In Montreal's Southwest borough, flat roofs are everywhere: duplexes, small apartment buildings, newer condos… and more and more homeowners want to enjoy year-round comfort without sacrificing interior space. That's precisely the goal of this project: installing a Sharp multi-zone heat pump with its condenser on the roof to supply several wall-mounted units inside the apartment.
Project context: multi-room comfort, without compromise
Our client wanted:
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Heating and cooling several rooms in your home (living room and master bedroom) with a single outdoor system.
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Preserve the aesthetics of the facade and the rear courtyard, which is already very limited.
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Benefit from an energy-efficient system that performs well in both air conditioning and heating, even during Montreal winters.
We therefore recommended the installation of a Sharp multi-zone heat pump , model from the Sharp Multi-Zone BU R-32 range, perfect for serving two indoor zones with a single outdoor compressor.
Type of system installed: Sharp multi-zone heat pump
The system installed is a multi-zone heat pump (mini-split multi-zone) from the Sharp brand, known for its efficient and reliable wall-mounted and multi-zone units.
Main features of the system:
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Brand: Sharp
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Type: Wall-mounted multi-zone heat pump (mini-split)
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Model: Sharp Multi-Zone BU R-32, 2 zones
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Refrigerant: R-32 (A2L classification, low environmental impact)
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Application: Heating and cooling of two indoor zones
This type of configuration allows two independent wall units to be connected to a single outdoor condenser, ideal for Montreal homes where every square meter must be optimized.
A flat rooftop installation, designed for Montreal
The photo clearly shows the Sharp condenser installed on the building's flat roof . This choice is not merely aesthetic: it addresses several constraints typical of buildings in the Southwest.
1. Elevated support and respect for the roof
The condenser is placed on:
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A metal support fixed on wooden pads resting on the roof membrane.
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Sufficient height to clear it of snow, standing water and rubble.
This type of assembly allows:
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To protect the roof's waterproofing membrane.
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To facilitate drainage and maintenance.
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To reduce the transmission of vibrations to the building.
2. Clearances and air circulation
The condenser is installed:
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At a safe distance from parapets and other obstacles.
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With sufficient rear and side clearance to ensure optimal airflow .
This is essential to maintain the performance of the heat pump in air conditioning in the summer, but also in heating in the winter, when frost and snow can hinder operation.
3. Management of refrigeration lines and cabling
Several isolated refrigeration lines can be seen exiting from the side of the unit:
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The copper tubes are completely covered with high-quality, UV-resistant black insulation .
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The bundle is grouped and tied neatly , which reduces the risk of friction, mechanical damage and heat loss.
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The electrical wiring runs down the support, also securely attached, to ensure safety and durability.
This finish is not just about aesthetics: continuous and well-installed insulation reduces energy loss and protects the system against freezing, overheating and water infiltration.
Choosing R-32: performance and environment
The label visible on the side of the condenser clearly indicates the presence of an A2L refrigerant: this is R-32 , the new standard for modern heat pumps.
Its advantages:
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Global warming potential (GWP) significantly reduced compared to R-410A.
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Improved seasonal performance in air conditioning and heating.
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This allows Sharp to achieve very good energy efficiency , resulting in lower electricity bills for the customer.
By respecting the installation standards specific to A2L refrigerants (positioning, ventilation, safety connections), we offer a system that is efficient, durable and compliant with the latest regulations.
Four-season comfort in the Southwest
Inside, each Sharp wall unit serves a specific area:
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The living room , with a unit ideally placed to circulate the air in the main room.
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The room , for perfectly controlled comfort, summer and winter.
Thanks to heat pump technology:
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In summer , the system offers quiet air conditioning, ideal for the hot and humid nights typical of downtown Montreal.
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In winter , the heat pump recovers calories from the outside air to heat the home, even when it is very cold, thus reducing reliance on electric baseboard heaters.
Each zone has its own independent remote control , allowing the customer to adjust the temperature room by room according to their lifestyle.
A project carried out according to best practices
As with all our installations at AirGreen:
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We validated the structure and access to the roof before proposing the installation of the condenser on the roof.
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The wall and roof penetrations were executed carefully, with appropriate sealants to ensure watertightness.
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The system was vacuum-sealed, nitrogen-tested , then charged and commissioned according to Sharp's specifications.
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The customer received all the instructions for use , basic maintenance guidelines and warranty details.
The result: a clean, discreet, silent installation ready to face the winters of the Southwest and the heat waves of Montreal.
Why choose AirGreen for your Sharp heat pump in Montreal?
By choosing AirGreen for your Sharp heat pump , you benefit from:
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Specialized expertise in wall-mounted and multi-zone heat pumps in Greater Montreal.
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Neat installations, compliant with current standards for modern refrigerants such as R-32.
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Advice tailored to the realities of Montreal buildings : flat roofs, multiplexes, condos, row houses, etc.
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With a human, responsive and transparent after-sales service.
Whether you are in the Southwest, Verdun, Rosemont, Laval, the South Shore or the North Shore , our team will travel to offer you sustainable, efficient and well-thought-out heating and air conditioning solutions.
Are you considering installing a Sharp multi-zone heat pump on a flat roof or in a backyard in Greater Montreal?
Contact us: we would be happy to analyze your building, your needs room by room and offer you a turnkey solution, like this successful installation in Southwest Montreal.