Installation of a Sharp ZU1 series wall-mounted heat pump on a flat roof in Rosemont–La Petite-Patrie

A triple installation in the heart of Montreal's winter

At AirGreen , we recently completed an installation of three Sharp ZU1 series outdoor units on the flat roof of a residential building in the Rosemont–La Petite-Patrie neighborhood. This project perfectly illustrates our expertise in implementing high-performance HVAC systems in Montreal's dense urban environments.

Despite still very present winter conditions – partial snow, meltwater and fluctuating temperatures – our team carried out a safe, stable and energy-optimized installation .

Equipment selection: the Sharp ZU1 series, a standard for winter comfort

The Sharp ZU1 is a high-performance wall-mounted heat pump , designed to withstand the harsh Quebec climate. Capable of providing efficient heating down to -25°C , it combines inverter technology and R-32 refrigerant, ensuring superior energy efficiency and quiet operation.

For this multi-unit building, three independent systems were chosen:

• Capacities from 12,000 to 18,000 BTU depending on the indoor units;

• Four-season heating and cooling mode ;

• Compatibility with provincial subsidies (high-performance heat pump programs).

A flat roof, a challenge mastered

Installing heat pumps on a flat roof requires meticulous planning:

• Raised galvanized steel supports to avoid direct contact with the roofing membrane;

• Treated wooden sleepers placed on anti-vibration feet to distribute the load and protect the waterproofing;

• Precise routing of refrigerant lines and electrical wiring , carefully sheathed to resist frost and UV rays;

• Condensate management by gravity flow, avoiding any accumulation of water under the units.

This type of installation offers several advantages: easier access for maintenance , better air circulation around the units and increased sound insulation for the building's occupants.

Precision work by AirGreen

Our RBQ and CCQ certified technicians coordinated all the steps:

• Structural assessment of the roof;

• Installation of the power supply on a dedicated circuit breaker;

• Checking the flow slopes for condensates;

• Full performance testing before commissioning.

Every Sharp unit has been tested to ensure optimal operation in heating mode, even at low temperatures. The result: a reliable, balanced and durable system, ready to provide consistent comfort all year round.

A sustainable and energy-efficient investment

By choosing the Sharp ZU1 , owners benefit from excellent value for money , while reducing their carbon footprint. Thanks to frequency inversion technology , energy consumption is adjusted according to actual demand, which results in:

• Up to 40% energy savings compared to traditional electric heating;

• Extended equipment life ;

• A significant reduction in outside noise .

Why choose AirGreen for your flat roof projects?

Montreal roofs present unique challenges—snow, freeze-thaw cycles, and access constraints—but also great opportunities. At AirGreen, we master installation protocols that comply with City of Montreal standards and manufacturer requirements.

Our interventions guarantee:

• Full compliance with RBQ and CSA standards ;

• Complete protection of the roof membrane ;

• An aesthetic and watertight routing of the conduits ;

• Post-installation monitoring including seasonal maintenance.

Technical summary of the installation

Your project, our expertise

Whether you own a duplex, a rental property, or a commercial building, AirGreen offers complete HVAC solutions tailored to your space and budget.
Our teams operate in Montreal, Laval, Longueuil, on the South Shore and the North Shore , with the same rigor and the same commitment to quality.