A custom HVAC installation project in a Montreal duplex
At AirGreen , we regularly encounter atypical configurations that require in-depth expertise and rigorous planning. This was the case for this Gree wall-mounted heat pump installation in a duplex in the Rosemont–La Petite-Patrie neighborhood of Montreal . The main challenge: a flat roof with limited access and the need to optimize the passage of ducts while ensuring perfect stability of the outdoor unit.
Equipment choice: a Gree R-32 wall-mounted heat pump
The client wanted an energy-efficient solution adapted to Montreal winters . We recommended a Gree wall-mounted heat pump operating on R-32 refrigerant , known for its increased efficiency and compatibility with government subsidies. The chosen range is designed to offer reliable performance even in extreme cold, down to -25°C.
Key features of the installed system
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Brand : Gree
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Type : Wall-mounted heat pump (mini-split)
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Capacity : 18,000 BTU (ideal for medium to large spaces)
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Refrigerant : R-32 (more environmentally friendly than R-410A)
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Eligibility : Hydro-Québec LogisVert and Greener Homes grant programs
Technical details of the installation
The installation was carried out in the evening, requiring site lighting to ensure precise execution. Several technical aspects are worth highlighting:
Support and anchoring
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The outdoor unit was fixed on a raised aluminum support , itself stabilized by treated wooden beams.
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This method avoids any direct contact with the flat roof membrane and ensures better weight distribution.
Piping route
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The refrigerant and electrical connections were carefully insulated and capped , then guided towards the roof slope to prevent any accumulation of water.
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A linear route was chosen to reduce pressure losses and simplify future maintenance.
Condensate management
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Thanks to the roof configuration, the flow is by gravity , thus avoiding the installation of a condensate pump.
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Particular attention has been paid to the slope angle to prevent any risk of freezing in winter.
Challenges encountered and solutions provided
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Limited space : The roof angle and proximity of the skylights required a compact installation. We adjusted the height of the bracket to maintain airflow.
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Climatic conditions : Installation in the cold season required increased control of sealing and insulation to ensure optimal performance all year round.
Results and benefits for the client
The installation of this Gree R-32 heat pump in Rosemont now allows the owner to:
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Reduce your energy consumption compared to conventional electric heating.
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Enjoy stable comfort in summer and winter, with precise temperature control.
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Access grants available in Montreal, Laval, Longueuil, on the North Shore and the South Shore .
AirGreen expertise in Montreal HVAC installations
Every wall-mounted heat pump installation project in Montreal is unique. This duplex demonstrates our ability to adapt our methods to a variety of contexts: flat roofs, limited space, aesthetic or climatic constraints. At AirGreen, we always ensure a safe, durable installation that meets the strictest standards.