in Montreal can be harsh. Biting cold, icy winds, and snowstorms make managing indoor air especially tricky. And yet, proper ventilation remains essential, even during the coldest months. At AirGreen, we understand how counterintuitive it may feel to open windows or run an air exchanger when you're already trying to keep the heat in. That’s why we’re sharing 7 concrete, professional tips to ventilate your home efficiently in winter—without sacrificing thermal comfort.
Why winter ventilation is non-negotiable
Before diving into the tips, it's important to understand why ventilation in winter isn't a luxury—it's a necessity. Indoor air becomes stale quickly in the winter due to the lack of natural airflow. This leads to:
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A buildup of household pollutants (VOCs, dust, smoke).
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A rise in indoor humidity, which promotes mold.
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A heavy, unhealthy atmosphere that can cause headaches and reduce overall comfort.
Ventilation protects the health of occupants, preserves your home’s structure, and optimizes your heating system’s performance.
1. Rely on a heat or energy recovery ventilator (HRV or ERV)
The most effective way to ventilate without letting in the cold? A Heat Recovery Ventilator (HRV) or Energy Recovery Ventilator (ERV). These systems recover heat from the stale air being expelled and transfer it to the fresh incoming air—without mixing the airflows.
At AirGreen, we install high-performance, centralized air exchangers tailored to residential and commercial setups across Greater Montreal, Laval, Longueuil, the North Shore and the South Shore. Our ERV models are especially suitable for airtight, well-insulated homes, since they also manage humidity levels.
2. Set your ventilation system smartly
Many people leave their air exchanger running continuously, which can lead to unnecessary heat loss. Set your unit to run intermittently or at low speed during the coldest periods. Use time slots when the outdoor air is slightly warmer (usually in the afternoon) for more intensive air renewal.
Our experts in HVAC system installation in Montreal will help you configure your equipment for optimal, energy-efficient use, including integration with smart thermostats.
3. Never block intake or exhaust grilles
A common mistake: blocking ventilation grilles to avoid cold air coming in. In fact, this throws off your ventilation system's balance and increases indoor humidity.
Make sure all supply and return vents are clear, cleaned regularly, and properly adjusted. During our seasonal HVAC maintenance visits, we always check these elements to ensure optimal performance.
4. Keep indoor humidity levels in check
In winter, ideal indoor humidity should stay between 35% and 45%. If it's too low, it causes dry skin, irritated airways, and static electricity. Too high, and you’ll get window condensation, mold growth, and heat loss.
Using a combination of a dehumidifier, a whole-home humidifier, and an air exchanger helps maintain a healthy, stable balance.
5. Properly insulate your ventilation ducts
One frequent issue we encounter in homes across Greater Montreal is poorly insulated ventilation ducts—especially those that pass through attics or exterior walls. This results in major heat loss and reduces ventilation efficiency.
At AirGreen, when we install air exchangers, we use CSA-certified insulated ducting and tailor our approach to each building’s layout. This guarantees a constant airflow without unwanted cooling.
6. Avoid over-ventilation during extreme cold snaps
We recommend reducing ventilation intensity when the outdoor temperature drops below -20°C. At those temps, even a high-performance exchanger may let in a bit of cold. Switch to minimum mode, and avoid manually airing out the house by opening windows during these frigid days.
We also recommend installing outdoor temperature sensors connected to your HRV, so the system automatically adjusts based on the weather conditions.
7. Maintain your air exchanger regularly
A dirty unit works poorly, loses efficiency, and can even recirculate contaminated air into your home. It’s crucial to:
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Clean filters every 3 months.
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Check ductwork once a year.
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Have your air exchanger inspected by a certified HVAC professional.
At AirGreen, we offer customized maintenance plans across the North Shore, South Shore, Montreal, Laval, and Longueuil to extend the life of your equipment and keep it performing at its best.
AirGreen’s expertise: your key to winter comfort
We’ve supported hundreds of clients with the installation and maintenance of their ventilation systems, from residential projects in Rosemère, Boucherville and Town of Mount Royal, to commercial buildings in Laval-des-Rapides and Saint-Hubert.
Our work is always customized, based on a full technical evaluation of the site, the household’s lifestyle, the building’s airtightness level, and available budget. We also integrate available provincial grants and tax credits, such as those from Transition énergétique Québec and Hydro-Québec’s LogisVert program.
Final thoughts: healthy air without compromise
Ventilating your home in winter doesn’t have to be a challenge. With the right equipment, proper settings, and professional support, it’s absolutely possible to maintain fresh, healthy air without losing heat. Trust AirGreen for a smart, personalized approach that fits Quebec’s climate realities.
Contact us today for a free evaluation of your ventilation system or to schedule the installation of a high-performance air exchanger before next winter.