A carefully designed project, designed for four-season comfort in a brick plex in Montreal.
Why this installation stands out
In Rosemont–La Petite-Patrie, a young couple wanted a reliable HVAC solution that would provide gentle cooling in the summer and energy-efficient heating in the spring and fall, backing up their main system in the winter. Our team recommended and installed a Gree wall-mounted heat pump —a reliable choice known for its efficiency and quietness—with an outdoor compressor mounted on wall brackets and anti-vibration pads . The result: stable comfort, a more controlled electricity bill, and a discreet integration that respects the area's typical brick aesthetic.
Context: a brick plex, narrow side driveway
The building is a classic Montreal plex with a concrete foundation and red brick cladding. The condenser is located on the side wall, above the concrete slab, in an area protected from occupant movement. This configuration offers:
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good air circulation around the unit;
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clear service access for HVAC maintenance ;
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a reduction in the transport of snow, leaves and dirt to the device.
The device installed: a Gree wall-mounted heat pump
We selected a Gree wall-mounted heat pump from the recent residential range, operating with new-generation refrigerant and a cold profile down to approximately −25°C depending on the series. Without imposing overcapacity, the BTU selection takes into account:
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the surface area of the areas to be treated (main rooms on the ground floor);
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solar exposure and internal gains;
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of the envelope (windows, infiltration, insulation).
This approach avoids oversizing, limits short cycles and stabilizes humidity.
Key points of the Gree wall range:
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inverter compressor for fine modulation;
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quiet operation, suitable for narrow streets and proximity to neighbors;
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easily accessible components for maintenance ;
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compatibility with efficiency programs when eligible (Energy Star and low temperature performance depending on model).
Installation details: clean, rigid, durable
Support and height
The outdoor condenser is fixed on galvanized wall brackets . Two blue anti-vibration pads provide mechanical damping and cut off the transmission of vibrations to the masonry. The raised ground clearance protects the unit:
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accumulations of water and ice;
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shocks (shovels, snow removal);
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dust and debris blown by the wind.
This height also makes it easier to clear the defrost drain in heating mode.
Refrigeration and aesthetic journey
The refrigerant path is short (approximately 3 to 5 m depending on the position of the interior head), which reduces pressure losses and improves seasonal efficiency. The insulated copper connections run through a discreet capping , harmonized with the facade. The assembly is connected by a single small-diameter hole , sealed for air and water tightness.
Electrical connection
The external power supply runs in a compliant metal conduit (EMT) and is securely attached to the wall. A dedicated circuit breaker in the internal electrical panel and a disconnect switch near the unit ensure safety and maintenance. Communication wiring between units is organized and labeled for quick troubleshooting if needed.
Interior integration: comfort and discretion
The wall-mounted head is positioned away from obstacles, with clearance for even distribution. The fins direct the flow without unpleasant drafts. The condensate drain is evacuated by gravity —a simple, reliable, and silent solution—thanks to the difference in level between the indoor and outdoor units.
Performance and acoustics: the tranquility of a residential area
At partial load, the inverter naturally reduces the speed of the compressor and fan: the unit becomes very quiet , a major asset in the alleys of Rosemont. Installation on brackets and pads limits resonance in the brick. We respect the clearances around the front grille to ensure a free air intake and prevent the recycling of hot air in air conditioning mode.
Montreal winter: best practices for wall-mounted heat pumps
To maintain high efficiency when the temperature drops:
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maintain clearance under the unit for melted frost to drain;
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avoid the accumulation of snow under the base (the chosen height contributes to this);
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let the system manage its defrost cycles ;
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keep a clean internal filter, as air restriction reduces COP.
In four-season use, the heat pump handles spring-fall and part of the mild winter; during intense cold, the main system can take over. This hybridization optimizes operating costs.
HVAC Maintenance: Simple, Preventative, Cost-Effective
At AirGreen, we offer annual preventative HVAC maintenance :
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gentle washing of the external battery ;
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checking pressure switches and modulation;
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checking electrical connections and the disconnector;
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drain inspection and cleaning of the inner cassette;
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confirmation of parameters (flow rates, temperatures, delta-T).
Regular maintenance protects the compressor, maintains the manufacturer's warranty , and maintains seasonal performance.
Grants and eligibility in Greater Montreal
Depending on the series and performance level (Energy Star, capacity maintenance at −25°C or above), the Gree wall-mounted heat pump may be eligible for provincial or municipal financial assistance in Montreal , Laval , Longueuil , North Shore and South Shore . We systematically validate the eligibility of the selected model and prepare the required documents to maximize the incentive while respecting the technical requirements.
Construction progress: fast, clean, supervised
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Taking measurements and choosing the location with the client;
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Fixing the brackets, installing the disconnector and the EMT conduit;
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Clean drilling , passage of insulated refrigerant connections;
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Connections , vacuum drawing and leak tests;
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Instrumented commissioning , verification of intensities, superheating/subcooling;
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Customer training : modes, filter maintenance, seasonal advice.
The typical duration of this type of installation is one day, without major interruption to the household's activities.
Results obtained
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Stable and uniform temperature in living rooms;
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Reduced external noise thanks to the inverter and anti-vibration pads;
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Optimized consumption outside of extreme cold;
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Aesthetics respected: cleanly capped conduits, compact equipment, neutral color that blends in with the brick .
AirGreen Practical Tips for a Plex in Rosemont
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Size correctly: it is better to have a device that modulates for a long time than an oversized one that cycles .
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Prefer a short route between units: higher efficiency and fewer losses.
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Choose brackets rather than a slab on the ground when there is snow or a narrow alley.
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Schedule an annual maintenance before the heatwave and a quick check before winter.
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Consider, if necessary, adding a second (multi-zone) head for a remote room: the Gree range offers scalable solutions.
Why AirGreen
We master the constraints of brick buildings and Montreal alleys, clearance management, safe EMT installation, and documented commissioning . Our team supports owners in Montreal , Laval , Longueuil , North Shore and South Shore from selection to maintenance, with neutral recommendations and transparency on actual performance in the local climate.
Next step
Are you considering a similar HVAC installation in Greater Montreal? We evaluate your home, validate grants , size the heat pump , and deliver a clean, long-lasting installation.
Contact us: a technical visit is all it takes to transform your four-season comfort.
Useful keywords: heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Gree , inverter , wall brackets , anti-vibration pads .