When air quality becomes a silent threat: the warning signs too many families in Montréal are ignoring
In many homes across Montréal, Laval, Longueuil, North Shore and South Shore, ventilation systems—especially ERVs (Energy Recovery Ventilators)—are installed to maintain optimal air quality and limit energy losses. However, an aging or malfunctioning ERV can seriously impact indoor air quality without you even realizing it. At AirGreen, we are frequently called in to diagnose and replace failing ERVs—often after the early warning signs were overlooked. Here are 5 subtle but critical signs that your ERV needs to be replaced immediately.
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A persistent musty or damp smell in the house
An ERV’s primary job is to maintain a stable humidity level by efficiently renewing indoor air. If you begin to notice unpleasant odors in certain rooms—especially basements or bathrooms—it’s likely a sign that the system is no longer evacuating humidity properly. In one client’s home in Longueuil, we replaced a 12-year-old ERV that, despite appearing functional, was no longer refreshing the air adequately. The result: within one week of installing the new Zephyr VRE-150 model, the odor was completely gone.
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Excess condensation on windows even in winter
Seeing regular condensation inside your windows—especially during winter—is a clear sign that the humidity level is too high. This usually means your ventilation system isn’t balancing the moist indoor air with dry outdoor air. We recently worked in Laval, where condensation was becoming so severe that it caused window frames to swell. Replacing the old unit with a Lifebreath VRE 195 ECM, Energy Star certified, resolved the issue within 48 hours.
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Worsening allergies or respiratory issues
An outdated or clogged ERV can become a source of pollutants, mold spores, or fine dust particles. Several families we’ve helped in Montréal described frequent symptoms (headaches, congestion, irritation) without any identifiable cause. After replacing their ERV, their health improved significantly. It's crucial to replace an old air exchanger to maintain a healthy environment.
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Unusual mechanical noises and a fan that seems to struggle
A well-maintained ERV should operate quietly. If you hear grinding, knocking, or if the unit seems to be straining, it likely means the motor, bearings, or fan blades are worn out. In a North Shore home, the ERV noise was so loud that the residents couldn’t sleep. We replaced the old unit with a Venmar EVO5 500 HRV, which is quiet, powerful, and highly energy efficient. Acoustic comfort was restored immediately.
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Rising heating or cooling bills with no changes in usage
An aging ERV often loses energy efficiency. It no longer properly transfers heat between incoming and outgoing air, forcing your heating or cooling systems to work harder. In Boucherville, one client saw their electricity bill drop by 17% after upgrading from an old unit to a Fantech VRE704, engineered for Quebec’s harsh climate.
What you risk if you delay replacing your ERV
Ignoring these warning signs can lead to structural damage, poor indoor air quality, and even chronic health issues for your household. A failing ERV isn’t just an inconvenience—it directly compromises your home’s air safety. We’ve seen cases where waiting too long resulted in hidden mold developing behind walls or under floors.
How to know if replacement is necessary: our approach at AirGreen
At AirGreen, every service call starts with a comprehensive system evaluation:
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Real airflow measurement.
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Visual inspection of filters, ductwork, and electrical connections.
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Indoor humidity level readings.
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Assessment of overall energy performance.
We use professional diagnostic tools to detect all issues, and our recommendations are always transparent and data-backed.
Our recent ERV replacements in Montréal and surrounding areas
Here are some recent examples of replacements we completed:
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Montréal (Ahuntsic): swapped out an outdated model for a Lifebreath RNC5-ES with built-in bypass.
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Sainte-Julie: multigenerational home with two ventilation zones—custom solution with two Venmar AVS ERVs.
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Laval (Chomedey): express replacement in a rental duplex, including duct cleaning and system balancing.
Why choose AirGreen to replace your ERV?
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Recognized HVAC expertise: we specialize in HVAC installation, HVAC maintenance, and replacement of high-efficiency equipment.
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Energy Star certified products: all units we offer are designed for Quebec’s tough climate.
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Fast, precise service: full diagnostic in 48 hours, installation in just one day.
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Grant assistance: we help you apply for incentives like Hydro-Québec’s LogisVert program.
Conclusion: An ERV doesn’t last forever—don’t ignore these signs
Replacing an ERV isn’t a luxury—it’s a necessity to preserve the health, comfort, and energy efficiency of your home. If you notice any of the warning signs mentioned above, don’t wait for things to get worse. At AirGreen, we replace hundreds of air exchangers each year throughout Greater Montréal, delivering lasting, measurable results. Don’t take unnecessary risks—your family’s comfort and well-being depend on it.