A high-performance and discreet HVAC solution in the heart of downtown
At AirGreen , we recently installed a Sharp ZU1 wall-mounted heat pump in a residential building in Montreal's Ville-Marie district . This project perfectly illustrates our expertise in a dense urban environment, where every technical detail counts to ensure performance, durability, and comfort—without compromising the building's aesthetics.
An installation adapted to the urban environment
The context of this installation was typically Montreal: a condo located on the top floor of a flat-roofed building , exposed to the demanding climatic conditions of the city center.
To protect the waterproofing membrane, we fixed the Sharp ECO Inverter condenser to a raised aluminum structure , resting on treated wooden sleepers and insulated supports .
This configuration ensures excellent mechanical stability while avoiding any direct stress on the roof.
Our technicians have carefully planned the passage of refrigerant pipes and electrical cables in white insulated sheaths , guaranteeing both UV protection and energy efficiency of the system.
Sharp ZU1 technology: comfort and efficiency even in winter
The Sharp ZU1 is part of the recent generation of wall-mounted heat pumps with Inverter and Plasmacluster Ion technology .
This combination provides active air purification , precise temperature control and stable performance down to −25°C , perfectly suited to Montreal winters.
Thanks to its modulating compressor, the system automatically adjusts its power according to actual needs, thus reducing electricity consumption while maintaining constant comfort.
Sharp ECO Inverter Series units are renowned for their quiet operation , a major advantage in urban environments. The rooftop-mounted outdoor unit ensures unobstructed airflow and easy maintenance , while limiting noise pollution for occupants.
Technical challenges and solutions
Installing a heat pump on a flat roof involves several challenges:
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Weight and stability management on the waterproofing membrane;
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Direct exposure to the elements ;
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Duct routing optimized to reduce pressure losses and ensure efficient drainage.
Our experts have resolved these constraints by opting for:
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Anti-corrosion galvanized metal supports fixed on insulated wooden sleepers;
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Precise positioning to facilitate maintenance without hindering traffic;
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Gravity drainage of condensate , avoiding the use of a pump and reducing the risk of freezing.
Each step has been validated according to RBQ standards and CCQ best practices , ensuring a compliant and durable installation.
Result: efficiency, silence and peace of mind
Since commissioning, the customer has benefited from exceptional thermal comfort and a significant reduction in the electricity bill , in particular thanks to the high energy efficiency (Energy Star) of the Sharp ZU1.
The system operates quietly , even in defrost mode, which is particularly appreciated in a dense residential environment.
Subsidies and economic benefits
Sharp ZU1 heat pumps are eligible for several grant programs in Quebec, notably through Hydro-Québec and Transition Énergétique Québec , thanks to their high coefficient of performance and their use of ecological R-32 refrigerant .
These grants significantly reduce the initial cost of installation while promoting a sustainable heating and air conditioning solution.
An installation by AirGreen: expertise and precision
Every AirGreen project in Montreal is carried out with meticulous attention to detail, a thorough understanding of local standards and a constant focus on customer satisfaction.
Our team ensures adequate sizing , the choice of the right Sharp model , and careful integration respecting both the architectural and energy constraints of the building.
At AirGreen, we don't just install heat pumps: we design HVAC solutions that are durable, reliable and adapted to the climate of Greater Montreal .
AirGreen — Installation, maintenance and repair of Sharp heat pumps in Montreal, Laval, Longueuil, North Shore and South Shore.
Warning: Any heat pump installation on a flat roof must be carried out by RBQ certified professionals to guarantee the safety, compliance and longevity of the equipment.
Last updated: October 16, 2025