A device meant to save you money… that’s quietly costing you instead
In many homes across Montréal, Laval, Longueuil, and on the North Shore and South Shore, the HRV (Heat Recovery Ventilator) is presented as a cornerstone of energy efficiency. In theory, it refreshes indoor air while recovering heat from outgoing air. But what most homeowners don’t realize is that thousands of HRV systems, poorly calibrated or maintained, actually consume more energy than they save. At AirGreen, we’ve seen countless cases where a poorly optimized HRV becomes a constant, invisible source of energy waste.
A false sense of savings
The concept behind the HRV is simple: exhaust stale indoor air, draw in fresh outdoor air, and transfer heat between both airflows via a thermal core. But this system becomes counterproductive if even one element is neglected:
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Blocked or poorly insulated ducts
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Dirty or low-grade filters
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Unbalanced airflow
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Unnecessary continuous ventilation in unused zones
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No humidity sensor or timer control
In all these cases, your HRV ends up losing energy, burning electricity while delivering no real benefits.
Real case study in Montréal: a running HRV… that does nothing
During a recent inspection in a century-old home in Plateau Mont-Royal, our technicians found a Lifebreath HRV running 24/7… but the entire circuit was unbalanced. No extraction from the bathroom, a clogged filter from 2019, and a torn duct in the attic. The result: persistent humidity issues and roughly $40 per month in electricity wasted—with no air quality improvements.
After replacing the filter, balancing the airflow, and sealing the damaged duct, the system was finally restored—and the electricity bill dropped by 30%.
Why are so many HRVs inefficient in Montréal?
Montréal is filled with old housing stock. And century-old homes, multiplexes, and triplexes were never designed to accommodate mechanical ventilation systems. Often, contractors install HRVs without any prior diagnostics or airflow balancing. The result:
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Fresh air drawn in without heat actually being recovered
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Overpressure or underpressure in various rooms
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Cold drafts in winter
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Stagnant humidity in areas not covered by the system
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Noisy, underperforming units
At AirGreen, we’re frequently called to homes in Villeray, Rosemont, and Hochelaga-Maisonneuve, where HRVs were installed with little to no system integration—causing more trouble than comfort.
How do you know if your HRV is wasting energy?
Here are the most common signs:
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You don’t feel any real airflow despite the system running
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Your unit is noisy but doesn’t seem to make a difference
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Persistent condensation (bathrooms, windows)
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Indoor air feels too dry or too damp
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You own a unit that’s never been serviced since installation
If you’ve noticed any of these, a free inspection visit by our specialists could save you hundreds of dollars annually.
Examples of AirGreen service calls across Greater Montréal
Longueuil (Saint-Hubert sector)
A homeowner complains about persistent odors in their bungalow. Their Venmar HRV has been running for 12 years without maintenance. Diagnosis: missing filter, dust-covered motor, closed extraction grilles. Outcome: energy overconsumption, excessive noise, poor results. We cleaned the system, replaced faulty parts, and recalibrated the unit. The air became fresh again, and the electricity bill dropped.
Laval (Fabreville)
In a two-story home, a Fantech HRV installed in the attic is loud and ineffective. Our analysis: uninsulated ducts with massive heat loss. Our technicians reinsulated the entire line, added a programmable humidity sensor, and significantly improved the home’s comfort.
North Shore (Blainville)
A customer complains their HRV is blowing cold air into the bedrooms. The original installation had no balancing dampers at all. The result: reversed airflow and thermal discomfort. Our solution: installed balancing dampers, recalibrated the system, and added a wall-mounted timer for targeted ventilation.
Our recommendations to avoid energy waste
1. Have your HRV inspected every 12 to 18 months
Regular maintenance ensures filters, ducts, and internal parts are in top shape.
2. Install a smart controller
A humidity sensor or programmable timer prevents the system from running when it doesn’t need to.
3. Get airflow balanced
Systems must be perfectly balanced between extraction and fresh air supply. Mismatched airflow creates pressure issues.
4. Avoid cheap filters
Non-MERV-certified filters let particles through, overwork the motor, and degrade air quality.
5. Make sure ducts are insulated
Uninsulated metal ducts in the attic freeze in winter, creating condensation and major heat loss.
Why choose AirGreen?
At AirGreen, we don’t just sell HVAC equipment. We specialize in optimizing existing systems, especially HRVs installed in complex environments, like Montréal triplexes or poorly ventilated older homes.
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Our technicians are certified, experienced, and equipped to deliver accurate diagnostics
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We offer targeted solutions without unnecessary equipment replacements
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We provide free, no-obligation visits throughout Montréal, Laval, Longueuil, the North Shore, and South Shore
AirGreen: HVAC expertise in Montréal that transforms energy-hungry systems into efficient, silent solutions.