Clean air, present students: when ventilation becomes a driver of academic success
The importance of air quality in Québec’s public schools is no longer up for debate. Yet many schools in Montréal are still operating with outdated ventilation systems that are poorly suited to current public health requirements and educational performance goals. At AirGreen, we recently carried out an HVAC renovation project in a downtown Montréal elementary school. The results were clear: a significant drop in absenteeism, improved comfort for students and staff, and major gains in energy efficiency.
An alarming situation in many Montréal schools
Many school buildings were constructed before the 1980s, at a time when centralized mechanical ventilation wasn’t mandatory. The consequences:
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Stagnant, polluted air in classrooms.
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High CO₂ levels, leading to headaches, drowsiness, and reduced concentration.
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Proliferation of allergens and mold in poorly maintained ductwork.
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Frequent absences due to recurring respiratory infections among students and staff.
In this context, it’s clear that upgrading HVAC systems in schools is not an expense, but a strategic investment in health and academic success.
AirGreen case study: transformation of an elementary school in the Villeray borough
Our task: replace a partial ventilation system with a complete HVAC solution that is quiet, efficient, and energy-saving, in an elementary school with 18 classrooms and 420 students.
Technical solutions implemented:
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Installation of three Lennox HRV air handling units, each with high-efficiency heat recovery (80%).
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Addition of low-noise diffusers designed specifically for school environments.
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Integration of intelligent CO₂ and humidity sensors to automatically adjust airflow in real time.
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Modernization of the control system through a centralized connected interface.
Results observed over 12 months:
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23% reduction in student absenteeism.
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Less fatigue reported by teachers, better student focus.
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Improved perception of thermal comfort in 90% of classrooms.
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27% reduction in carbon footprint thanks to energy recovery.
Why ventilation is critical in school environments
Respiratory health and child wellbeing
Children spend more than six hours a day in class. Inadequate ventilation increases their exposure to fine particles, airborne viruses, and mold, aggravating asthma and allergies. Our HVAC systems ensure constant air renewal, with HEPA filters for optimal air quality.
Better focus, less fatigue
Studies show that high CO₂ levels (>1,500 ppm) impair focus and increase fatigue. Thanks to smart regulation systems, we keep levels below the recommended 1,000 ppm, creating a learning-conducive environment.
Compliance with standards and available grants
HVAC renovation projects in school buildings are often eligible for subsidies from the LogisVert program or provincial infrastructure investments. AirGreen assists clients with writing and submitting grant applications, with a high success rate.
Common mistakes to avoid in school HVAC renovations
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Installing non-centralized ventilation systems, leading to uneven airflow between classrooms.
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Ignoring acoustic analysis, which is essential in learning environments.
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Choosing equipment without modulation capability, causing excessive energy use.
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Neglecting regular preventive maintenance, which reduces efficiency over time.
Our AirGreen approach: precision, understanding, performance
At AirGreen, we know that every school has its architectural, budgetary, and educational constraints. That’s why we offer:
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Free thermal audits, conducted in partnership with school boards.
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Custom solutions, scheduled around school calendars to minimize disruption.
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Post-installation monitoring, including performance reports, seasonal adjustments, and proactive maintenance.
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An experienced team trained to work in occupied environments without disrupting classes.
Conclusion: a new era for school ventilation in Montréal
Upgrading HVAC systems in public schools is more than a technical project. It’s a comprehensive approach that supports educational achievement, child health, and public well-being. Through installations like the one completed in Villeray, AirGreen proves that innovative ventilation can truly transform the school environment.