A discreet and efficient HVAC upgrade for four-season comfort
Residential context and comfort objectives
At AirGreen , we work weekly on homes and plexes in Greater Montreal to modernize thermal comfort with new-generation heat pumps . In Chomedey (Laval) , our client wanted a quiet, energy-efficient solution that was not visible from the yard. We offer a compact HVAC installation around a recent GREE outdoor unit ( R-32 refrigerant), sized to meet the winter supplemental heating and summer cooling needs of a garden level.
Why GREE for this project?
GREE offers a proven range of wall-mounted units (Livo/Clivia/Vireo/Sapphire R-32, etc.) with very good seasonal coefficients and reliable performance in cold weather. For this type of Laval home, these units combine:
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high efficiencies (advantageous SEER/SCOP) for real electricity savings;
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fine modulation of the inverter compressor speed to limit starts and noise;
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compatibility with grant programs when the criteria for extreme cold heat pumps are met.
Here we have chosen a single-zone wall unit format, ideal for targeting the main living area without invasive duct work.
What we achieved on site
Strategic positioning of the external unit
The GREE unit is installed on galvanized wall brackets to clear the floor and preserve the paving. This approach addresses three local challenges:
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Snow-free : placing it 40–45 cm from the ground protects the device from winter accumulations and facilitates the evacuation of defrost water.
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Maintenance : the free space under the device creates a real service corridor , useful for cleaning the fins and seasonal inspections.
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Longevity : the absence of contact with the slab limits rising damp and premature corrosion.
The unit is oriented to maintain generous front clearance for air intake/discharge, while respecting the proximity of a louvered fence . We systematically aim for the manufacturer's recommended clearances (sides/rear/front), ensuring performance and low noise.
Fixings and anti-vibrations
The structural brackets are anchored to the masonry using mechanical/chemical anchors sized according to the load. We add anti-vibration pads to decouple the unit from the foundation wall:
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reduction of structural transmissions;
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acoustic comfort inside, particularly near the basement window visible on site.
Refrigerated connections and discreet route
We favor a short and clean route between the outdoor unit and the indoor head:
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insulated refrigeration connections (insulated copper) of approximately 6–8 m for this house;
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clean drilling with vapor barrier sleeve and controlled slope to prevent any infiltration;
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path protected, if necessary, by UV conduit covers for careful visual integration.
This simple route limits load losses, optimizes seasonal efficiency and simplifies any future intervention.
Condensate management and winter protection
On the inside, drainage is by gravity when the architecture allows it; otherwise, we integrate a silent condensate pump with a check valve. Outside, the ground clearance and orientation prevent ice from forming under the machine. As an option, we offer a snow guard on exposed or north-facing sites.
Power supply and compliance
Our licensed electricians provide wiring (dedicated circuit breaker, service/disconnect box) according to code, with insulation testing of refrigeration lines, deep vacuum (< 500 microns) and R-32 charging strictly according to GREE specifications. We document each step (measurement sheets, serial numbers) for warranty and future maintenance.
Sizing and performance: our method
Thermal balance and capacity selection
We don't just "install" a wall-mounted air conditioner by chance: we size it . In Chomedey, semi-basement houses have specific thermal loads (partially buried walls, moderate solar gain, infiltrations bordering garages/driveways).
Our team:
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measuring glass surfaces , orientations and insulation levels;
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takes into account regional calculation temperatures (winter, summer);
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targets a power rating that will modulate 90% of the time rather than oversize.
The result: a GREE wall-mounted heat pump capable of providing air conditioning for the living area, providing additional heating in the fall/winter and switching to defrost without any noticeable discomfort.
Acoustics and neighborhood
The choice of fan speeds and night mode reduce noise disturbances in the evening, a crucial factor in dense residential areas. The bracket mounting, combined with the silent blocks, reduces vibrations felt on the facade and in the basement room.
