An exemplary outdoor installation for four-season comfort in Montreal
At AirGreen , we have just completed an HVAC installation that perfectly illustrates our technical and aesthetic requirements: a Sharp ZHU1 (R-32) wall-mounted heat pump serving a plex apartment in Rosemont–La Petite-Patrie . The discreet indoor unit ensures regular air diffusion; the outdoor unit, a Sharp Eco Inverter with Plasmacluster technology , is raised on an aluminum base to guarantee stable performance in the middle of Montreal's winter.
The owner's goal was twofold: to reduce energy costs without sacrificing comfort, and to preserve the aesthetics of the façade and interior. We therefore designed a clean and short connection route, robust anti-vibration supports, and fine-tuned the supply damper to optimize thermal stratification.
Why the Sharp ZHU1 is a must-have in an urban plex
The Sharp ZHU1 is a new generation wall-mounted heat pump with R-32 refrigerant , known for its low-temperature heating stability and the air quality provided by Plasmacluster Ion , a brand signature. For a medium-sized Montreal home, its inverter modulation allows the power to be adjusted to the actual needs room by room, which avoids energy-consuming on/off cycles and improves sound comfort.
Major advantages for urban housing:
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Compactness of the interior head and quiet operation, suitable for open living rooms.
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Responsive inverter compression : rapid temperature rise in the morning and gentle maintenance in the evening.
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Improved air quality thanks to ionic treatment, useful in apartments along busy arteries.
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R-32 refrigerant : reduced charge, better heat transfer and reduced environmental footprint compared to older generations.
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Extreme cold design : heating operation down to negative temperatures common in Montreal (down to approx. −25°C depending on capacity ), an essential point for getting through the winter without energy-consuming additional heating.
Installation details: clean, durable and designed for winter
Raised outdoor installation
The Sharp Eco Inverter unit is mounted on a raised aluminum stand with anti-vibration pads . This solution offers several decisive advantages for Montreal, Laval, Longueuil, North Shore and South Shore :
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Snow clearance : the height of the base limits burial during snowbanks and facilitates the flow of defrosting water.
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Open air : rear and lateral clearance is respected to maintain an optimal exchange rate even during prevailing winds.
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Simplified maintenance : clear access to the casing and screws shortens maintenance operations.
The refrigeration path exits directly from the wall behind the machine: insulated and sealed connections with weatherstripping and clear capping for a clean finish. The slope of the drain is checked to evacuate summer condensates by gravity; in winter, the location prevents the formation of icicles in front of the passages.
Careful interior integration
Inside, the wall head is positioned above the window frame , at a height allowing efficient horizontal airflow . We validate the absence of obstacles (rods, wall returns, curtains) to maintain a free airflow . The communication cabling follows the same technical cover as the connections, which avoids multiple drilling and preserves the aesthetics .
Commissioning steps
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Tracing and drilling with controlled diameter with watertight bulkhead .
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Bending and crimping of copper lines according to the manufacturer's tightening torques.
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Deep vacuum and leak test (vacuum stability).
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Opening valves and controlling superheat/subcooling parameters .
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Calibration of blowing speeds and programming (Auto mode, defrost, automatic restart).
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Provision of a maintenance guide and explanation to the customer of good seasonal practices.
What does raised flooring change compared to flooring?
Montreal and the greater Montreal area experience frost, thaws, and freezing rain . Installing the tray directly on the ground can cause icicles to form in the tray and limit air intake when snow accumulates. The aluminum base we prefer:
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maintains constant airflow during defrosts;
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keeps meltwater splashes away from the facing;
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reduces nuisance by transferring fewer vibrations to the balcony or slab.
Result: constant comfort and low bill
From the moment it was switched on, the Sharp ZHU1's inverter modulation allowed it to reach the set temperature without overheating, then maintain a stable temperature with little variation. In summer, the horizontal sweep and dehumidification provide a uniform feeling of freshness, including in the adjacent corridors.
Our clients in Montreal, Laval, Longueuil, North Shore and South Shore generally note:
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a significant reduction in kWh thanks to modulation and R-32;
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improved acoustic comfort (low noise perceived in standby and at low speed);
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healthier air quality , useful for homes overlooking busy streets.
Good practices for use and maintenance
To protect your investment and maintain peak performance, we recommend:
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Internal filters : light rinse every 4 to 6 weeks during periods of heavy use.
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Exterior Clearance : Maintain 45 to 60 cm of clear space around the unit; clear fresh snow after heavy snowfall.
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Heating mode : avoid changing the setpoint too frequently; let the inverter algorithm modulate .
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Annual AirGreen maintenance : load check, exchanger/fan cleaning, parameter check and tightening.
Key technical details of the AirGreen installation
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Equipment type : single-zone wall-mounted heat pump .
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Brand : Sharp – Eco Inverter with Plasmacluster .
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Range : ZHU1 (R-32).
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Support : raised aluminum base with anti-vibration pads .
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Route : direct wall outlet, clear capping , high density insulated connections.
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Condensate management : gravity slope for summer; free drainage for defrost water in winter.
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Context : urban plex, balcony/tiled slab, snowy environment.
Eligibility for aid and support
Depending on the configuration and current criteria, a high-efficiency R-32 wall-mounted heat pump may be eligible for assistance programs in Quebec. Our team provides advice and support for Montreal, Laval, Longueuil, the North Shore, and the South Shore : evaluation, proof of installation, equipment surveys, and coordination with relevant organizations.
Why entrust your project to AirGreen?
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Local expertise in HVAC installation on plexes, condos and single-family homes.
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Neat finishes : short runs, clean hood, raised supports adapted to the climate.
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Fast interventions and accessible after-sales service .
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Clear maintenance plan to maintain machine performance and lifespan.
This achievement in Rosemont–La Petite-Patrie demonstrates our approach: rigorous technique, mastered aesthetics and lasting comfort for residential properties in Greater Montreal.
Last updated: October 16, 2025
AirGreen – Heat Pumps, Air Conditioning & Heating. Service in Montreal, Laval, Longueuil, North Shore and South Shore.