A clean, quiet HVAC system designed for the long term
At AirGreen , we have just installed a Gree R-32 wall-mounted heat pump in a home located in Saint-Léonard (Montreal) . The work took place on a concrete terrace adjoining a brick wall, a configuration typical of plexes in the area. The client's objective: to efficiently cool the living area in the summer and benefit from additional heating in the fall and spring , while controlling operating costs.
Background, sizing and choice of equipment
The real need of the customer
The accommodation features an open-plan living space opening onto a patio door . The late afternoon sunshine quickly raises the temperature. The owner wanted:
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stable comfort without drafts,
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a minimal noise level ,
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an energy-efficient solution and eligible for assistance programs where applicable.
Why a Gree wall-mounted heat pump (R-32) ?
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High seasonal efficiency thanks to the inverter and R-32 refrigerant, more efficient and with a lower GWP than R-410A generations.
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Cool weather reliability for Montreal's off-season.
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Compact condenser format making it easy to install on a terrace.
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Accessible components for fast and cost-effective HVAC maintenance .
Sizing (BTU): the AirGreen method
We never oversize. We validate surface area, orientation, insulation, infiltration and occupancy habits . This approach avoids short cycles , reduces consumption and extends the lifespan. The chosen model covers the living area (living room-dining room-kitchen) with sufficient margin during heat peaks while providing additional heating when the outside temperature allows it.
Installation details: rigor and aesthetics
External positioning
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Raised condenser on aluminum support with anti-vibration pads placed on the concrete slab. This elevation improves air circulation , simplifies winter de-icing and protects the equipment from the accumulation of snow and debris.
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Waterproof outdoor electrical disconnect installed nearby, in accordance with the Quebec Construction Code and CMEQ best practices.
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Clearance distances respected around the blower grille to prevent any recirculation of hot air.
Refrigeration and finishing
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Two vertical brick-brown capping columns guide the refrigeration lines and power cable from the condenser to the penetration point. This color choice matches the cladding and effectively conceals the ducts.
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Clean drilling in the brick with bulkhead and silicone seal to cut off air and water infiltration.
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Optimized pipe length (short route, without unnecessary bends) to limit pressure losses and maximize efficiency .
Condensate management
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Gravity drain with dedicated outlet to the outside. No condensate pump , therefore less noise , less maintenance and less risk in the event of a power failure.
Interior: comfort and silence
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Wall-mounted head installed to sweep the living area without blowing directly onto the occupants.
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Damper adjustments and flow calibration carried out during commissioning to achieve minimal stratification and temperature homogeneity .
Construction site challenges and AirGreen solutions
1) Preserve the aesthetics of a visible facade
The red brick wall is visible from the terrace. We have:
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favored a brown capping with a square section, aligned with the existing electrical equipment,
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maintained a clean vertical line for an architectural rendering.
2) Control vibrations on the slab
The concrete terrace easily transmits vibrations. The rigid aluminum support + anti-vibration pads duo reduces transmission to a minimum . The Gree condenser fan and the inverter algorithm limit sudden variations in speed—hence discreet operation .
3) Penetration and sealing in masonry
Brick requires precise drilling to maintain the integrity of the facing. We used a sleeve and a carefully pulled sealing bead , which:
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eliminates air bridges ,
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avoids the influx of humidity ,
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improves the overall performance of the heat pump .
Commissioning: measurements and checks
During startup, our technicians proceed to:
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Deep vacuum and leak test ,
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Checking the circuit breaker currents and rating,
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Reading of suction/discharge temperatures and blowing deviations ,
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Setting of modes (cooling, heating, dehumidification) and automatic restart after power cut.
The result: rapid cold blowing in air conditioning mode, very low interior noise level and smooth setpoint stability . The customer immediately notices a drop in perceived humidity , therefore an increased feeling of comfort at the same temperature.
What the owner earns in the first season
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Energy savings compared to a traditional air conditioner thanks to the inverter and R-32 .
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Four-season comfort : air conditioning in summer, additional heating in spring and fall without systematically using the main system.
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Quiet : the indoor unit operates at low speed to maintain the setpoint; the terrace remains peaceful .
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Healthier air : increased filtration and dehumidification mode limiting mold and odors .
HVAC maintenance: our tips for maintaining performance
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Clean the wall head filters every 4 to 6 weeks in summer.
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Clear the condenser in spring and autumn (leaves, dust, pollen).
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Winter de-icing : never block water drainage holes.
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Annual maintenance by AirGreen: electrical inspection, refrigeration checks, battery cleaning, safety tests.
These good practices maintain a high COP , reduce consumption and extend the life of the heat pump .
Grants and Eligibility
Depending on the power , seasonal efficiency and heating use, several programs may apply in Quebec. Recent wall-mounted heat pumps with R-32 and good low-temperature efficiency are generally well positioned . We always check eligibility during the estimate and support the customer in the process. This is an essential part of our service in Montreal, Laval, Longueuil, the North Shore and the South Shore .
Best practices to remember for a terrace installation
To do
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Elevate the condenser and ensure sufficient air clearances .
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Provide capping adapted to the color of the facing for a clean finish.
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Optimize line length and curvature radii to maintain efficiency .
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Protect the crossings (vapor barrier, sleeve, mastic).
To avoid
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Placing the condenser against railings or walls : this recycles hot air and degrades performance.
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Undersize the device: short cycles, wear, overconsumption .
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Forget gravity drainage when the configuration allows it: the condensate pump must remain the exception.
Why AirGreen for your HVAC installation in Saint-Léonard and Greater Montreal?
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Certified team (RBQ, CMEQ) and standardized procedures .
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Selection of recent equipment (R-32/R-454B) aligned with best practices in efficiency.
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Clean construction sites : precise drilling, careful finishing , documented tests.
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After-sales service and HVAC maintenance that maintains performance levels over time.
Conclusion
This Gree wall-mounted heat pump installation (R-32 range) in Saint-Léonard illustrates our way of working: analysis , rigorous sizing , optimized refrigeration path , harmonized cappings and anti-vibration support for quiet and energy-efficient operation. The result is measured daily: stable comfort , reduced bills and a neat facade —the winning trio for a well-air-conditioned Montreal home ready for the off-season.