Four-season comfort and careful finishing: an HVAC installation that respects the interior architecture
Customer context and performance objectives
In this Rosemont–La Petite-Patrie home, our client wanted a discreet heating and cooling solution that was efficient in Montreal's extreme cold and capable of improving air quality. After a thermal assessment of the living areas and the route constraints, we recommended a Sharp ZU1 wall-mounted heat pump (R-32 refrigerant) , known for its stable performance in low temperatures and its heating mode, which is particularly useful in the off-season.
Why the Sharp ZU1 for a Montreal apartment/plex
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Optimized seasonal efficiency and lower GWP R-32 refrigerant, in line with new environmental requirements.
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Low temperature heating function suitable for winters in Montreal, Laval, Longueuil, North Shore and South Shore .
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Sharp's proprietary Plasmacluster ionization technology contributes to healthier indoor air when cooking, entertaining, or living with the windows closed.
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Quiet operation and regular blowing: ideal for an open living area, a master bedroom or an office.
Location analysis and aesthetic integration
The indoor unit is positioned high on the wall, under a decorative molding. This choice meets three requirements:
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Stratification and diffusion : at height, the blowing covers the room evenly without direct air currents on the occupants.
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Clear air return : the free space around the facade preserves air return and limits filter clogging.
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Visual integration : the lacquered white and the clean lines of the wall-mounted heat pump respect the existing decor (shelf, wall clock), for a discreet presence.
We maintain top and side clearances that comply with the manufacturer's guidelines. The chosen height facilitates periodic filter maintenance and condensate tray inspection.
Refrigeration path and condensate management
The route was designed to reduce lengths and protect interior finishes:
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Clean drilling , sheathed with a bulkhead to prevent any transfer of moisture.
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Insulated refrigeration lines (cold return) and power/communication cable run behind the wall: no visible trunking in the room.
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Gravity condensate drainage with continuous slope towards the outside: no lifting pump, therefore less noise and less maintenance.
Outside, the connections are protected by UV- and frost-resistant capping . The condenser (not visible here) is installed on supports suitable for winter snow removal, with clearances for airflow and vapor barriers at the penetrations for sealing.
Key steps in an AirGreen HVAC installation
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Sizing : calculation of loads per room and validation of orientation/volume; recommendation of a typical residential size (12–18 kBTU depending on the area served).
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Preparation : protection of surfaces, location of networks, dedicated 240 V power point if required, circuit breaker compliant with the Quebec Electrical Code .
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Drilling and sealing : controlled leak angle for flow; fire-resistant foam and exterior sealing .
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Brazing under nitrogen (if adjustments), pressure test with dry nitrogen, then deep vacuum ≤ 500 microns to ensure watertightness.
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Commissioning : opening of charge, reading of R-32 refrigerant parameters , testing in cooling and heating modes at different fan speeds.
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Comfort calibration : orientation of shutters, position memorization, programming of eco scenarios for the night.
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Customer training : filter cleaning, maintenance guidelines, good winter practices (clearing the outdoor unit, defrost cycles).
Result: comfort, silence and savings
From the moment it's turned on, the ZU1 delivers gentle airflow , stable temperatures , and low noise levels —three key features in a dense urban neighborhood like Rosemont. In heating and cooling modes, energy consumption is optimized thanks to the inverter and fine-tuning. Easily accessible filters encourage regular HVAC maintenance , ensuring efficiency and longevity.
Best practices that we systematically apply
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Frost and snow management : clearance of the outdoor unit (> 30 cm from the ground and clear rear) to preserve heat exchange.
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Mechanical protection : stainless steel screws, insulated clamps, butyl tape at the junctions.
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Anti-vibration : pads on supports and torque control of the fixings to limit any transmission to the frame.
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Intelligent control : time scenarios, setpoint locking to standardize comfort without overconsumption.
Recommended preventive maintenance
To maintain performance and air quality:
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Clean filters every 4 to 8 weeks depending on usage.
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Disinfection of the evaporator and cleaning of the fan (avoids odors and reduced flow).
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Checking the drain during the hot season.
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Annual inspection by an AirGreen technician: overheating/subcooling check, electrical connections, electronic board, sensors and fans.
Eligibility for programs and grants
New-generation R-32 wall-mounted heat pumps generally meet the performance criteria required by current programs in Quebec. Depending on the capacity/efficiency combination and the scales in place, assistance may be available to residents of Montreal, Laval, Longueuil, the North Shore, and the South Shore . During each project, we verify eligibility and guide our clients through the process.
What a well-thought-out installation changes in a Montreal plex
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Four-season comfort without invading the space or the interior facade.
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Noise reduction for peaceful cohabitation between neighbors.
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Real estate value increased by a recent HVAC solution, using R-32 , in line with local market expectations.
AirGreen: local expertise, careful finishing and sustainable commitment
At AirGreen , we work weekly in Greater Montreal to install, maintain, and optimize wall-mounted heat pumps like the Sharp ZU1 . Our approach: an accurate diagnosis , a clean installation , rigorous commissioning checks , and long-term support . Are you planning to upgrade your air conditioning and heating systems ? Our team offers you a clear plan, controlled deadlines, and concrete advice to protect your investment.
In brief - highlights of this project
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Equipment type : Sharp ZU1 wall-mounted heat pump , R-32 refrigerant.
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Integration : high indoor unit, clear air return, invisible path inside.
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Condensates : gravity flow , reliability and silence.
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Procedure : nitrogen pressure, deep vacuum , electrical checks, comfort settings.
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Benefits : stable winter/summer comfort, improved air quality, optimized consumption .
Buying advice for Montreal, Laval, Longueuil, North Shore, South Shore
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Demand a load study : the size (kBTU) is chosen based on volume, insulation and use; overcapacity is detrimental to defrosting and humidity.
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Check the heating temperature range and efficiency ; favor recent R-32 series.
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Anticipate the location of the condenser : snow, drainage, neighborhood, maintenance.
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Schedule annual HVAC maintenance : it reduces costs and prevents performance losses.
And after?
We remain available for maintenance , deep cleaning and seasonal adjustments . For multi-room projects, we also offer MultiZone solutions and air quality accessories (exchanger, advanced filtration) compatible with your configuration.
AirGreen – HVAC Montreal
Installation and maintenance of wall-mounted heat pumps for Montreal, Laval, Longueuil, North Shore, South Shore . A local team, impeccable finishes, and lasting comfort.