An HVAC installation perfectly suited to Montreal’s flat roofs
At AirGreen , we are regularly called upon to install multi-zone wall-mounted heat pumps on the flat roofs of residential buildings in Southwest Montreal . This type of urban environment requires a rigorous technical approach: solid supporting structure, precise management of duct lengths and adaptation to the Montreal climate.
The installation presented here perfectly illustrates this know-how: a Sharp BU heat pump , a multi-zone system designed to provide uniform comfort to several interior spaces while maximizing energy efficiency.
Why the Sharp BU is a smart choice
The Sharp BU is part of the new generation of R-32 wall-mounted heat pumps . It combines energy efficiency, compact design and quiet operation—ideal qualities for urban homes.
This particular installation supplies two separate interior zones , allowing each occupant to adjust the temperature according to their preferences. The BU series is distinguished in particular by:
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A high seasonal energy efficiency (SEER) , synonymous with significant electricity savings;
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Reliable performance down to −25°C , essential for tackling Montreal winters;
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Inverter technology ensuring intelligent adjustment of power according to demand;
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Compatibility with provincial grant programs for high-efficiency systems.
The challenges of installing on a flat roof
Installing an HVAC system on a flat roof, as is often the case in the Southwest , requires meticulous planning. Our RBQ-certified technicians had to consider:
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Structural stability of the roof : use of galvanized supports on treated logs , with insulating soles to protect the waterproofing membrane;
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Drainage and flow of condensates , ensured by a slight inclination and sufficient clearance under the units;
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The length of the refrigerant path , carefully calculated to optimize thermal performance;
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Wind resistance , crucial at height, with anchoring that meets the building's load standards;
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Access security , to facilitate periodic maintenance without compromising the integrity of the roof.
This configuration not only guarantees the durability of the system , but also aesthetic and functional integration into a dense urban environment.
Exemplary wiring and piping
The two Sharp BU condensers were connected by a clean and orderly route of cables and refrigeration pipes. We prioritized:
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A discreet, UV-resistant black cover ;
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A waterproof aluminum junction box ;
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Insulated fittings ensuring thermal and mechanical sealing;
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A direct electrical connection to the main panel via a dedicated CSA-compliant circuit breaker;
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Double-layer insulation on liquid and vapor lines to maximize efficiency.
Every detail has been designed to reduce pressure losses, prevent water infiltration and ensure electrical safety at all times.
Multi-zone comfort at the heart of the home
Inside, the multi-zone system allows for independent temperature control in multiple rooms. Whether in a south-facing living room or a northeast-facing corner bedroom, the Sharp BU automatically adjusts its temperature to maintain consistent comfort.
The discreet and quiet wall-mounted indoor units offer:
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Uniform air distribution , without unpleasant drafts;
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An effective dehumidification mode during humid days;
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Multi-level air filtration , improving indoor air quality;
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A smart remote control with weekly programming.
Energy efficiency and available grants
Thanks to its variable speed inverter compressor and environmentally friendly R-32 refrigerant, the Sharp BU offers efficiency greater than 20 SEER.
This high efficiency makes the installation eligible for various subsidies from the Rénoclimat program and Transition Énergétique Québec , which encourage the adoption of high-efficiency systems.
Our advisors support each client in:
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Preparation of application forms ;
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Verification of the model's eligibility ;
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The assembly of the energy proof file ;
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Project optimization to maximize financial returns.
An installation designed to last
Montreal's environment imposes unique constraints: intense frost, rapid temperature fluctuations, high humidity. At AirGreen, we adapt each installation to withstand these extreme conditions:
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Stainless steel screws and galvanized frames ;
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Cold-resistant cables ;
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Complete sealing of wall and roof penetrations ;
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Commissioning tests (pressure, leak, evacuation, internal/external communication) carried out the same day.
This rigor guarantees maximum longevity and peace of mind for our customers.
Personalized interview and follow-up
A high-performance heat pump deserves regular maintenance. We offer an AirGreen preventive maintenance program that includes:
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Complete cleaning of filters and coils;
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Checking the refrigerant level;
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Inspection of wiring and electrical connections;
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Testing evaporation and condensation temperatures;
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Annual performance report with personalized recommendations.
This maintenance not only ensures the energy performance of the system, but also extends its lifespan.
Result: efficiency, comfort and discretion
The installation of this Sharp BU MultiZone in Le Sud-Ouest perfectly illustrates the balance between technical performance , energy efficiency and urban integration .
Thanks to careful design and execution in accordance with the strictest standards, we have delivered to our customers a reliable, quiet system that is perfectly adapted to Montreal's reality.
Your HVAC project deserves the same precision
Are you considering installing a Sharp wall-mounted heat pump , a multi-zone system or a central heat pump in Montreal, Laval, Longueuil, on the North Shore or the South Shore?
At AirGreen, we support each customer from the choice of model to the first start-up , with a single objective: to offer lasting comfort and exemplary efficiency, summer and winter.