A three-story brick building, a typical Montreal spiral exterior staircase, nearby balconies, and neighbors all around: this is the perfect setting for a clean, quiet, and sustainable HVAC installation . Our team is working here in Mercier–Hochelaga-Maisonneuve to equip a garden-level apartment with a high-performance heat pump , designed for the Greater Montreal climate and the constraints of an urban plex.
A consistent choice for 4-season comfort
The installed unit belongs to the Gree Clivia R32 range, in a 12,000 BTU configuration. This R-32 family meets the expectations of a medium-sized apartment: stable heating at low temperatures, rapid air conditioning and precise humidity control. The R-32 fluid reduces the carbon footprint and improves seasonal efficiency compared to older generations. Coupled with an inverter compressor, the unit finely adjusts its power, limiting on/off cycles and the noise perceived in the interior courtyard.
Why this range for a Montreal plex?
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High yields useful in mid-season as well as in the middle of winter.
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Low exterior noise level: essential near stairs and balconies.
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Soft start that avoids power peaks, appreciated by unions and owners.
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Compatibility with assistance program criteria when the configuration reaches ENERGY STAR ratings (evaluated project by project in Montreal , Laval and Longueuil , as well as on the North Shore and the South Shore ).
Architectural integration: discretion and maintenance access
The condenser is installed on anti-vibration wall brackets , at a low height, under the flight of the metal staircase. This placement guarantees:
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free air flow (clearances respected on the front and sides);
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partial protection against snow and ice thanks to the overhang near the balcony;
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safe maintenance access without the need for heavy equipment, reducing maintenance costs.
We use calibrated elastomeric pads to break the transmission of vibrations into the brick. The support is anchored to the masonry via mechanical sealing and local vapor barrier, to prevent any water bridges.
Wiring and electrical safety
A weatherproof external disconnect switch is installed within easy reach of the unit. The dedicated power supply (240 V) is routed in metal conduit, neatly attached along the steel upright of the structure. This arrangement makes it easy for any inspector to read the labels and avoids visual clutter.
Optimized refrigeration path in a cramped environment
The refrigeration pipes (approximately 7 m) run along the staircase structure to the drilling point. We cover the lines in a UV-resistant black capping that complements the color of the metal railing: the facade remains clean and harmonious. The drilling through the brick is carried out at a step, with a controlled angle to promote gravity drainage of condensates.
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Insulation : copper tubes insulated with high-density foam, sealed joints and butyl tape to neutralize infiltration.
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Waterproofing : weatherproof sleeve and elastomeric sealant around the core to protect the masonry.
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Condensate : gravity drain with controlled slope towards the outside, discreet black PE pipe, stainless steel clamps. No condensate pump is required here; it's quieter and more reliable in the long term.
Noise management: neighbors and balconies protected
In a courtyard filled with city noise, the acoustic signature of a wall-mounted heat pump matters. We orient the unit to avoid direct airflow toward the stairs and balcony. Maintaining clearances at the rear and sides reduces the risk of hot air recirculation in heating mode, protecting the compressor and maintaining efficiency.
Key points applied
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Silent blocks sized according to the mass of the device.
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Tighten flare nuts to the correct torque to eliminate any whistling.
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Fan balance test and load amperage control.
Installation methodology: AirGreen rigor
Each project follows a protocol that ensures performance and the manufacturer's warranty.
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Load verification and vacuum : we draw a deep vacuum (< 500 microns) then stabilize to confirm the absence of humidity.
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Leak tests : placed under dry nitrogen and pressure drop measured.
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Connections : Caliber sniffing, UV protection, compressed collars and caps.
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Commissioning : reading of parameters, measurement of superheating / subcooling , control of supply/return temperatures.
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Finishing : alignment of the capping , re-doing of the brick joints if necessary, complete cleaning of the work area.
Interior comfort and user control
The wall-mounted fan head (compact format) is positioned to sweep the main room without blowing towards the sleeping area. The low-temperature heating mode stabilizes the feeling of warmth despite the infiltrations typical of plexes. Intelligent defrosting limits interruptions in the middle of winter.
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Filtration : washable pre-filters, quick access hatch for seasonal HVAC maintenance .
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Control : Multi-scenario remote control and Wi-Fi option for programming time slots.
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Efficiency : fine modulation that avoids the 2–3°C variations typical of all-or-nothing systems.
Site constraints and solutions provided
Limited working height under the flight of stairs: we have pre-assembled the brackets to the template to ensure clearances and facilitate water flow.
Frequent traffic to the balconies: lines pass behind the metal stringer to prevent any snagging of parcels or strollers.
Co-presence of other units on the roof and on the facade: coordination of locations to avoid breathing and maintenance conflicts between equipment.
Maintenance and sustainability in Greater Montreal
A well-installed system copes better with Montreal's climate: winds channeled through the alleys, urban dust in the summer, frost in the winter. We recommend:
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Annual HVAC maintenance : cleaning of the exterior exchanger, checking of the fins, electrical testing, upgrading of the fixings.
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Indoor hygiene : quarterly cleaning of filters to maintain static pressure and air quality.
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Winter clearance : Keep 30 cm free around the condenser to avoid the accumulation of snow thrown up by snow removal operations.
Grants and Compliance
Depending on the chosen configuration and the energy rating of the appliance, the project can meet the criteria of the programs applicable in Greater Montreal (to be validated according to the power, seasonal efficiency and the purchase date). Our team supports customers in Montreal , Laval , Longueuil , North Shore and South Shore in putting together the file: proof of installation, technical specifications and required photos.
What the customer gains here
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4-season comfort without excessive electrical backup.
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Controlled bills thanks to inverter modulation and more efficient R-32 .
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Silence respected for neighbors, even in the evening on balconies.
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Aesthetics : straight lines, discreet capping , watertight openings that preserve the brick.
Best practices for your own project
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Favor a gravity route for condensates when the configuration allows it.
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Position the condenser in a ventilated area , away from falling ice.
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Provide a dedicated power supply with a disconnect switch readable from the unit.
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Have the clearances around the appliance checked (wall, guardrail, steps).
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Entrust commissioning to a certified installer who measures and documents the parameters.
Are you considering a wall-mounted heat pump for a Montreal apartment complex? At AirGreen, we tailor the choice of unit (Gree, Sharp, Fujitsu, Midea, etc.) to the actual floor space, the noise tolerance in the courtyard, and access requirements. Our goal is simple: a beautiful, reliable, and efficient system that integrates into your daily life without being intrusive.
Keywords worked on : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore .