The invisible consequences of poor ventilation: what we discovered in 100 homes across Montréal
At AirGreen, we recently conducted a comprehensive study on residential ventilation quality in Montréal, inspecting over 100 homes located in various boroughs of the city. Our goal? To assess the real-world impact of ineffective ventilation systems on occupant comfort, health, and energy bills. The results are revealing—and in some cases, alarming. This article dives into the detailed findings from our field investigation, while offering practical advice and real solutions.
Why is ventilation so critical in a home?
A reliable mechanical ventilation system doesn’t just circulate air: it plays a vital role in indoor air quality, moisture control, and mold prevention. In Montréal, where seasonal climate swings are significant, a high-performance air exchanger is essential to maintain stable thermal comfort, especially in winter.
Yet, many Montréal homes still rely on outdated, poorly maintained, or even non-existent systems—compromising not only residents’ health, but the building's structural integrity.
Results from our field study: 100 homes analyzed, with striking findings
Outdated and neglected systems
Among the 100 homes visited:
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78% were using air exchangers over 10 years old, with the majority no longer meeting current energy efficiency standards.
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62% had a buildup of dust, debris, or mold in the ductwork, significantly reducing system performance.
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45% had insufficient airflow, preventing proper air renewal.
Impact on health and comfort
We interviewed the occupants of these homes, and their feedback matched our technical observations:
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40% suffered from frequent respiratory symptoms (rhinitis, coughing, allergies).
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28% reported persistent humidity issues, especially in basements and bathrooms.
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35% described the air inside as stale or stuffy, particularly during winter months.
These numbers clearly show that neglected or inefficient ventilation systems have a direct impact on daily well-being.
Case Study: A family in Villeray suffering from poor ventilation
In a typical Villeray duplex, a family of four was dealing with recurring mold issues despite repeated cleaning efforts. Our team discovered a malfunctioning Venmar air exchanger, over 20 years old, with a seized motor and ductwork completely blocked.
We replaced it with a Fantech VHR 150 R model, a high-performance heat recovery ventilator (HRV) that’s energy-efficient and quiet. The results? Mold disappeared completely within three weeks, the whole family noticed a significant improvement in air quality, and their electricity bill dropped by 10% after three months.
What you risk with an ineffective ventilation system
Here’s what we found throughout our inspections:
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Increased energy consumption: A clogged air exchanger puts extra strain on heating and cooling systems.
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Structural damage: Uncontrolled humidity leads to leaks, mold growth, and long-term deterioration.
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Lower property value: Poorly ventilated homes are far less appealing on the real estate market.
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Higher risk of allergies and respiratory illnesses.
AirGreen solutions: how we fix the problem
At AirGreen, we offer a comprehensive approach to HVAC installation and maintenance, which includes:
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Full inspection of existing ductwork and air exchanger systems.
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Professional cleaning and disinfection of ductwork.
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Replacement with certified Energy Star energy-efficient models.
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Intelligent integration with central heating systems for optimal climate regulation.
We work with leading brands such as Venmar, Fantech, Lifebreath, Aldes, and we select the best model based on your home’s square footage and needs.
Professional installation across North Shore, South Shore, Montréal, Laval and Longueuil
Our teams operate quickly throughout Greater Montréal:
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On the North Shore, including Blainville, Terrebonne, Laval, and Sainte-Thérèse, where we often see high winter condensation levels due to missing ventilation.
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On the South Shore, in Longueuil, Brossard, and Saint-Hubert, where many bungalows still have outdated, non-compliant air exchangers.
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In Montréal, in areas like Rosemont, Outremont, and the Plateau, where older triplexes pose unique installation challenges we handle with expertise.
Maintenance matters: a habit you shouldn’t skip
Even the best air exchanger will quickly lose efficiency without regular maintenance. We recommend a full cleaning every two years, including:
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Dusting and cleaning of filters.
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Motor inspection.
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Airflow verification and system calibration.
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Cleaning or replacement of wall vents.
Our expert tips for effective home ventilation
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Never block ventilation grilles: they’re essential for airflow.
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Check the age of your air exchanger: over 10 years? Time for a replacement.
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Invest in a certified HRV or ERV system, tailored to our Québec climate.
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Hire a professional installer: poor installation cancels out the benefits of a good system.
AirGreen, your ventilation partner for over 10 years
For more than a decade, we’ve helped families and businesses optimize their HVAC and ventilation systems. Our local expertise, transparency, and commitment to quality set us apart in the industry.
Our study of 100 homes in Montréal proves one thing: neglecting ventilation leads to steep costs in the long run. Have your system inspected today and give your family clean, balanced, healthy air year-round.