A Home in Laval Transformed Thanks to a Tailored Ventilation System
In spring, pollen floods the outdoor air… but sometimes it also invades the indoor air. That’s exactly what the Gervais family was experiencing in their Laval home when they reached out to us to resolve an issue that had been affecting their daily lives for years: their children’s seasonal allergies worsened every spring, despite medical treatments and regular home maintenance.
What they didn’t know was that the key to their respiratory comfort wasn’t outside—it was inside their home, within their HVAC ventilation system.
A Complete Diagnostic Carried Out by AirGreen
At AirGreen, we always begin with a comprehensive evaluation of indoor air quality and the efficiency of the existing ventilation system. During our first visit in Laval, we conducted humidity readings, air exchange rate tests, and a full inspection of the ductwork.
The verdict: the home had an outdated, uncertified air exchanger that had not been properly maintained, with an insufficient air renewal rate. As a result, outdoor pollen, dust, mold spores, and fine particles accumulated in the indoor air, worsening allergy symptoms.
Installing a High-Performance Heat Recovery Ventilation System
To provide the family with a lasting and effective solution, we installed a heat recovery ventilator (HRV) from Venmar, model EVO5 700 HRV—a unit known for its high efficiency and quiet operation, ideal for family homes.
Technical specifications of the installed system:
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Model: Venmar EVO5 700 HRV
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Maximum airflow: 700 CFM
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Filtration: MERV 13 filters with optional HEPA
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Thermal efficiency: 75% at -25°C
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Smart controls: Wall-mounted programmable panel with humidity and CO₂ sensors
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Grant eligibility: Qualifies for the LogisVert program (Hydro-Québec)
On-Site Challenges: Adapting a Modern System to an Older Structure
The house, built in the 1970s in Laval, posed several technical challenges. The existing ductwork was poorly routed, with dead zones that caused air stagnation. We had to rethink the air distribution layout, including installing a new network of flexible ducts to reach the basement bedrooms and main living areas.
We also took the opportunity to add a fresh air intake vent in the children’s bedroom, the area most affected by allergens, while integrating an acoustic damper to ensure whisper-quiet operation.
Results Observed Just Days After Installation
Within the first week of use, the family noticed a significant improvement in indoor air quality. The children slept more peacefully, morning sneezing disappeared, and the home felt fresher, with no lingering odors.
According to the father:
“This is the first time in five years that my kids made it through April without antihistamines. We sleep better, we breathe better. Thank you, AirGreen.”
Why Optimized Ventilation Is a Game Changer for Allergy Sufferers
In a city like Laval, where springtime temperature swings promote pollen and mold proliferation, efficient ventilation is more than a comfort—it’s a health necessity.
A system like the Venmar EVO5 offers:
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Continuous filtration of incoming air
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Effective renewal of stale indoor air
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Stable indoor humidity, which helps prevent mold
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Reduction of allergens in the air you breathe daily
Our Tips to Keep Allergens Out of Your Home
Here are some best practices we recommend to all our clients in Laval, Longueuil, Montréal, South Shore, and North Shore:
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Have your HVAC system inspected every 2 years
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Replace MERV 13 or HEPA filters at least every season
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Avoid leaving windows open for long periods during high pollen counts
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Keep indoor humidity between 40% and 50%
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Avoid carpets and rugs if you suffer from allergies
AirGreen: Your Residential Ventilation Expert in Laval
At AirGreen, we know that every home is unique. That’s why we tailor every HVAC ventilation system to your structure, occupancy, and specific needs. Whether it’s a new installation, an HRV/ERV replacement, or indoor air quality diagnostics, our certified technicians guide you every step of the way—with reliable equipment, smart solutions, and tangible results.
We’ve completed numerous similar installations in Laval, especially in Duvernay, Chomedey, and Sainte-Dorothée—homes that have been transformed through smarter ventilation.
Suffering from allergies in Laval or the North Shore? It might be time to upgrade your ventilation. Contact AirGreen for a free, personalized evaluation.