A robust installation on a brick facade for four-season comfort in a Montreal plex
In a typical Montreal plex, the occupant wanted a discreet system capable of providing air conditioning in the summer and efficient heating support in mid-season and during winter thaws. We recommended a Gree wall-mounted heat pump , R-32 refrigerant , selected from the manufacturer's recent residential range (single-zone model). The choice was obvious for three reasons: interesting seasonal performance, quiet components, and compatibility with energy efficiency programs when the configuration meets the criteria.
Analysis and sizing: the basis of a reliable HVAC installation
Before any HVAC installation , we carry out a precise survey: surfaces to be treated, actual insulation (walls/ceiling), windows, internal contributions, and electrical constraints. On this site in Villeray–Saint-Michel–Parc-Extension , the ground floor has an open living area with regular clearances; the load calculation leads us to a typical wall capacity of 9,000 to 12,000 BTU . We then validate:
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the availability of a circuit dedicated to the electrical panel (size, circuit breaker, free space);
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the best location of the interior head for even diffusion without direct blowing on the occupants;
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the shortest and most aesthetic route for refrigeration connections and condensate drainage (priority to gravity drain ).
Exterior installation on brick facade: stability, silence, durability
The Gree outdoor unit is installed on a brick facade. We use high-capacity galvanized wall brackets with anti-vibration pads and anchors suitable for masonry (mechanical or chemical anchors depending on the strength of the joint). This configuration:
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clears the ground (snow, snow removal, traffic);
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ensures proper clearances around the fan and exchanger;
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reduces the transmission of vibrations into the structure.
We check the horizontality with a laser level and the water discharge slope under the device to avoid any runoff onto the brick. An external disconnect (disconnect box) is installed nearby, in accordance with the Code.
Refrigeration lines and exterior finish: clean and protected
The copper lines are continuously brazed and insulated (closed-cell foam, sealed junctions). For aesthetics, we use a rigid UV-resistant line cover to protect the insulation and guide the path to the penetration point. We limit the equivalent length and elbows to preserve the fluid charge and efficiency . Nitrogen priming during brazing prevents internal oxidation; a leak test (≈ 300 psi) is followed by a deep vacuum (≤ 500 microns) before opening the valves.
Condensate management: priority to gravity
The internal head is installed in such a way as to promote a gravity drain with a continuous slope towards the outside. When the internal configuration requires it (long route, rise), we integrate a compact condensate pump , mounted anti-vibration and equipped with a non-return valve. The objective remains the same: zero drips and zero odors , summer and winter.
Commissioning and performance checks
After the electrical checks, we proceed with the commissioning :
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reading of blowing and suction temperatures , intensity and pressures;
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verification of inverter modulation (progressive rise/fall, stability of instructions);
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testing the shutters and dehumidification mode for heavy days;
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remote control settings (programming, locking, eco, auto restart after power off).
The operation is particularly quiet : the chosen location limits reverberation on the brick and avoids “air noise” on the rear terrace.
Why Gree (R-32) for this type of housing?
Gree's single-zone R-32 range combines efficiency and compactness. The advantages for a Montreal plex:
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High mid-season COP and competitive SEER ;
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stable inverter components, promoting long cycles at low speeds and therefore constant comfort ;
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compatibility with refrigeration lines of reasonable length (between 3 and 15 m depending on the model) without significant loss;
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controlled exterior noise levels , appreciable in shared alleys and courtyards.
Result: immediate comfort and controlled bill
Upon switching on, the room quickly reaches the setpoint without unpleasant drafts . The heat pump takes over basic heating during the off-season, reducing the need for electric baseboard heaters. In summer, the Dry mode significantly improves perceived comfort by lowering humidity without overcooling.
HVAC Maintenance: Actions That Prolong Performance
To maintain performance:
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clean the internal filters every 4–8 weeks during intensive periods;
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have periodic professional cleaning carried out (evaporator, turbine, tank, drain);
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inspect the line cover and collars after winter (freezing/thawing);
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keep the outdoor unit clear (snow, leaves) and provide a snow guard or deflectors if necessary depending on the wind direction.
Grants and eligibilities in Greater Montreal
Certain Gree Energy Star and cold climate configurations are eligible for incentives when performance thresholds are met (power, operating temperatures, compliant installation). We support our customers in Montreal , Laval , Longueuil , North Shore and South Shore to validate eligibility, gather evidence (serial numbers, installation photos, certificates) and submit applications.
Common pitfalls to avoid (AirGreen feedback)
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Undersizing or oversizing: the right capacity avoids cycling and cold spots.
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Excessive line travel : pressure drops, fluid noise, reduced efficiency. We remain within the manufacturer's optimal window.
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Uncertain drainage : gravity is king; the pump is just a perfectly integrated plan B.
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Unsuitable fixing to the brick : we use the appropriate anchors (pull-out tests, controlled tightening torque).
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Absence of disconnect or undersized wiring: non-compliance and risk of tripping.
Usage tips for optimal comfort
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Maintain stable setpoints (e.g. 23°C in summer, 21°C in mid-season) to take advantage of the inverter.
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Adjust the shutters to circulate the air above the passageways.
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During a heatwave, start Dry mode in the early afternoon to lower the humidity before the heat peaks.
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In winter, regularly check the suction/discharge freedom of the outdoor unit (snow, ice).
Our AirGreen methodology in Villeray–Saint-Michel–Parc-Extension
Each project follows our quality checklist : sizing, electrical validation, seals, nitrogen testing, deep vacuum, progress photos, commissioning with measurements, and submission of a report to the client. This rigor ensures a durable HVAC installation , performance compliant with technical data sheets, and peace of mind for occupants.
In summary : a Gree R-32 range wall-mounted heat pump , installed on wall brackets with careful finishing and controlled drainage, provides four-season comfort and an optimized energy bill. In Montreal , Laval , Longueuil , on the North Shore and South Shore , we take care of your project from A to Z: advice, installation, eligibility documentation and HVAC maintenance . Let's talk about your home, your budget and the best options for your lasting comfort.