A custom ventilation installation that ended years of discomfort and damage
Excess humidity is a well-known issue for homeowners in Longueuil, as well as in Montréal, Laval, the South Shore, and the North Shore. It causes not only aesthetic problems, like mould stains, but also health risks and structural damage. At AirGreen, we were contacted by the Morel family, who had been dealing with a recurring humidity issue that resisted every conventional solution. This case, right in the heart of Longueuil, perfectly illustrates how a professional HVAC installation, well-designed and well-executed, can make all the difference.
The Problem: Constant Humidity Despite Renovations
For over eight years, the Morel family had lived in a typical two-storey home in the Vieux-Longueuil neighbourhood and faced a frustrating situation: despite several renovations, the humidity kept coming back. The signs were obvious:
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Condensation on windows as soon as temperatures dropped
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Musty odours in the laundry room and basement
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Mould stains on ceiling corners and along baseboards
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A humidity level exceeding 70%, according to their hygrometer
Their ventilation setup consisted only of bathroom fans and a kitchen range hood, clearly insufficient to regulate the home’s indoor air.
First Step: Complete Diagnosis by AirGreen
When the Morel family contacted us, we performed a comprehensive technical analysis of the home’s ventilation and air quality:
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Room-by-room humidity testing
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Inspection of existing ductwork
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Air pressure and airflow stagnation checks
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Energy audit of overall air circulation
The conclusion: the house suffered from a lack of air exchange, worsened by high-performance insulation with poor ventilation. Humid air remained trapped inside, fuelling mould growth and general discomfort.
The AirGreen Solution: A High-Efficiency HRV Adapted for Longueuil
We recommended installing a Heat Recovery Ventilator (HRV) — the Lennox Venmar AVS S10, perfectly suited for Longueuil’s climate and the specific needs of the Morel home.
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Brand and model: Lennox Venmar AVS S10
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Capacity: 110 to 160 CFM, depending on the mode
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Filtration: washable MERV-8 filter + HEPA filter option
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Energy efficiency: up to 84% heat recovery
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Wall-mounted digital control with auto, humidity, night, and away modes
We also added extraction grilles in high-moisture areas (bathroom, laundry room, basement), and air supply vents in living areas to ensure perfect air balance.
A Fast, Damage-Free Installation
Our technicians completed the entire installation in two days, without altering the home’s interior aesthetics:
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Ducts routed through attics and false ceilings
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Discreet integration of ventilation grilles
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Full system startup, tuning, and air balancing
The job was completed with minimal disruption to the family’s daily life, which is essential for homeowners living onsite during work.
The Results: A Radical and Lasting Transformation
Just one week after the installation, the results were clear:
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Humidity stabilized at 45% constantly, with no additional dehumidifiers
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Gradual disappearance of musty odours and mould stains
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Significant overall comfort improvement, with drier, cleaner, and fresher air
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Reduction in window condensation, even during cold spells
Air quality tests done two weeks later confirmed a 58% drop in VOC (volatile organic compound) concentrations and a significant reduction in fine particles.
Energy Savings and Local Grants
The installed system allows the Morel family to cut their heating consumption, as incoming air is preheated through thermal recovery. On top of that, thanks to the LogisVert program, the installation qualified for a $960 grant, reducing a substantial portion of the total cost.
AirGreen Maintenance Tips and Recommendations
To ensure optimal performance over time, we advised the family to:
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Clean or replace filters every 3 months
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Monitor indoor humidity with a reliable hygrometer
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Schedule annual HVAC maintenance, especially to check damper operation and duct cleanliness
We also provided a full user guide so every family member could make the most of the system’s different operating modes.
Testimonial from the Morel Family: “We Got Back the Comfort We Thought Was Lost”
“For years, we felt like our house was just too humid. We even considered moving. Thanks to AirGreen, everything changed. Not only is the air healthier, but we finally feel good in our own home. The team was attentive, professional, and the solution was perfectly tailored to our situation.”
Why Trust AirGreen for Your Ventilation Projects in Longueuil
At AirGreen, we know that every home is unique, just like the needs of its occupants. That’s why we approach each project with technical expertise, careful listening, and a fully personalized strategy. Whether you're in Longueuil, Boucherville, Montréal, or Laval, our team will support you from start to finish with your residential and commercial ventilation projects.
Don’t let humidity or poor ventilation compromise your quality of life. Contact AirGreen today.