The purity of the air we breathe indoors has become a major public health issue, especially in densely populated cities like Montreal, Laval, and Longueuil, where climate variations and outdoor pollution directly impact indoor air quality. At AirGreen, we are often asked to recommend HVAC solutions that not only provide thermal comfort but also actively improve air quality in homes and commercial spaces. In this article, we’ll explore the performance of different indoor HVAC units – cassette, ducted, console, floor-ceiling – in terms of air purification, based on concrete data from our real-world installations in Montreal and across the North Shore and South Shore.
Why is indoor air quality a priority in Montreal and surrounding areas?
In a region where people spend nearly 90% of their time indoors, it’s crucial to understand the factors that influence indoor air quality. Fine dust particles, mold spores, combustion particles, VOCs (volatile organic compounds), allergens, and other invisible pollutants build up quickly, especially in well-insulated homes. Poor ventilation or a poorly maintained HVAC system can make things worse, causing discomfort or even long-term health issues.
Our criteria for evaluating the most effective indoor units
When we assess the performance of indoor HVAC units, we rely on several practical, measurable indicators:
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Filtration quality (type of filter, HEPA, ionizer, plasma, etc.)
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Dehumidification and ventilation capacity
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Air renewal rate (in m³/h)
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Integrated purification technologies
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Ease of maintenance
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Customer feedback after installation
We combine these factors with data collected from real-world installations across Montreal, Boisbriand, Brossard, and Repentigny, among others.
Cassette indoor units: an efficient solution for large spaces
Cassette units, typically installed in drop ceilings, are ideal for open areas like offices or open-concept living rooms. Thanks to their multi-directional airflow, they provide even coverage of treated air. Several models installed by AirGreen include electrostatic filters and Plasma Quad Plus or Ionizer modules.
Case Study – Cassette Installation in Rosemère (North Shore)
We recently installed a Fujitsu R32 - 36,000 BTU cassette unit in a professional workspace. Thanks to its built-in (bipolar ionizer) air purification system, ambient air quality improved from 75 µg/m³ of fine particles to under 10 µg/m³, according to our sensors. The client reported a significant drop in allergy symptoms among staff.
Ducted units: discreet and effective year-round
The ducted system is one of the most efficient for air renewal. With its network of ducts, it can ventilate multiple zones simultaneously and evenly. Some models even include centralized purification modules with HEPA filters, UV-C lights, or cold plasma systems.
Installation Example – Laval-des-Rapides
For a family suffering from chronic allergies, we installed a Bosch BIVA IDS Premium R-454B ducted system connected to an air exchanger with HEPA filtration. After a few weeks, excessive humidity was under control, and air quality remained stable even during pollen season. This system also qualified for a LogisVert grant.
Console units: compact and localized air treatment
Often installed at the bottom of a wall, console units are popular in homes with space constraints. They offer good basic filtration, but their range is more limited than other units. However, some Fujitsu models include antibacterial ceramic filters and air quality sensors.
Example in Longueuil – Semi-Basement Apartment
In a Longueuil condo where air quality was affected by humidity, we installed a Sharp ZU1 12,000 BTU wall console with a built-in dehumidifier. Result: a 60% drop in humidity levels in under 48 hours and a noticeable improvement in ambient odors.
Floor-ceiling units: versatility and enhanced air sanitation
Mounted near the floor or ceiling, these units are ideal for complex room layouts (large windows, high ceilings). They often come with long-life filters, a photocatalytic purification system, and can also serve as ventilation complements.
Client Testimonial – Seniors’ Residence in Boucherville
We outfitted a seniors’ residence with several Gree Multi R32 floor-ceiling units, adding UV-C modules. Post-installation analyses showed an 80% reduction in airborne bacteria, according to our microbiology partner.
Overall comparison of indoor units based on air purification performance
| Type of Indoor Unit | Purification Level | Integrated Technology | Best Suited For | AirGreen Recommendation |
|---|---|---|---|---|
| Cassette | High | Ionizer, plasma | Open spaces | ★★★★☆ |
| Ducted | Very High | HEPA, UV-C, plasma | Large homes, offices | ★★★★★ |
| Console | Moderate to Good | Antibacterial filter | Compact apartments | ★★★☆☆ |
| Floor-Ceiling | High | UV-C, photocatalysis | Complex room layouts | ★★★★☆ |
Conclusion: which unit is best for purifying your indoor air in Montreal?
The choice of indoor unit mainly depends on your space configuration, purification needs, and budget. At AirGreen, we always perform an on-site air quality analysis, followed by a custom recommendation. Thanks to our extensive experience with various HVAC installations across Montreal, Laval, Longueuil, the North Shore, and the South Shore, we’re equipped to offer solutions that are both highly effective and built to last.
Our practical tips for maintaining clean air
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Have your HVAC system inspected at least once a year.
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Replace filters according to the manufacturer’s recommendations.
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Choose systems with advanced purification technologies.
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Avoid indoor pollution sources (chemical products, scented candles, etc.).
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Invest in a humidifier or dehumidifier depending on the season.
AirGreen: your HVAC partner for cleaner, healthier air
We believe an HVAC system should be more than just a heating or cooling appliance: it should be a tool for health, comfort, and well-being. Our certified technicians operate throughout Greater Montreal to offer high-performance, accessible solutions that are tailored to your specific air quality needs.
Contact us today for a personalized evaluation of your indoor air quality and to discover which indoor unit is best suited to your needs.