A ventilation error that turned a quiet home into a summer nightmare
When it comes to residential ventilation, some mistakes might seem minor… until the day they create a daily living nightmare. That’s exactly what happened in this single-storey home in Laval, where a poorly configured ventilation system led to a massive invasion of flying insects throughout the summer. At AirGreen, we were called in to diagnose the issue, correct the installation, and most importantly, make the home livable again. This real case proves just how much a poorly designed HVAC installation can impact far more than just thermal comfort.
The context: a renovated home… but a major oversight
This house, located in a quiet residential area of Laval, had just undergone a full renovation, including new insulation, windows, and siding. The homeowner had opted for a simple ventilation setup, with passive exhaust through wall grilles and a small bathroom exhaust fan.
But by June, the occupants started noticing a growing number of flying insects inside: flies, wasps, even winged ants. Despite regular cleaning and window screens, the problem persisted.
AirGreen diagnosis: constant negative air pressure drawing in outdoor air… and pests
Once on site, our team conducted a full analysis of air pressure and the existing ventilation system. The results were crystal clear:
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The air inside the home was constantly under negative pressure, which caused unintentional suction of outside air through every gap (cracks, outlets, light fixtures).
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The passive air vents were poorly placed and unfiltered, allowing air — and insects — to enter freely.
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The bathroom exhaust fan was too powerful for the home’s overall air volume and completely unbalanced the airflow.
In short, the house was functioning like a giant vacuum… pulling in hot outdoor air and all the bugs that came with it.
Our intervention: a new balanced ventilation system
Faced with this diagnosis, we recommended a complete, calibrated HVAC installation, tailored to the size and layout of the home. Our solution:
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Installation of a Venmar AVS N Series HRV, providing balanced airflow with heat recovery.
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Addition of supply and exhaust registers in key rooms, ensuring even air distribution.
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Installation of anti-pollen and insect filters on all air intake points.
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Sealing of specific technical openings where pests were entering with ease.
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Full system calibration according to recommended airflow standards for homes in the Laval region.
Results: goodbye bugs, hello comfort
Just days after installation, the results spoke for themselves:
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Zero insects found in the house, even with windows open.
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Fresher, drier air with no odors in every room.
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Better sleep quality, according to the residents.
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And most importantly, a peaceful summer in Laval — without chemicals or bug traps.
What this situation teaches us
Unbalanced ventilation can have unexpected consequences
People often think poor ventilation only causes thermal discomfort or humidity issues. But it can also open the door to pests, mold, and even building envelope deterioration.
Passive systems are rarely sufficient today
In a well-insulated, modern home, ventilation must be mechanical, controlled, and filtered. Passive systems — often poorly sized — simply can’t manage air exchange effectively, especially in summer.
A professional diagnosis can change everything
At AirGreen, we use precise instruments to measure air pressure, flow rates, humidity, and air quality, allowing us to provide tailored solutions.
Why trust AirGreen in Laval (and beyond)?
✔️ Over 10 years of experience in residential ventilation
✔️ Service coverage across Laval, Montréal, Longueuil, South Shore and North Shore
✔️ Premium equipment and qualified personnel
✔️ Ability to respond quickly — even at the peak of summer
We don’t just install machines. We create healthy, durable, and comfortable living environments.
One small mistake… an entire summer ruined
This Laval case is a reminder that ventilation is a foundational system in any home. It’s not a detail — it’s an invisible pillar of indoor well-being. Thanks to a fast, precise, and tailored intervention, we helped this family regain peace of mind — and peace in their home.
At AirGreen, we don’t let anything through… not even a fly.