A clean, neat project designed for our Montreal winters
At AirGreen , we install efficient and durable wall-mounted heat pumps on a daily basis in Greater Montreal. In Rosemont–La Petite-Patrie, we recently replaced an old air conditioner with a Gree R-32 single-zone unit, chosen for its performance, quiet noise, and compatibility with current low-GWP refrigerant requirements. The work illustrates our approach: rigorous preparation, clean finishes, and an outdoor installation on a raised base to ensure reliable operation even during snow and ice.
Client context and objectives
The owner of a Rosemont duplex wanted:
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four-season comfort without excessive increases in the electricity bill;
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quiet operation so as not to disturb the backyard;
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an outdoor installation away from snow with easy access for maintenance;
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a clean integration on a side sheet metal cladding and near an external spiral staircase.
After a consultation visit, we recommended a Gree wall-mounted unit from the R-32 range , sized for an open living area and an adjacent bedroom. The final selection took into account Montreal 's real-world needs for supplemental heating and summer cooling, with a priority on seasonal efficiency and longevity .
Outdoor installation: stability, clearances and snow protection
Snow-proof bases and pedestals
We place the outdoor unit on two leveled concrete slabs , receiving a raised aluminum support . This configuration:
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keeps the casing at the correct height above the ground (clearance for snow accumulation);
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mechanically decouples the device from the ground using anti-vibration pads;
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ensures correct drainage of condensates in summer, without splashing.
Clearances and air circulation
The Gree axial fan requires a clear air volume to condense efficiently. We maintain margins at the front and sides for:
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avoid recycling hot air in summer;
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limit the risk of frost in auxiliary heating mode;
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facilitate maintenance maneuvers (access to panels, valves, fittings).
Refrigerant line and power supply management
The cable tray exits laterally, is covered with UV capping and runs with a regular slope towards the wall penetration. This short path limits:
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pressure losses and weak points;
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exposure to shocks around the exterior staircase;
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thermal bridges and direct solar heating.
When the configuration requires it, we integrate an external disconnector according to the code in force to secure interventions. The whole remains sober and discreet , in harmony with the materials present (sheet metal and brick).
AirGreen Methodology: Invisible but Decisive Quality
Flaring, brazing and sealing
We prepare the copper connections in the workshop and then on site, with:
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clean deburring and controlled flaring;
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nitrogen brazing when necessary to prevent internal oxidation;
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dry nitrogen pressure test for several hours to detect any microleaks.
Deep vacuum sealing
Before opening the valves, we perform a vacuum draw down to a level of 500 microns (or better), followed by a lift test . This step guarantees:
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the absence of humidity and air in the circuit;
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the stability of R-32 refrigerant and the longevity of the compressor;
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optimal performance from the start-up.
Performance setting and monitoring
When starting up , we check:
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the absorbed intensity and the compressor response;
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the supply/return temperatures on the interior side;
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stability of defrosting in auxiliary heating mode;
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the noise level perceived in the backyard and in the home.
We provide the customer with a brief user guide (modes, filters, basic maintenance) and our service contact details for annual follow-up.
Why a Gree in R-32 for Rosemont?
Low GWP refrigerant and modern efficiency
Gree's R-32 range offers reduced global warming potential compared to R-410A generations and allows for higher seasonal efficiencies with inverter compressors. For an apartment or duplex in Rosemont, it is a relevant choice for:
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air conditioning from May to September;
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supplementary heating in autumn and spring;
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controlled noise on the facade or in the courtyard.
Acoustic and aesthetic comfort
The compact housing, optimized fan blades and electronic motor management allow for quiet operation. The raised mounting reduces structural resonances while providing the necessary clearance under the unit.
Simplified maintenance
The exterior cover protects the connections from UV rays and rain. On the interior side, simple and regular filter maintenance maintains performance. AirGreen offers preventative inspections to preserve seasonal performance over the years.
Sizing and good HVAC installation practices
The right BTU for the right room
We size the power (BTU/h) based on the useful surface area , insulation , orientation and internal inputs . Oversizing leads to short cycles and premature wear; undersizing reduces comfort during hot periods . Our technical visit establishes the ideal balance point for your home in Montreal , Laval , Longueuil , North Shore or South Shore .
Controlled lengths, slopes and drillings
Copper connections must remain within the manufacturer's recommended range . We optimize slopes for condensate drainage (gravity where possible) and limit the number of elbows . The drilling is carried out carefully, insulated and sealed to prevent any infiltration.
Winter protection
The raised base protects against snow ridges. We validate the snow removal routes and the absence of obstacles in front of the air intake . If necessary, we add snow guards or adjust the orientation of the unit to limit vortices in gusts.
Grants and eligibility: how to find your way around
Several programs encourage the improvement of energy efficiency . Depending on the exact model and its certified performance , a wall-mounted heat pump may be eligible for assistance (provincial, municipal or utility programs). We verify, on a case-by-case basis, the eligibility of the chosen configuration ( cold test standards, Energy Star , performance thresholds). Our team supports the client in gathering evidence (certification numbers, photos, detailed invoices) and submitting the files correctly.
Result: stable comfort, controlled manufacturing and clean finish
In Rosemont–La Petite-Patrie, the Gree R-32 installed by our teams delivers:
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a regular temperature in the living area and the adjoining bedroom;
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a significant drop in humidity in summer;
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low noise level in the backyard;
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a clean, perfectly level installation , ready for annual maintenance .
The customer appreciates the simple control and responsiveness of the system during heat peaks . In mid-season, the heating function relieves the electric radiators, which helps to control operating costs .
HVAC Operation and Maintenance Tips by AirGreen
To do
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Leave the outdoor unit clear (50–100 cm free in front of the grille).
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Clean the inner head filters every 4 to 8 weeks in summer.
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Schedule an annual preventive visit : check electrical parameters , vacuum , load , and clean the evaporator and condenser .
To avoid
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Obstruct the front of the condenser (bins, furniture, bicycles).
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Allow snow to accumulate under the air intake in winter.
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Turn off the power supply at the disconnect switch without reason (risk of loss of settings and abnormal cycles).
Why entrust your HVAC installation to AirGreen?
We cover Montreal , Laval , Longueuil , North Shore and South Shore with teams trained in best practices for manufacturers. Our strengths:
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careful pre-study , correct sizing;
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careful execution (deep vacuum, pressure tests, hooded finishes);
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support for subsidies and structured after-sales service ;
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respect for deadlines and the built environment (surfacing, access, neighborhood).
Are you considering a Gree, Fujitsu, Sharp, or Midea wall-mounted heat pump ? We offer solutions tailored to Montreal homes , transparent pricing , and state-of-the-art installation that's durable, safe, and aesthetically pleasing.
Project Quick Facts (Technical Summary)
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Market : residential — duplex in Rosemont–La Petite-Patrie .
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System : Gree single-zone wall-mounted heat pump ( R-32 range).
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Installation : condenser on raised base fixed on slabs ; UV capping ; short and clear path; compliance with clearances .
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Procedure : Nitrogen pressure test , deep vacuum , complete commissioning .
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Objectives : four-season comfort , silence, winter reliability, easy HVAC maintenance .
Ready for a clear and quick quote?
At AirGreen, we evaluate your home, confirm the sizing , document potential eligibility for assistance , and carry out a clean installation that will survive Montreal winters without any surprises. Contact us to schedule a technical visit and obtain a detailed proposal, at the right price, as soon as possible .