Well-designed ventilation in schools: a decisive lever for academic success
At AirGreen, we know that indoor environments have a direct impact on well-being, health, and productivity. When it comes to educational settings, air quality becomes a critical—yet often overlooked—factor. That’s why we conducted an exclusive study on how optimal ventilation in schools across Greater Montreal, including Laval, Longueuil, the North Shore, and the South Shore, affects student concentration. The results are clear: a properly calibrated air exchanger significantly enhances students’ focus, comfort, and ultimately, their academic performance.
The invisible challenges of stale air in schools
Classrooms are often overcrowded, poorly ventilated, and exposed to high levels of CO₂. This odorless gas, produced by human respiration, can quickly reach critical thresholds in closed spaces. When CO₂ levels rise above 1,000 ppm (parts per million), the following symptoms can appear: fatigue, headaches, decreased focus, drowsiness.
In the schools we visited across Montreal and the South Shore, we recorded levels sometimes exceeding 2,000 ppm, especially in winter when windows remain shut. The result? A heavy learning environment conducive to distraction and disengagement.
Our exclusive study: methodology and findings
Between January and March 2024, we temporarily installed heat recovery air exchangers (HRVs and ERVs) in 12 elementary and high schools located in Laval, Longueuil, Repentigny, Brossard, and Blainville. The goal: compare, under equal conditions, the cognitive performance of students exposed to optimal ventilation versus those in naturally ventilated or under-ventilated spaces.
Technical specifications of the systems used
-
Brand: Venmar EVO5 700 HRV and Vanee G2400 ERV
-
Airflow: 130 to 200 CFM, depending on classroom size
-
Filtration: MERV 13, with activated carbon filters in urban zones
-
Energy efficiency: 75% to 84%, Energy Star certified
-
Noise level: below 1.0 sones
These systems were installed outside class hours by our specialized team, with special care given to balancing fresh air intake and exhaust.
Results: a clear improvement in cognitive performance
The data collected was conclusive: students exposed to optimized HVAC ventilation performed significantly better on standardized cognitive tests:
-
+23% improvement in reading speed
-
+18% in short-term working memory
-
+30% reduction in midday fatigue
-
-42% fewer complaints related to headaches or feeling stuffy
Teachers also reported fewer interruptions, less conflict, and better classroom behavior management.
Testimonials: when ventilation becomes an educational ally
"Before, my students would literally fall asleep after lunch. Since the air exchanger was installed, the vibe is much more dynamic, and the kids are way more alert," shares Ms. Dufresne, a 4th-grade teacher in Saint-Lambert.
"I used to have headaches by the end of the day. Now I really feel the difference, and I’m sure my students do too," adds a math teacher in Laval.
These testimonials confirm our on-site observations and reinforce our belief that indoor air quality must be central to educational policy.
Why air exchangers are essential in Quebec schools
Quebec’s climate, especially during the long winter months, often limits natural ventilation. That makes it crucial to integrate controlled mechanical ventilation systems that provide a constant supply of fresh air—without sacrificing thermal comfort.
The benefits are numerous:
-
Reduction of CO₂ and humidity levels
-
Elimination of indoor pollutants (dust, allergens, volatile organic compounds)
-
Improved respiratory health
-
Maintaining a learning-conducive environment
Tailored installation designed for schools
At AirGreen, we customize each installation based on the school’s specific needs: classroom volume, occupancy, hours of operation, acoustic and structural constraints. Our certified technicians manage the entire process:
-
Preliminary indoor air quality analysis
-
Selection of the most appropriate air exchanger model (HRV vs ERV)
-
Quiet and safe installation
-
Staff training for proper maintenance
-
Post-installation follow-up with performance reports
Available grants to improve air quality
Government programs such as the Energy Efficiency Assistance Program for Schools help significantly reduce acquisition and installation costs. As specialists, we help you prepare your application and access the best available support in Montreal, Longueuil, Laval, and across the North Shore and South Shore.
Tips for optimal ventilation in schools
-
Avoid low-quality filters: choose MERV 13 or higher
-
Maintain your systems at least twice a year
-
Install CO₂ sensors to adjust airflow in real-time
-
Ensure proper balance between air intake and exhaust
-
Work with a company specialized in school HVAC, like AirGreen
Conclusion: investing in air is investing in the future
The exclusive study conducted by AirGreen proves the critical importance of high-quality ventilation in school settings. Far from a simple technical detail, air quality has a deep influence on students’ attention, performance, and overall well-being. By opting for a high-performance air exchanger, you are tangibly improving the educational environment for your students, teachers, and staff.
At AirGreen, we are committed to transforming schools across Greater Montreal into healthy, efficient, and sustainable learning spaces.