Two flat-roof units for customized comfort, installed with a professional finish and designed for the climate of Greater Montreal
Project background
At AirGreen , we are modernizing the comfort of a lightweight building in Saint-Laurent (Montreal) by adding two Gree Vireo R32 wall-mounted heat pumps dedicated to separate zones. The goal: precise air conditioning in the summer, efficient heating until the bitter cold in the winter, while controlling electricity consumption.
Why the Gree Vireo R32 for this type of building
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R-32 refrigerant : better energy efficiency and reduced charge compared to R-410A.
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Low temperature operating range (Vireo R32 series) for the Montreal climate .
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9k to 24k BTU formats to adapt to each area (office, meeting room, light workshop).
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Low noise levels indoors and outdoors – essential in a tertiary environment.
Installation details – gravelled flat roof
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Location : two outdoor condensers aligned on a flat roof covered with gravel, away from traffic areas.
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Supports : galvanized steel frame on treated wooden soles , distributing the load and avoiding any pressure points on the membrane.
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Connections : insulated copper refrigerant connections, sheathed and secured; short route to the mechanical crossing to limit pressure losses.
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Power : Outdoor disconnect boxes and CSA approved cables, dedicated circuits to the electrical panel.
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Condensate management : gravity drainage on the interior side; slope ensured and insulation of sections in the cold zone to prevent frost.
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Protection : grid guards on exchangers, torque-measured tightening of flare fittings, nitrogen test and deep vacuum before loading, then control with electronic detector.
Sizing and expected performance
We size each wall-mounted heat pump based on sensible/latent loads (occupancy, solar gain, ventilation). On typical office spaces, the 12,000 and 18,000 BTU steps cover the majority of needs. As supplemental heating, the Vireo R32 maintains an advantageous COP in the negative temperatures frequently found in Montreal , Laval and the North/South Shore .
Acoustics and vibrations
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Silent blocks integrated into the supports.
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Compliant clearances to prevent any re-aspiration of air and limit wind turbulence.
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Sealed wall passage with vapor barrier sleeve and membrane-compatible mastic.
Security and Compliance
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RBQ , Quebec Electrical Code and manufacturer's recommendations respected.
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Defrosts checked in heating mode; clear slope for drainage.
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Clear labeling of circuits and grounding of each unit.
Result for the customer
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Zoned comfort : each space regulates its temperature independently.
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Energy efficiency : inverter motors and R-32 reduce annual bills.
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Simplified HVAC maintenance : easy access to both units and connections, washable interior filters, AirGreen preventive maintenance plan.
Recommended maintenance (AirGreen annual plan)
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Cleaning of batteries and fans (int./ext.), pressure control, leak test and parameter update.
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Checking the roof fixings , the condition of the soles and the mechanical tightening after the freeze-thaw cycle.
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Calibration of remote controls and usage reminder to optimize heat pump mode in mid-season.
Grants and Eligibility
Depending on the configuration (certified performance, operating ranges in extreme cold and Energy Star ), the installation may be eligible for local assistance . We check eligibility for you in Montreal , Laval , Longueuil , North Shore and South Shore , and prepare the necessary documents.
What more we bring
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Thermal analysis before choosing a device.
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Careful HVAC installation in an occupied environment, coordinated deadlines to minimize business interruption.
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AirGreen labor warranty and long-term support (parts depending on manufacturer).
Your wall-mounted heat pump project in Greater Montreal
Whether you manage a duplex, a condo or a commercial building, our teams carry out installations on flat roofs , facades or on the ground, with the same high standards. Need a quick quote for a Gree Vireo R32 or a Sharp , Fujitsu or Midea alternative? We advise you on the best solution for Montreal , Laval , Longueuil , the North Shore and the South Shore .
Key points of this achievement
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Two Gree Vireo R32 wall-mounted heat pumps , independent zones.
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Installation on galvanized supports with soles, clean crossings and dedicated cabling .
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Optimization of performance in winter supplementary heating and precise air conditioning in summer.
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Easy maintenance access and durability of the roof fixing.
Next step
Contact AirGreen for an on-site technical assessment : loads, BTU selection, connection routes, installation schedule, and maintenance options. We deliver a clean, documented site ready for the following season.
Useful keywords: heat pump , wall-mounted heat pump , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Gree Vireo R32 .