An air exchanger breakdown may seem minor… until the stale air builds up, mold threatens, and indoor comfort becomes unbearable. This story, based on a real intervention by our team at AirGreen, perfectly illustrates how a sudden failure can quickly spiral out of control – and, more importantly, how a quick and expert intervention helped avoid much worse consequences.
A Typical Day That Turned Into a Disaster
It was 8 a.m. in a single-family home located in Laval when we received an emergency call. The client – a worried father – reported a persistent smell of dampness, a heavy air sensation, and a ventilation system that wasn’t responding at all. Their Venmar EVO5 500 HRV air exchanger, installed just over 10 years ago, had completely stopped working. The system refused to start, despite several manual restart attempts.
Rapid Identification of the Problem by Our AirGreen Team
Upon our arrival, we conducted a full diagnostic of the HVAC system. Our certified technicians immediately checked:
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The electrical power supply to the unit
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The status of the blower motor
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The pressure sensors and filters
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The wall-mounted control panel and internal wiring
Verdict: The main motor was fried, most likely due to an undetected thermal overload caused by the old sensors. Additionally, the filters were excessively clogged, which had likely caused prolonged overheating.
The Dilemma: Repair or Replace the Air Exchanger
In such cases, it’s crucial to weigh the repair cost against the replacement cost. Since the model in question was nearing the end of its useful life and didn’t meet the new energy efficiency standards, we recommended an immediate replacement.
We suggested a Venmar AVS N Series 120 CFM HRV air exchanger, a high-performance unit, compliant with ÉNERGUIDE and ENERGY STAR standards, and most importantly, eligible for Hydro-Québec’s LogisVert subsidy for North Shore homes.
The Technical Challenges of Installation
The installation was not without its challenges. Here’s what we encountered:
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Limited access to the attic, where the old exchanger was installed.
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Rigid 6-inch ducts that required partial resizing to fit the new unit.
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Reconfiguration of the condensation drainage system, as the new model has a dual-drain system for optimal drainage.
Our technicians proceeded step-by-step:
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Safe removal of the old system without damaging the attic insulation.
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Installation of anti-vibration mounts to reduce noise and extend the unit’s lifespan.
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Replacement of the wall-mounted control panel with a compatible digital model.
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Full airflow checks, calibration, and system start-up.
Results: Comfort Restored, Health Protected
In less than 4 hours, the new system was operational. The immediate results were remarkable:
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Significant reduction in indoor humidity
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Eliminated musty odors
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Consistent airflow in every room
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Improved air quality, confirmed by CO2/HR sensors temporarily provided by our team
The client, relieved, praised the speed and transparency of our service. In addition, we assisted the client in submitting their request for the LogisVert subsidy, amounting to $590 for this air exchanger model.
Why an Air Exchanger is Vital in Our Homes in Quebec
In areas like Montréal, Laval, Longueuil, North Shore, and South Shore, homes are increasingly sealed to improve energy efficiency. However, without mechanical air renewal, this creates an unhealthy environment:
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Accumulation of indoor pollutants
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Stagnant moisture
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Mold growth
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Increased risks for people with asthma or allergies
A high-performing air exchanger like the Venmar AVS N Series not only improves comfort but also preserves the building’s structure and protects the health of its occupants.
Practical Tips to Avoid an Air Exchanger Breakdown
At AirGreen, we recommend the following steps:
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Change the filters every 3 months, or more often if you have pets
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Have professional maintenance every year
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Visually check the airflow from the vents
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Never block the intake or exhaust grilles
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Listen for unusual noises, which often signal a motor or pressure issue
Why Choose AirGreen for Your Air Exchanger Needs
We don’t just sell equipment. At AirGreen, we offer tailored solutions suited to your home, ventilation needs, and budget. Every intervention is documented, tested, and guaranteed. Our expertise in HVAC residential and commercial systems throughout Montréal, Laval, Longueuil, North Shore, and South Shore makes us a trusted partner for your air exchanger installation or replacement projects.
An Exemplary Intervention, A Satisfied Customer
This real case in Laval demonstrates the importance of having a qualified, responsive, and honest team by your side. Without a quick intervention, this situation could have led to:
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High contamination costs
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Increased respiratory health risks
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Premature building deterioration
Thanks to our professionalism, our thoroughness, and our proximity, we avoided the worst.
Conclusion
An air exchanger failure is not just a minor inconvenience: it’s a structural and health risk. Fortunately, with a swift intervention, trained technicians, and carefully selected devices, it is possible to turn a potential disaster into a long-term improvement in your quality of life.