Behind apparent savings, a real health risk
In Montreal, more and more homeowners are looking to improve their home’s ventilation for reasons of comfort, health, or energy efficiency. But in a market flooded with bargain-basement offers, it’s easy to fall into the trap of low-cost installations, which are often poorly designed, poorly installed, and not up to HVAC standards. That’s exactly what happened to a family in the Rosemont neighborhood—a case that perfectly illustrates the hidden dangers behind deals that seem too good to be true.
A rushed installation… and unbreathable air
The story begins with a Montreal couple who had recently renovated their duplex. Wanting to ensure proper air renewal, they opted for a ventilation system installation by a contractor offering rock-bottom prices. Less than a year later, the consequences became clear: mold in the corners of the ceilings, excessive condensation on the windows, and most worryingly, respiratory problems in their young child.
At their request, AirGreen was brought in to conduct a full diagnostic of the ventilation network. The results: an undersized system, poorly insulated ductwork, and most importantly, no effective filtration against fine particles or mold spores.
A textbook case of an installation unsuited to Quebec’s climate
The system used was a generic imported model, with no CSA or AHRI certification. The ductwork had been installed without proper drainage slopes, resulting in moisture build-up inside the ducts. Additionally, no air exchanger had been included, and the central unit operated in extraction mode only, with no intake of fresh air.
Our technicians also discovered advanced fungal contamination in the ducts, making the entire network unusable without full decontamination.
The AirGreen intervention: restoring healthy, efficient, and durable ventilation
Given the scale of the problem, we recommended a complete overhaul of the ventilation system. Here’s what our team did in Montreal:
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Removed the defective old system, safely disposing of the contaminated ductwork.
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Installed a heat recovery air exchanger (HRV) certified by CSA, with MERV 13 filters.
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Added insulated double-walled ductwork, with humidity control and balanced airflow.
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Integrated an intelligent monitoring system, allowing real-time tracking of indoor air quality and filter status.
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Implemented an annual maintenance plan with automatic alerts to ensure long-term system performance.
Just one week after installation, the benefits were already felt: no more musty odors, a drastic reduction in condensation, and a significant improvement in the child’s breathing.
The false savings of bargain-basement ventilation systems
This case is far from unique. In several Montreal boroughs—Hochelaga, Villeray, and Côte-des-Neiges among them—we’ve seen a spike in corrective work caused by systems hastily installed by unlicensed contractors.
These low-cost systems may represent up to 40% savings at the time of purchase, but they often generate maintenance, repair, or replacement costs up to three times higher within the first five years.
At AirGreen, we believe that a well-thought-out HVAC ventilation investment, suited to Quebec’s climate realities, is the only rational choice to ensure health, energy performance, and long-term durability.
How to avoid critical mistakes when choosing a ventilation system
Here are our essential recommendations for Montreal homeowners looking to install or upgrade their ventilation:
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Check equipment certifications (CSA, AHRI).
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Request a full system sizing assessment, tailored to the volume of your home.
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Make sure the installation is carried out by a certified HVAC contractor, with a valid RBQ license.
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Request air quality testing before and after installation, especially if there are ongoing health issues in the household.
AirGreen: a trusted name in ventilation across Montreal
As a local company specializing in HVAC ventilation, we put our expertise to work for families in Montreal, Laval, Longueuil, and on the North and South Shores. Every project we take on is well-documented, transparent, and compliant with the industry’s strictest standards.
We work on both residential and commercial projects, with a strong focus on indoor air quality, energy efficiency, and long-term customer satisfaction.
Conclusion: make the right choice today, enjoy peace of mind tomorrow
This case in Rosemont reminds us that when it comes to ventilation, price should never be the only deciding factor. A poorly designed or poorly installed system can turn your home into an unhealthy environment.
Trust AirGreen for installations that are reliable, efficient, and built with your long-term well-being in mind. In Montreal and throughout Greater Montreal, we make your air our priority.