A custom configuration for a Montreal residential building
At AirGreen , we understand that every HVAC installation project in Montreal requires a unique approach. On this day, our team visited a residential building in the Rosemont–La Petite-Patrie neighborhood for a complete installation of a Midea MultiZone system . The goal: to provide each indoor unit with independent comfort control while optimizing overall energy performance.
Initial project analysis
The building in question already had a few individual wall-mounted units installed over the years. However, their haphazard arrangement, combined with compressors installed directly on the roof deck, created thermal inefficiencies and maintenance risks.
The owner wanted to consolidate his appliances into a centralized MultiZone system —an ideal solution for multi-unit buildings or urban duplexes. After studying the heat loads, we opted for a Midea MultiZone 36,000 BTU system , capable of powering three independent wall-mounted units, each tailored to the size of his home.
Technical preparation and planning
Before installation, our technicians:
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Evaluated the load-bearing capacity of the flat roof , essential for the stability of the outdoor units.
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Planned the arrangement of the condensers to ensure free air circulation and avoid recirculation of hot air.
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Integrated anti-vibration supports made of treated wood and rubber , preventing any transmission of vibration to the structure.
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Prepared refrigeration lines and communication cables protected by UV-resistant insulating sheaths.
Each unit has been thermally insulated and connected to its respective circuit, ensuring independent and silent operation.
Installation of outdoor units: efficiency and safety
The photo shows three Midea outdoor units installed perfectly aligned on the roof. Each is mounted on raised supports to allow for efficient drainage and avoid direct contact with the roof surface.
The key points of this step:
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Flare refrigeration fittings tightened and nitrogen tested to ensure leak-tightness.
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240V power supply connected via waterproof boxes installed on the fire walls.
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Condensate drainage redirected to downspouts, avoiding any water stagnation.
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Pressure test to 500 psi and vacuum before full R-410A charge.
This configuration allows each indoor unit to operate independently while sharing a single, optimized outdoor base.
Commissioning and adjustment of zones
Once the installation was complete, we proceeded with the full commissioning of the MultiZone system.
Our technicians have:
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Calibrate the blowing temperature for each zone.
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Checked communication between wall heads and main compressor .
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Measured the temperature difference between the air inlet and outlet (between 15 and 17°C, depending on the area).
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Validated the air flow and noise level.
Each unit has been configured according to the occupants' preferences:
a cooler bedroom at night, a living room with an eco mode during the day, and an office with a constant temperature for working comfort.
Result: consistent comfort and controlled consumption
Thanks to this installation, the owner now benefits from:
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A stable and silent system even in high heat.
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Centralized energy management , reducing overall consumption.
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A harmonious appearance on the roof, facilitating maintenance and extending the life of the equipment.
The Midea MultiZone system has proven to be a wise choice: reliable, efficient and perfectly adapted to the Montreal climate.
AirGreen expertise: precision and rigor at every stage
This project in Rosemont–La Petite-Patrie illustrates AirGreen 's ability to design and install custom HVAC solutions in complex urban environments.
Our technicians have been able to combine engineering, safety and aesthetics , guaranteeing the customer optimal performance for several years.
Whether for a MultiZone installation, preventive maintenance or a repair , we operate throughout Greater Montreal, Laval, the North Shore and the South Shore with the same requirement for quality and reliability.