The invisible consequences of poor ventilation in homes and commercial buildings
In urban areas like Montréal, Laval, Longueuil, the North Shore and South Shore, indoor air quality is a public health issue. While outdoor pollution often takes center stage, poor indoor ventilation is now being flagged in an exclusive study revealing a direct connection with the worsening of chronic respiratory conditions such as asthma, bronchitis, and even certain types of allergic rhinitis. At AirGreen, we see firsthand every week the real impact of faulty ventilation systems — particularly in poorly ventilated homes or buildings equipped with outdated systems lacking heat recovery.
Why is poor ventilation so problematic?
A poorly maintained air exchanger or the absence of a mechanical ventilation system (HRV or ERV) leads to the buildup of household pollutants: excess humidity, mold spores, fine dust, formaldehyde, VOCs (volatile organic compounds), pet dander, and more. These irritating agents penetrate deep into the respiratory system, creating an environment conducive to the development or worsening of chronic illnesses.
We’ve observed, in several recent cases in Brossard, Saint-Eustache, and Rosemont–La Petite-Patrie, families whose children suffered from asthma symptoms resistant to standard treatments. The installation of a heat recovery ventilator (HRV) combined with quality filtration led to a marked improvement in symptoms after just a few weeks.
Exclusive study: poor ventilation and respiratory illness
A recent study commissioned by a coalition of health and building professionals in Quebec reveals that 1 in 3 homes shows humidity or VOC levels above Health Canada recommendations, due to inadequate ventilation. Data collected from over 500 homes between 2023 and 2024 demonstrated a clear statistical link between the lack of effective mechanical ventilation and an increase in medical visits for chronic respiratory issues.
Experts stress the importance of constant indoor air renewal, proper air change rates (minimum 0.3 to 0.5 ACH - Air Changes per Hour), and efficient filtration (MERV 13 or higher), especially in urban environments.
Field testimonial: AirGreen intervention in Laval
In a residential building in Chomedey (Laval) built in the 1980s, an owner contacted us due to recurring condensation and mold issues despite cosmetic renovations. Indoor air analysis, carried out with our certified equipment, revealed high concentrations of mold spores and carbon dioxide in multiple rooms. The cause: an outdated air exchange system, with no sensors or energy recovery.
We proceeded with the installation of a VENMAR AVS N Series air exchanger with a 110 CFM capacity, HVI-certified system, with an integrated MERV 13 filter and digital wall control. The result: a 67% improvement in CO₂ levels and an 80% reduction in odors and signs of humidity after just 4 weeks. The client reported a significant drop in nighttime respiratory symptoms.
Choosing the right air exchanger: essential criteria
Energy efficiency and HVI certification
We only recommend HVI-certified air exchangers, offering heat recovery efficiency above 75%, such as those from the Venmar AVS, Fantech, or Lifebreath lines.
Noise level and adaptability
New models like the VENMAR N Series HRV 130 CFM feature variable-speed ECM motors, operate quietly, and are perfectly suited to tight-space installations common in townhouses in Verdun, Plateau-Mont-Royal, or Boucherville.
Advanced filtration and simplified maintenance
At AirGreen, we offer the option of HEPA filters or activated carbon filters, especially useful in high-density urban zones, near highways or industrial areas. Maintenance is crucial: we recommend filter cleaning every 3 months and a full service by a certified technician annually.
A health-conscious habit: making ventilation part of your wellness strategy
Good indoor air quality is as essential as proper nutrition or sleep. It requires not just a good system, but smart use: programmed schedules, continuous operation in winter, and shutting off recirculation during high outdoor pollution days.
Our technicians are trained to analyze your building’s structure, identify airflow dead zones, offer custom solutions, and ensure installation meets Quebec Building Code standards.
Ventilation and available grants
Did you know that installing a new high-efficiency air exchanger may qualify for Hydro-Québec’s LogisVert subsidies, depending on your income and the nature of the work? At AirGreen, we assist each client with the application process for these programs — a turnkey service that makes a real difference.
Why trust AirGreen?
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We’ve completed over 300 air exchanger installations in the past 24 months, covering homes, daycares, private schools, and urban condos.
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Our interventions are systematically documented with pre- and post-installation air quality analyses, professional photos, and technical reports.
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Our after-sales service is rated 5 stars on Google and Facebook, with a 10-year parts and labor warranty on our recommended installations.
Common mistakes to avoid
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Installing a non-certified or oversized system.
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Neglecting maintenance or blocking ducts during renovations.
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Failing to adjust settings based on seasonal relative humidity.
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Hiring a contractor with no ventilation expertise.
At AirGreen, we frequently correct installation errors made by other providers. Ventilation is a precision trade, and every detail matters when it comes to your health and your family’s well-being.