A precise and careful HVAC installation for four-season comfort in an urban environment
At AirGreen , we have just completed the installation of a Gree wall-mounted heat pump in a duplex in Rosemont–La Petite-Patrie (Montreal) . The project perfectly illustrates our approach to working in a dense residential environment: rapid intervention, discreet integration on the facade , respect for service distances and optimization of heating and cooling performance . The result: a reliable, quiet and efficient system, designed for Montreal winters and humid summers.
Client context and objectives
The owner wanted:
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Replace a window air conditioner with a reversible solution capable of providing supplemental heating in the fall and spring.
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Reduce your electricity consumption with a high-efficiency inverter compressor.
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Preserve the aesthetics of the courtyard and minimize noise for the immediate neighborhood.
After a thermal assessment of the main rooms and a technical visit, we recommended a single-zone Gree wall-mounted heat pump , operating with R32 refrigerant , renowned for its good efficiency/reliability ratio and its resistance to cold.
Installation details: precision, silence and durability
Exterior installation on wall brackets
The outdoor unit is mounted on sturdy wall brackets , equipped with anti-vibration pads . This configuration:
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Raise the device for sufficient ground clearance in winter (snow, ice).
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Limits the transmission of vibrations to the masonry.
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Facilitates maintenance and rear clearance for optimal ventilation.
Secure electrical management
In the immediate vicinity of the device, we have positioned a code-compliant disconnect box (safety switch). The sheathed wiring follows a neat vertical route to the power point, with a service loop to avoid any mechanical stress and facilitate future work.
Short, insulated refrigerant lines
The insulated copper lines take a direct route (≈ 2 to 3 m) between the outdoor unit and the indoor head, in order to:
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Reduce heat loss and maximize seasonal efficiency.
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Limit refrigerant volume and simplify leak checks.
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Provide a clean aesthetic thanks to a perfectly closed white UV cover , silicone seals at the crossings and spaced collars for a lasting hold.
Condensate drainage by gravity
The condensate drain is routed by gravity , without a pump, to increase reliability. A continuous slope is checked with a level, and the outlet is protected against backdraft and freezing.
Respect for existing elements on the facade
The facade already had air outlet caps (dryer/air exchanger). We organized the installation of the outdoor unit in such a way as to preserve the required clearances , avoid recirculation and maintain access to this equipment, while aligning the covers for a harmonious visual reading.
Technical choice: the safe bet of a Gree Inverter with R32
Opting for a Gree Inverter with R32 addresses several challenges for Montreal households:
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High seasonal efficiency in air conditioning and good maintenance of heating capacity at low temperatures.
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R32 refrigerant with lower GWP than R410A, contributing to a more responsible environmental balance.
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Quiet operation , thanks to a modulating fan and compressor that adjust finely to the load.
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Simplified HVAC maintenance with accessible components and clear diagnostics.
For a duplex or condo type home, this translates into stable comfort , fewer sudden starts/stops and an optimized electricity bill over the year.
Key stages of the construction site: from technical visit to commissioning
1) Taking measurements and validating the holes
We validate the exact position of the interior head , the wall crossing (diameter, slope), the proximity of the electrical panel and the location of the disconnection box . This preparation limits unforeseen events, reduces the duration of the work and avoids rework .
2) Drilling and protection
The drilling is carried out with a controlled outward inclination , a watertight bulkhead and a sleeve to protect the connections. A UV- and frost-resistant exterior sealant completes the seal.
3) Installation of the outdoor unit and alignments
Wall consoles are mechanically anchored to the structure. We check the level , ventilation clearances , blowing orientation with respect to obstacles and service distance for maintenance.
4) Brazing, vacuuming and checks
The joints are silver-brazed when required, then we perform a high vacuum with a micron gauge to ensure the absence of moisture and air. A leak test and torque check complete the procedure.
5) Power-up and functional tests
After electrical connection and calibration , we test both modes (cold/heat), check blowing temperatures , intensities , noise and drainage . The customer receives the operating instructions and maintenance intervals .
Result: immediate comfort, preserved aesthetics, performance as expected
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In summer, the target room quickly reaches the setpoint, without unpleasant drafts, thanks to Inverter modulation .
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In mid-season and in moderate cold, the heating function reduces the use of baseboards, which reduces the bill .
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The facade remains orderly , the noise level is contained, and access for maintenance remains easy.
HVAC Maintenance Tips for Maximum Longevity
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Clean the inner head filters every 4 to 8 weeks during periods of heavy use.
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Clear 50 to 60 cm around the outdoor unit for good air intake.
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Check the drain at each change of season to avoid overflows.
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Annual inspection by our technicians: electrical checks, pressure/load, condition of the insulation, tightening of connections, and washing of the exchangers.
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In winter, after a snowfall, clear the snow from under the unit (if necessary) to preserve airflow.
Grants and local compliance
High-efficiency wall-mounted heat pumps are generally eligible for assistance programs in effect in Quebec. We assist our clients in preparing files , maintaining AHRI numbers , and verifying performance criteria (cold weather heating, seasonal efficiency). Our team also ensures electrical compliance and municipal requirements specific to Montreal and the cities of the North and South Shores .
Why AirGreen for your installation in Montreal, Laval and Longueuil
Our strength lies in:
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Field expertise on flat roofs, wooden facades, bricks, cladding and complex configurations.
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Standardized, documented and controlled HVAC installations (commissioning checklists).
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Accessible after-sales service, with parts and warranties managed efficiently.
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Clear planning : precise quote, choice of BTU rating , management of cable glands , and deadlines met.
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we offer a heat pump solution adapted to your building, with a clean finish and measurable performance.
Summary technical sheet (for information purposes only)
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Type : single-zone wall-mounted heat pump (reversible wall-mounted air conditioner ).
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Brand : Gree .
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Technology : Inverter , R32 refrigerant.
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Outdoor installation : wall consoles with anti-vibration pads, standardized clearances.
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Connections : short (≈ 2–3 m), white UV cover, careful sealing.
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Power : nearby disconnect box, ducted wiring, service loop.
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Condensates : gravity with continuous slope.
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Noise : low at nominal load, benefit from Inverter modulation.
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Maintenance : regular filters + annual inspection recommended.
Conclusion
This Gree wall-mounted heat pump installation in Rosemont–La Petite-Patrie embodies our commitment: clean work , consistent performance , and support that simplifies the homeowner's life. Are you looking for a durable HVAC installation adapted to Montreal 's climate? We are ready to advise you, from BTU selection to commissioning and maintenance.