Why this installation makes the difference for a brick plex in Montreal
In a typical Montreal plex, mastering comfort requires a device capable of heating efficiently in the heart of winter while providing precise and economical air conditioning in the summer. Here, we are installing a Gree wall-mounted heat pump operating with R-32 refrigerant ( A2L classification), a recent generation that improves seasonal efficiency and reduces the carbon footprint compared to R-410A. Mounted on wall brackets with an aluminum platform and anti-vibration silent blocks , the outdoor unit is perfectly clear of the ground, a wise choice to withstand snow accumulations and defrost cycles. The result: a discreet, stable system ready for the Montreal climate.
The Gree R-32 choice for four-season comfort, without compromise
The Gree R-32 residential range stands out for its modularity, inverter technology, and ability to maintain excellent performance at low temperatures. Paired with a modern wall-mounted indoor unit, it provides precise room-by-room temperature control, tangible energy savings, and reduced noise levels. For owners of duplexes or triplexes in Rosemont–La Petite-Patrie, this ensures consistent comfort, a controlled electricity bill, and simplified maintenance, while remaining eligible for major energy efficiency programs when technical criteria are met.
Client context and objectives
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Building: brick plex with rear courtyard; limited passages and side clearances.
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Needs: reliable heating down to the frequent negative temperatures in Montreal , precise air conditioning in summer, room-by-room control.
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Constraints: vibrations to be controlled (shared wall), ground clearance for snow, careful aesthetics on the alley/terrace side.
Why the Gree wall-mounted heat pump ?
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High seasonal efficiency in heating and cooling mode thanks to the inverter compressor.
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R-32 refrigerant: better volumetric capacity, reduced charge and lower global warming potential than R-410A.
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Extreme cold operation in adapted versions; ideal for Greater Montreal (including Laval , Longueuil , North Shore and South Shore ).
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Advanced control electronics: fine modulation, optimized defrosting, energy standby.
Installation details: rigor and durability
Vibration support and control
We install the outdoor unit on sturdy wall brackets with an aluminum tray . Blue anti-vibration pads are placed under each support point. This combination:
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filters micro-vibrations transmitted to the masonry;
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protects the fasteners during inverter cycles (speed increases/decreases);
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improves the acoustic comfort of the immediate neighborhood.
The tray height creates optimal clearance for snow, runoff and defrosting, while facilitating fan and coil maintenance.
Drilling and refrigeration routing
The refrigeration connections, the condensate drain and the communication cable are routed through a through-hole in the brick. Inside, the wall head is positioned for efficient air sweeping without direct blowing onto the occupants. Outside, the path is reduced and protected; the tube curvature radii are respected to preserve the load and the compressor's longevity.
Waterproofing and fixing
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Anchors suitable for solid brick, placed on joints to prevent bursting.
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Hermetic sealing of the drilling (foam + mastic) to cut off air and moisture infiltration.
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Refrigeration service loop provided for future interventions without mechanical constraints.
Connections and commissioning
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High vacuums up to the required thresholds, leak test by prolonged vacuum draw.
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Checking the currents and polarity at start-up, setting the remote controls and the set temperature.
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Instructions for use: clearances around the unit, cleaning of the internal filter, automatic defrosting explained to the customer.
Performance, comfort and acoustics
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Inverter modulation finely adapts power: the heat pump avoids unproductive on/off cycles and maintains a stable temperature.
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The helical fan and grille geometry reduce turbulence; the addition of silent blocks reduces structural transmission, useful in a terraced building in Rosemont.
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In summer, automatic dehumidification increases the perceived comfort: a set point of 23–24°C is often sufficient to ensure well-being, limiting consumption.
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In winter, the heating curve remains strong down to low temperatures (depending on the version), with electrical support rarely necessary if the appliance is properly sized.
Safety, R-32 and good practices
R-32 is an A2L refrigerant: low toxicity, limited flammability. Our implementation complies with:
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limit loads depending on the volume of the room;
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minimum ventilation of premises and installation heights;
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the safety signage visible on the unit.
We recommend a snow guard if necessary (roofs with a steep cornice) and annual maintenance: visual inspection, cleaning of exchangers, verification of intensities and service pressures.
Aesthetic integration and maintenance
In a high-density neighborhood like Rosemont–La Petite-Patrie , careful layout is as important as technology:
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Alignment of exterior conduits, discreet wall crossing .
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Height calculated to clear mowing/snow removal.
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Service access maintained for the technician without encroaching on traffic areas.
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Controlled noise at night thanks to the “quiet” mode available on most Gree wall heads.
Maintenance side:
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Clean filters every 4–6 weeks during periods of heavy use.
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Clear the back and sides of the outdoor unit (minimum recommended by the manufacturer).
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Avoid textile protection or waterproof tarpaulins in winter: they hinder defrosting and ventilation.
Grants and Eligibility
Recent high-efficiency wall-mounted heat pumps , especially those capable of heating to -25°C / -30°C , are often eligible for current Quebec programs (depending on exact criteria, power and performance). Our advisors verify:
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the presence of an AHRI number corresponding to the head/condenser pairing;
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the required SEER/HSPF/SCOP coefficients;
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installation requirements (clearances, controls, photo documents).
AirGreen supports the preparation of files for our clients in Greater Montreal : Montreal , Laval , Longueuil , North Shore , South Shore .
Pitfalls to avoid (feedback from the field)
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Brackets too low : the unit becomes trapped in the snow. Mounting on brackets permanently solves the problem.
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Poorly sealed holes : internal condensation and heat loss. We systematically seal and insulate.
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Over-tight refrigeration loops : noise and risk of micro-leaks in the long term. Our installers ensure proper radii and mechanical clearances.
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Undersizing : the room does not heat up in extreme cold; conversely, oversizing reduces efficiency. We size based on the actual thermal load of the home.
Result at the customer
Once commissioned, the customer enjoys consistent comfort and a reduced energy bill. The outdoor unit is stable, quiet, and protected. The wall-mounted head ensures even air distribution and smooth regulation. The system meets the requirements of a Montreal plex: reliability, discretion, R-32 safety, and a clean HVAC system .
What we bring in addition
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Implementation engineering adapted to Montreal buildings (brick, adjoining walls, narrow courtyards).
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Installation quality : sturdy metal supports, careful fixings, vacuum and leak testing.
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Complete service : advice on subsidies , maintenance, and after-sales assistance throughout Montreal , Laval , Longueuil , North Shore and South Shore .
For a similar project—replacing an existing air conditioner, adding a heat pump for supplemental heating, or upgrading to R-32 —our team plans a durable, safe installation ready for Quebec winters.
Natural keywords : heat pump , wall-mounted heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Gree R-32, Inverter, A2L, wall brackets, anti-vibration, brick plex.
Short FAQ
Is this installation suitable for a similar duplex in Villeray or Plateau?
Yes, the approach (brackets, clearances, through drilling, vibration control) adapts very well to the dense plexes of the island of Montreal .
Does R-32 change maintenance?
The operations remain comparable; we simply respect the practices specific to A2L refrigerants (ventilation, signage, compatible tools).
Can we integrate multiple heads?
Yes, Gree R-32 MultiZone versions exist when multiple rooms need to be treated; a load calculation is required to size the exterior and the line network.
In conclusion
This Gree R-32 wall-mounted heat pump installed in Rosemont–La Petite-Patrie exemplifies what we stand for: thoughtful installation, quiet operation, measurable energy savings, and durability designed for Montreal winters. At AirGreen, we design each HVAC installation to seamlessly integrate with your building and your daily life, both today and ten years from now.