A stubborn and invisible problem, yet very real
In the quiet neighborhood of Fabreville in Laval, a couple of homeowners contacted us about a troubling situation: a persistent musty smell was coming from the basement, with no visible source. Despite several attempts to ventilate manually, dry the walls, and use air fresheners, nothing worked. This type of issue, well known in our field, is often the result of a lack of proper mechanical ventilation tailored to the specific needs of the home.
At AirGreen, we’re often called in for delicate missions like this one, where we need to combine precise diagnostics, technical expertise, and tailor-made ventilation solutions. This case in Laval was a perfect illustration of our methodical and professional approach.
The first crucial step: an in-depth diagnostic
Upon arrival, we performed a complete ventilation assessment of the basement and connected living spaces. The result: no mechanical air exchange system had ever been installed in this part of the house. The basement, partially underground and poorly ventilated naturally, was trapping humidity and creating the perfect conditions for mold growth and the appearance of unpleasant odors.
Using our relative humidity meters and a thermal imaging camera, we identified cold zones where condensation was likely, particularly around the foundations. In collaboration with the homeowners, we then designed an action plan to install an efficient, energy-saving, and quiet ventilation system, fully compatible with the home’s existing layout.
A custom solution: installation of a Venmar EVO5 700 HRV air exchanger
After evaluating several options, our team recommended the installation of a heat recovery ventilator (HRV), specifically the Venmar EVO5 700 HRV. This model stood out thanks to its excellent performance in Quebec residential settings, particularly due to:
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A balanced airflow of 700 CFM, enough to cover the entire home.
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A sensible heat recovery efficiency of 80%, minimizing energy loss in winter.
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A quiet operation, a key factor in a semi-living space like a basement.
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An effective MERV 6 filtration system, capturing mold spores and fine particles.
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Eligibility for Hydro-Québec’s LogisVert grant, allowing the homeowners to receive a $600 credit on the installation.
Fast, clean, and efficient installation
The Venmar EVO5 ventilation system was installed over two business days, with no invasive demolition. Our technicians made sure to:
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Route discreet ducts through existing basement walls while preserving the visual appeal.
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Install intake and exhaust vents strategically to optimize airflow.
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Perform a precise calibration of the system, ensuring a consistent air change rate (at 0.3 ACH).
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Train the homeowners on regular maintenance of the system, including filter cleaning and seasonal duct checks.
Immediate and lasting results
In the very first week after installation, the homeowners noticed an almost complete disappearance of the musty smell. The basement air became fresher, drier, and healthier. Three months later, during a follow-up visit, we observed:
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A relative humidity maintained between 42% and 48%, ideal for preventing condensation.
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A significant improvement in air quality, measured with CO₂ and VOC sensors.
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No trace of mold, even in the corners that were previously problematic.
This project perfectly demonstrates the direct impact of a well-designed and professionally installed mechanical ventilation system on comfort, health, and the home’s overall value.
Practical tips: how to prevent odors in your basement
We’re taking this real-world case in Laval as an opportunity to share some useful recommendations for anyone living in a home with a basement on the North Shore:
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Make sure your basement is mechanically ventilated if it’s regularly used as a living space.
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Don’t block vent grilles with furniture or curtains.
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Check humidity levels regularly with a hygrometer (ideal range: 40–50%).
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Clean or replace the air exchanger filters every 3 to 6 months.
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If you notice a persistent smell, call certified HVAC professionals like AirGreen.
Why choose AirGreen for your ventilation needs?
At AirGreen, we specialize in the installation of residential and commercial ventilation systems in Montréal, Laval, Longueuil, the South Shore, and the North Shore. Every project is handled with care and transparency, whether it involves:
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A humidity issue like the one in Laval,
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A code compliance upgrade in an older building,
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Or integrating a high-performance air exchanger into new construction.
We work with trusted brands like Venmar, Lifebreath, Fantech, Aldes, and Broan, ensuring a clean, guaranteed installation that complies with current standards (CSA-F326, Novoclimat, etc.).
Our teams are trained, certified, and equipped to respond quickly throughout the Greater Montréal area, always with the same attention to detail and customer satisfaction.
Conclusion: a ventilation installation, much more than comfort
The case in Laval shows a reality we see too often: lack of proper ventilation can affect indoor air quality, comfort, and even the health of the occupants. Thanks to our intervention, this family now breathes clean air in a healthy home while also reducing their energy footprint.
Are you dealing with humidity, odors, or a ventilation issue in your home in Montréal or the surrounding areas? Trust AirGreen for a complete assessment and a tailor-made solution.
Contact us today for a free evaluation and take advantage of the available grants to improve the air quality in your home.