A real-life case that highlights the dangers of a neglected ventilation system
In the urban landscape of Montréal, many condo buildings date back several decades and operate with outdated or poorly maintained HVAC systems. The story we encountered in a condominium in the Rosemont–La Petite-Patrie borough is a striking example of what a failing ventilation system can cost: lingering odours, excess humidity, mould, and emergency repairs that became unavoidable.
At AirGreen, we were called in to resolve a situation that could have easily been prevented with a basic preventive HVAC maintenance plan. This real testimony clearly shows how ventilation plays a fundamental role not just in the residents’ comfort, but also in protecting the building and managing collective expenses.
Context: A Residential Building in the Heart of Montréal
The building in question is a 28-unit condominium built in the 1980s, with a centralized ventilation system connected to each unit. For years, residents had been complaining about:
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Musty and humid smells in the hallways.
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Heavy condensation on the windows inside the units.
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Black mould visible around air vents and in some ceilings.
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A significant increase in heating costs during the winter.
Our Diagnosis: A Completely Clogged HVAC System
From the first inspection, our AirGreen technicians identified several issues:
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The ventilation ducts hadn’t been cleaned in over 10 years.
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The exhaust fans were running at less than 30% of their intended capacity.
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No replacement filters had been installed for at least two years.
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Air circulation was poor, stagnating in the ductwork and redistributing moisture and pollutants throughout the units.
The Financial Consequences for the Condo Syndicate
Due to this negligence, the condo owners faced:
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Emergency mould decontamination work in six units.
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Partial rebuilding of ceilings and walls in affected areas.
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An increase of nearly 20% in the heating budget over two winters.
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Higher insurance premiums due to the assessed health risk.
All told, the combined losses exceeded $48,000 in just 18 months.
Our Intervention: Restoring Ventilation to Full Capacity
Our action plan was rolled out in three key phases:
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Complete cleaning of the ventilation ducts using industrial suction and camera inspection.
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Replacement of all exhaust fans with models offering controlled airflow and low energy consumption.
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Installation of washable HEPA filters and new air grilles in all units.
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Addition of humidity sensors to adjust ventilation in real time based on actual needs.
The result: a ventilation system finally running efficiently, cleaner air, and measurable savings starting from the very first heating season.
Key Lessons for Condos in Montréal, Laval, and Longueuil
This case is far from unique. It reflects a common reality in many condominiums across the North Shore, South Shore, and Montréal: ventilation systems are often overlooked in maintenance budgets until the situation becomes critical. And yet, a well-maintained ventilation system helps prevent:
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Mould and respiratory health issues.
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Material damage caused by excess humidity.
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Disputes between residents due to bad odours or discomfort.
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Financial losses due to expensive emergency work.
Why Trust AirGreen for Your Building’s Maintenance?
For years, we’ve supported condo boards, property managers, and syndicates throughout Greater Montréal. Our services include:
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Custom HVAC maintenance plans, tailored to your building’s age and characteristics.
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Regular inspections with detailed reports, including photo documentation.
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Advice on optimizing energy use, including ventilation performance.
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Complete support to access provincial grants, such as LogisVert or Rénoclimat.
We put our expertise to work for the long-term performance of your systems.
Prevention Is Smarter: A Sensible Choice for Condo Owners
It’s always more economical to schedule annual HVAC maintenance than to fund unforeseen repairs. At AirGreen, we help you implement a simple, clear, and effective routine that protects your residents, your property... and your collective budget.
Conclusion: Ventilation Is Not a Detail—It’s a Pillar of Sustainability
The experience of this Montréal condo clearly shows that neglecting your ventilation can quickly lead to financial losses and widespread discomfort. Thanks to AirGreen’s professional intervention, the system is now optimized, safe, and ready to last for many more years.
Contact us today for a free evaluation of your building’s ventilation system in Montréal, Laval, Longueuil, the South Shore, or the North Shore. At AirGreen, we turn your air problems into long-term solutions.