What the customer gains on a daily basis
Four-season comfort
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Summer : rapid temperature reduction with limited stratification thanks to air sweeping and inverter modulation .
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Mid-season : maintaining a pleasant humidity level , a source of perceived comfort.
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Winter : Competitive cost heating compared to electric baseboards, particularly in moderate temperatures.
Energy savings and environmental impact
With R-32 (lower global warming potential than R-410A) and high seasonal efficiencies , the electricity bill shrinks. On a typical Laval profile, we often observe 20–35% annual savings on air conditioning/supplementary heating, depending on usage and insulation.
Simple and planned maintenance
We offer annual HVAC maintenance :
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cleaning the filters and the interior evaporator;
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gentle washing of the condenser fins ;
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checking electrical connections , condensate drainage and refrigeration sealing.
This routine prevents overconsumption and extends the life of the equipment.
Remarkable technical points of this installation in Chomedey
Integration into the courtyard layout
Laying on existing paving required a controlled setback from the wooden vegetable bed . We chose an adjusted bracket spacing for:
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keep the airflow free on the facade;
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maintain a passage for watering and maintaining the garden;
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avoid any recycling of hot air against the fence.
Waterproofing and finishing
The drilling through the foundation is sealed (exterior class mastic) with a vapor barrier . The surrounding finishes limit thermal bridges and prevent the entry of water or rodents.
Safety and Service
The external disconnect is located within reach but protected from watering. The height allows the technician to work without contorting themselves, which reduces service time and therefore costs over time.
Grants and eligibility (Montreal, Laval, South Shore, North Shore)
Many GREE R-32 wall-mounted heat pumps meet the thresholds required by Quebec programs when they are classified for cold climates (negative operating range and certified efficiency). We advise and, if necessary, provide support for:
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verification of eligible model numbers ;
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preparation of proof of installation ;
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optimizing the heating strategy (setpoint curves) in order to maximize savings in your residences in Montreal , Laval , Longueuil , North Shore and South Shore .
Preventive maintenance: our AirGreen tips
To be done by the owner (every 4–8 weeks in season)
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Rinse the inner head filters .
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Clear the outer fins (leaves, dust).
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Check that nothing is obstructing the space under the unit (snow, tools, pots).
To be entrusted to AirGreen (once a year)
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Deep cleaning of the evaporator/condenser.
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Electrical inspection and tightening.
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Refrigerant check (pressures, superheat/subcooling).
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Update settings (silent modes, scheduling).
Why so many households in Chomedey choose us
Our difference lies in the method : a thermal diagnosis , accurate sizing , careful installation (brackets, anti-vibration, sealing), and documented service . Result: a heat pump that keeps its promises of savings and comfort, without surprising your neighbors or spoiling your yard.
Do you have a similar project?
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , our HVAC team designs and installs GREE, Fujitsu, Midea, Sharp and other recent brand wall-mounted solutions with R-32/R-454B . Let's talk thermal load , subsidies and schedule : we manage everything, from the first visit to annual maintenance.
Quick Fair (useful before writing to us)
Which power should I choose?
We calibrate according to your surfaces, glazing, and habits. Unlike oversizing, a well-targeted capacity is low- modulated and remains silent.
Brackets or slab?
In residential areas in Laval, the bracket option is ideal for snow removal and maintenance. We recommend slabs, especially when the facade does not allow for optimal anchoring.
Noise perceived?
With a recent GREE inverter and our silent blocks , the exterior noise level is very contained; in night mode, it drops even further, easily respecting the neighborhood.
Mandatory maintenance?
Essential for maintaining performance and warranty . Our AirGreen plan simplifies logistics with scheduled appointments.
Conclusion
This GREE installation in Chomedey illustrates our approach: a recent R-32 wall-mounted heat pump , carefully installed on brackets for long-lasting performance , controlled acoustics and discreet integration into the courtyard layout. At AirGreen, we make each project a local reference in HVAC installation .