Two compact outdoor units, a peaceful courtyard and stable year-round comfort
Building context and project objectives
At AirGreen , we modernize brick plexes in Montreal with recent wall-mounted heat pumps , capable of providing air conditioning in the summer and reliable heating support in the cold season. In this typical Rosemont–La Petite-Patrie plex, the owners wanted:
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a quiet HVAC solution for two separate dwellings;
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a discreet exterior installation, without obstructing the service driveway;
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R-32 performance to reduce environmental footprint and electricity consumption.
We selected Sharp (R-32) in a configuration of two independent single zones , each dedicated to a living area (open living room/kitchen). The inverter technology and Plasmacluster air treatment provide appreciable air quality in an urban environment.
Why Sharp (R-32) is the best choice here
Performance and modulation
The Sharp ZU1/TU R-32 series are distinguished by fine modulation of the inverter compressor, limiting on/off cycles and maintaining a stable temperature. The result: consistent comfort , controlled noise levels and savings on the bill.
Quebec cold and reliability
The range's extreme cold models maintain good heating capacity at sub-zero temperatures, a valuable asset during peak demand in Montreal . Combined with a building envelope typical of plexes, these units provide efficient backup , while preserving the electricity bill thanks to high seasonal coefficients.
R-32 refrigerant
R-32 reduces GWP compared to R-410A and makes it easier to achieve efficiency thresholds often required by grants when the selected version is cold climate and approved.
What we achieved on site
Exterior installation: precision and clearances
The two Sharp condensers are placed on galvanized wall brackets , slightly above the river stone bed. This configuration:
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places appliances away from splashes and facilitates defrost drainage;
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frees up the yard tread and preserves accessibility for maintenance;
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minimizes vibrations thanks to silent blocks under the plates.
We respect the clearances on the wall, facade and between devices to guarantee good air intake and avoid any thermal recycling between the two units.
Refrigerated connections: short and protected route
Each insulated copper circuit follows a straight path to the interior heads:
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clean wall outlet, vapor barrier sleeve and careful exterior sealing;
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low-profile gray conduit cover for a simple visual integration along the foundation;
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typical lengths 5 to 7 m per unit, limiting losses and optimizing superheating/subcooling .
Condensate management
Cooling condensate is directed by gravity to the stone bed, with a continuous slope and a non-return valve if necessary. In heating, the free space under the appliances prevents the formation of annoying ice cubes.
Electricity and compliance
Our licensed electricians install visible exterior disconnects near the service uprights, wire the dedicated power supplies to the panel and test:
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deep vacuum (< 500 microns);
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sealing of flared fittings;
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checking the fan intensities and direction of rotation .
Each unit is registered with serial numbers , completed photos and commissioning sheet , facilitating manufacturer warranty and future maintenance.
Inside: comfort, silence and air quality
Wall heads and air diffusion
Sharp indoor units are built high into load-bearing walls, with automatic sweeping and fine-tuning of airflow. The inverter algorithm maintains a stable temperature without significant fluctuations.
Plasmacluster: a real plus in urban areas
Ion Plasmacluster technology helps reduce airborne particles and household odors. In homes facing a busy road, this benefit quickly impacts perceived air quality .
Sizing: the AirGreen method
Accurate thermal balance
Before any selection, we carry out a thermal assessment :
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glass surfaces and room orientations;
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insulation of brick walls, floors and roofs;
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internal charges (occupation, cooking, equipment).
Objective: choose a capacity that modulates low most of the time and avoids oversizing (source of noise, short cycles and discomfort).
Two single zones instead of one multi-zone?
In this plex, the independent use of the accommodation requires two single zones instead of one multi-zone . Advantages:
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complete autonomy of adjustment for each occupant;
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simplified maintenance (one circuit = one head);
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redundancy : if one unit is in service, the other unit remains fully operational.
Results: measurable comfort and clean construction site
acoustics and neighborhood
The bracket mounting and silent blocks limit transmissions into the masonry. Sharp units maintain a low noise level , even in the evening in night mode . Yard neighbors benefit from a quiet atmosphere.
aesthetics and durability
The conduit cover near the foundation protects the connections from UV rays and impacts. The stone bed prevents mud from rising up onto the casings and keeps the area dry after rain.
Grants and eligibility (Greater Montreal)
Several Sharp R-32 wall-mounted heat pumps meet the criteria of current programs when the chosen variant is cold climate certified (negative operating range and certified efficiency). We support our customers in Montreal , Laval , Longueuil , North Shore and South Shore for:
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validate the exact eligibility of the installed model;
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provide proof (detailed invoices, photos, serial numbers);
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optimize the heating strategy to maximize savings.
HVAC Maintenance: Keeping Performance at Its Peak
What the owner can do
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Clean the internal filters every 4 to 8 weeks during the season.
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Clear the rear and front of the units (leaves, bags, snow).
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Check the flow of condensate in air conditioning.
What we ensure during the annual visit
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Evaporator/condenser cleaning and fine control of pressure switches ;
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Electrical test (terminal block, currents, grounding);
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Refrigeration check (pressures, superheat / subcooling ), parameter reset and maintenance log update.
Remarkable technical points of this installation in Rosemont
1) Management of brick facade constraints
The anchors are sized for the brick + visible plaster , with waterproof sealing around the holes. A precise setback from the window sills avoids any resonance in the basement .
2) Accessibility and security of service
The disconnects are positioned at an ergonomic height and outside the watering zone. The gravel strip serves as a service mat , allowing maintenance and washing of the fins without dirtying the masonry.
3) Neat finishes
The curved conduit covers at the foot of the wall fit the foundation: clean finish, no sharp edges, stainless steel screws, and continuous slope for condensates.
AirGreen Tips for Montreal Plexes
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Avoid oversizing : Aiming for a low- modulus capacity extends life and keeps parts quiet.
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Maintain clearances : between two condensers side by side, leave sufficient space to avoid recycling the exhaust air.
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Ensure the sealing of the crossings: vapor barrier sleeve and external sealing prevent infiltration and losses.
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Plan maintenance : an annual visit is often sufficient to maintain performance and the warranty .
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Think about winter : clear snow from under units and avoid any stored objects that could obstruct the defrost flow .
Conclusion
This Sharp R-32 single-zone duo project in Rosemont–La Petite-Patrie illustrates our approach: rigorous sizing , installation on anti-vibration brackets , short refrigeration path and durable finishes . The result combines comfort , silence , savings and a yard that remains functional and pleasant. At AirGreen, we support every homeowner in Greater Montreal – Montreal , Laval , Longueuil , North Shore , South Shore – from study to maintenance, for an HVAC installation that keeps its promises.