Improving air quality in a school: a critical mission that we successfully carried out in Longueuil thanks to our expertise in HVAC ventilation systems. This project wasn’t just another contract — it was a direct response to a call for help from a school administration concerned about the health of its students and staff. At AirGreen, we understand that thermal comfort isn’t enough: the air we breathe every day must be clean, healthy, and properly filtered, especially in sensitive environments like schools.
A Longueuil school faced with an invisible but urgent problem
In this particular case, an elementary school in the Vieux-Longueuil sector contacted us after noticing a rise in absences related to respiratory issues. Several teachers and parents had raised concerns: frequent headaches, irritations, fatigue, and even asthma triggered in children who had never experienced symptoms before. The cleaning staff were doing their job diligently. The problem was elsewhere: an outdated and inadequate ventilation system that no longer met the current needs of the building.
Complete technical diagnosis: a custom-tailored service by AirGreen
From our very first visit, our team of HVAC experts conducted a complete indoor air quality assessment in every classroom, the library, the teachers’ lounge, and all common areas. Using specialized sensors, we measured levels of CO₂, relative humidity, fine particles (PM2.5), mold spores, and volatile organic compounds (VOCs). The results were undeniable: the indoor air was overloaded with CO₂, poorly refreshed, and showed excess humidity in certain zones, creating a breeding ground for mold growth.
Our solution: mechanical ventilation with centralized heat recovery
To fix the issue, we recommended the complete installation of a controlled mechanical ventilation system (CMV) with centralized heat recovery. We selected a Venmar EVO5 700 HRV unit equipped with a counterflow heat exchanger, capable of recovering up to 75% of the energy from extracted air, ensuring efficient ventilation without heat loss.
Technical specifications of the installed unit:
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Brand: Venmar
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Model: EVO5 700 HRV
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Airflow capacity: Up to 700 CFM
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Exchanger type: Counterflow (high efficiency)
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MERV 13 filters for enhanced capture of allergens, fine dust, and mold spores
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Built-in CO₂ sensors for automatic adjustment of airflow based on occupancy
A carefully planned project to minimize classroom disruptions
One of the major challenges of this project: carrying out the installation without interfering with class schedules. We planned the work outside school hours, in collaboration with the administration, teachers, and parents. Our technicians worked evenings, weekends, and during a professional development week to carry out:
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Discreet duct installation above drop ceilings,
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Strategic placement of air supply and return vents,
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Commissioning and precise airflow balancing by zone.
Measurable results: a radical change within weeks
Just a few weeks after installation, the results were clearly measurable:
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Average 38% drop in CO₂ levels across classrooms
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Fewer complaints of headaches and fatigue
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Less dust accumulation on desks and surfaces
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Nearly identical energy consumption thanks to the high-performance exchanger
But above all, testimonials from teachers and staff were unanimous: the air felt fresher, lighter, and the children were more focused and less frequently ill.
Why this project stands out on the South Shore
This project in Longueuil is a perfect example of the kind of work we do at AirGreen: a personalized approach, cutting-edge technology, smooth coordination with all stakeholders, and tangible results for occupant health and comfort.
The AirGreen advantage: more than just an installation
In addition to the technical installation, our intervention included:
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Training for maintenance staff on filter replacement and basic upkeep
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A remote monitoring system with automatic alerts in case of air quality changes
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Recommendations for annual HVAC maintenance to ensure system durability and efficiency
Grants available for this type of installation
Although this project was funded by the school board’s budget, it’s important to note that provincial and federal grants are available for educational institutions or public buildings looking to improve indoor air quality. Our experts guide each client through the process to maximize their eligibility for programs such as:
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Hydro-Québec’s LogisVert program (conditions apply)
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Green Renovation Support Program (Government of Quebec)
AirGreen: your HVAC ventilation partner in Longueuil and throughout the South Shore
Whether for educational, institutional, or residential projects, we serve Longueuil, Brossard, Saint-Lambert, Boucherville, and across the South Shore to provide HVAC ventilation solutions that are sustainable, tailored, and high-performing.
Our team is made up of certified technicians, specialized engineers, and attentive project managers, capable of transforming workspaces, classrooms, or homes into healthy, comfortable environments.