Indoor air: an underestimated issue at the heart of urban living
In a densely populated urban environment like Montréal, new modern condos are designed for energy efficiency, thermal insulation, and airtight construction. While these features seem beneficial at first glance, they often turn into an invisible but very real problem: indoor air pollution. At AirGreen, we’re called in daily to correct a hidden imbalance in these buildings — indoor air that’s more polluted than the outdoor air.
Why modern condos worsen indoor pollution
Enhanced insulation: an invisible trap
New buildings in Montréal — particularly condos in downtown, Griffintown, the Plateau, or even Rosemont — are built under strict energy-efficiency standards. As a result, outdoor air barely gets in, and indoor pollutants build up fast. In the ambient air, we often find:
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Volatile Organic Compounds (VOCs) from construction materials, paints, adhesives, and new furniture.
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Formaldehyde from laminate flooring or MDF panels.
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Fine particles from cooking, heating, or smoking.
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Mold caused by poorly managed humidity.
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Elevated CO₂ levels due to lack of natural ventilation.
In many of the units we visit, air quality is so poor that residents experience chronic headaches, fatigue, or respiratory issues without realizing that their condo is the cause.
Lack of an air exchanger: a compounding factor
Many recent buildings either don’t have an air exchanger, or have one that’s poorly sized, incorrectly installed, or completely inactive due to lack of maintenance. And yet, a properly sized HRV (Heat Recovery Ventilator) or ERV (Energy Recovery Ventilator) renews indoor air without energy loss, while actively filtering out pollutants.
Case study: AirGreen intervention in a new condo in Ville-Marie
Recently, a couple contacted us regarding ongoing problems in their brand-new condo in Ville-Marie: general discomfort, dry air in winter, lingering humidity in the bathroom, and cooking odors constantly trapped in the living space.
Accurate diagnosis thanks to our expertise
Our technicians conducted a comprehensive indoor air quality assessment, measuring CO₂ levels, relative humidity, and VOCs. The result: air quality was two to three times worse than recommended standards. Their condo had no active air exchange system, despite a brand-new central HVAC installation.
AirGreen solution: installation of a high-performance HRV air exchanger
We installed a VENMAR AVS® 160 CFM HRV, a system tailored for condos up to 2,000 ft², with a counterflow heat recovery system. Key features of the unit:
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160 CFM (cubic feet per minute) capacity.
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MERV 8 filters, easily replaceable.
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Compatibility with the existing duct network without demolition.
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Quiet operation, ideal for a residential space.
We integrated the unit into the existing ventilation setup using a dedicated air bypass in moisture-prone areas (bathroom, kitchen), allowing for efficient pollutant and humidity extraction.
Post-installation result
Two weeks later, the client called us back: comfort was restored, no more lingering odors, stable humidity levels, and most importantly, a noticeable feeling of “freshness” throughout the unit. Their air is now filtered, renewed, and compliant with public health standards.
Why choose AirGreen for your condo in Montréal
Complete mastery of modern residential environments
Every week, we intervene in condos located in Montréal, Laval, Longueuil, the North Shore, and the South Shore to correct similar problems. Our team is trained to:
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Conduct professional indoor air quality diagnostics.
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Propose custom solutions, even in the compact spaces typical of urban condos.
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Install high-efficiency air exchangers without compromising aesthetics.
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Provide expert advice on HVAC maintenance and daily best practices.
Available grants
Some local grants are available to subsidize the installation or replacement of high-efficiency air exchangers, especially when included in energy-efficient renovation projects. Our advisors assist you in checking your eligibility.
Practical advice: how to avoid indoor pollution in your condo
Do
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Air out regularly (10 minutes a day when possible).
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Use a range hood vented to the outside.
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Keep humidity between 40% and 50%.
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Install a certified air exchanger and perform annual maintenance.
Don’t
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Leave the bathroom unventilated.
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Keep windows closed all winter without an air exchange system.
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Use scented candles or chemical air fresheners.
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Ignore persistent odors — they’re often a sign of imbalance.
Final word
Indoor pollution and comfort cannot coexist. In a modern condo in Montréal, poor ventilation means trapping pollutants inside your home. At AirGreen, we understand the realities of local architecture, building codes, and the challenges of urban dwellings. A properly selected and professionally installed air exchanger can radically improve your daily quality of life.