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How to Avoid the Costly Pitfalls of Poor Air Exchanger Installation in Montréal

A flawed installation can cost far more than a good system

At AirGreen, we’ve seen far too many homes in Montréal, Laval, Longueuil, as well as on the North Shore and South Shore, struggle with humidity issues, condensation, lingering odors, or poor indoor air quality—even though the homeowners thought they made the right decision by installing an air exchanger. Often, the problem doesn’t come from the model itself, but from how the system was installed.

A poor installation can not only cancel out all the expected benefits, but also lead to costly repairs, higher energy bills, or long-term health consequences. Here are the main pitfalls to avoid—and how we at AirGreen ensure flawless installations.

Signs of a faulty installation: what we see every day

There are several indicators that can alert a homeowner something is off with their ventilation system:

  • Excess condensation on windows

  • Mold in corners or around window frames

  • Lingering odors in certain rooms despite ventilation

  • Feeling of air that’s too dry or too humid, depending on the season

  • Unusual noises, vibrations, or whistling when the system turns on

  • Uneven temperatures between rooms

All these problems are common when the air exchanger is installed hastily, without proper balancing, or simply by a company that lacks real residential HVAC expertise.

Case Study: A Griffintown condo turned into a damp greenhouse

We were recently called in for a recurring humidity issue in a modern apartment in Griffintown. The client, a young professional, had an air exchanger installed when the building was built. Still, he was dealing with mold under the windows and a persistent smell in the bathroom.

Our diagnosis:

  • The unit, a Venmar EVO5 500 HRV, was poorly connected: stale air was being expelled into a false ceiling, not outdoors.

  • No airflow balancing had been performed.

  • The humidity sensor wasn’t configured, meaning the ventilation was inactive half the time.

We carried out:

  • A complete ductwork revision, redirecting the exhaust outdoors

  • Full pressure testing, adjusting both intake and exhaust airflow

  • Installation of a programmable smart controller, adapted to the client’s lifestyle

Result: no more mold, improved air quality, and an 18% reduction in electricity bills over three months.

Why the installation matters more than the brand

An air exchanger—whether it’s from Venmar, Vanee, Broan, Lennox, or another brand—can only deliver on its benefits if it’s properly installed and calibrated. Even a top-of-the-line model is useless if installed poorly.

At AirGreen, we follow a strict methodology:

  • Detailed building analysis: living area, number of floors, humid areas

  • Strategic placement of intake and exhaust vents

  • Precise airflow balancing using an anemometer

  • Static pressure control, to avoid overpressure or underpressure in the home

  • System configuration based on the season and client preferences

This approach not only prevents unpleasant surprises, but also ensures that the system runs at its optimal efficiency, requiring minimal HVAC maintenance and offering long-term energy savings.

Common installation mistakes to avoid

We often encounter the following mistakes made by non-specialist contractors:

  • Connecting the air exchanger to the kitchen hood duct

  • No fire dampers in walls where ducts pass through

  • Installing the unit in an unheated space (risk of freezing)

  • Ducts that are too long, with no fan power adjustment

  • No easily accessible maintenance panel

  • No indoor humidity check, even in winter

These errors are problematic not just for system performance, but also for compliance with building codes.

Practical tips for a successful project

To ensure your air exchanger installation brings real benefits, we recommend:

  1. Hire a company that specializes in residential HVAC

  2. Demand full documentation of the system (model, airflow, configuration)

  3. Request a post-installation balancing test

  4. Install a user-friendly control panel with both automatic and manual modes

  5. Plan for an annual maintenance contract to keep the system efficient

AirGreen: our commitment to long-term, reliable installations

Every week, our teams operate across Montréal, Laval, Longueuil, the North Shore, and the South Shore to:

  • Fix faulty installations

  • Optimize existing systems

  • Perform adjustments on previously installed units

  • Train clients for smart, energy-efficient usage

Our goal: for every air exchanger we touch to run efficiently, quietly, and reliably—and above all, to genuinely improve indoor air quality.

Conclusion: investing in the installation means investing in peace of mind

An air exchanger is a crucial part of any modern residential HVAC system. But to deliver on its promises, the installation must be done with precision and expertise.

At AirGreen, we believe quality starts with the details. That’s why we put all our expertise at the service of Montréal families—to avoid costly mistakes… before they happen.

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