Four-season performance, precise air diffusion and discreet integration: an HVAC system designed for a Montreal apartment with narrow corridors, without compromising on comfort or aesthetics.
Project objective
In a home in the Villeray–Saint-Michel–Parc-Extension area, the owners wanted an efficient system to heat and cool the main living area and adjacent bedrooms, while preserving wall space. The solution chosen: a Sharp wall-mounted heat pump (ZU1 series, R-32 refrigerant) , renowned for its stable heating in cold weather and its very fine modulation in the mid-season.
Why the Sharp ZU1 series for this home
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High yields and low temperature stability, suitable for Montreal winters.
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R-32 refrigerant : better volumetric efficiency and lower GWP than R-410A.
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Quiet operation thanks to the inverter compressor and continuous blowing profile.
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Comfort functions : automatic vertical/horizontal scanning, eco mode, frost protection, restart after power cut.
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Multi-stage filtration to improve indoor air quality.
Location analysis and positioning
The accommodation has a narrow corridor distributing the living room and the bedrooms. To reconcile air diffusion and standard clearances, we install the head above the door frame , in the upper part, which offers:
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a direct airflow to the living area,
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an induction effect that draws conditioned air into adjacent rooms as soon as the doors are ajar,
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discreet integration close to the ceiling, without encroaching on the furniture.
Clearances respected : 150 mm minimum lateral, 100 mm underside, and free access to the housing for filter maintenance. Ceiling lighting has been retained without generating shadows on the air intake.
HVAC Installation Details
Refrigeration and finishing
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Careful drilling above the lintel with insulating sleeve to avoid thermal bridges.
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Closed-cell insulated copper connections with UV-shielding tape; controlled bend radius to preserve oil return.
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White interior capping flush with the moldings for a clean, removable finish.
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Brazing under nitrogen flushing , then deep vacuum and nitrogen resistance test before opening the valves.
Power supply and protections
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Dedicated circuit for the panel, circuit breaker sized according to the unit nameplate, FT4 standard cable.
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Communication and power supply between units passed through a sheath to protect the conductors at the crossing.
Condensate management
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Priority to gravity with continuous slope and service siphon.
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When the topology requires lifting (door passage or long reach), install a silent mini-condensate pump with insulated line and non-return, in order to avoid any seepage during the cooling period.
Commissioning and controls
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Leak test (nitrogen), stabilized vacuum and ascent test.
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Control of currents in operation, measurement of superheating and subcooling .
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Automatic scanning settings to prioritize the living room and limit direct airflow onto the passageway.
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Customer explanations on filter cleaning , seasonal planning and eco modes.
Observed results
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Immediate comfort in the living area; uniform temperature from the corridor to the adjacent rooms.
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Very low noise level : the Sharp ZU1 head remains imperceptible in automatic speed on a daily basis.
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Responsiveness in cooling during heat peaks, with contained consumption thanks to Inverter modulation.
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In winter, the unit easily maintains the setpoint without topping up, reducing operating costs .
AirGreen Best Practices for Narrow Aisles
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Height : install at the top to clear the traffic area and improve the range of the air jet.
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Orientation : program a wide sweep to break the “tunnel” effect and diffuse towards the corridor branches.
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Condensates : secure the slope; if a pump is required, choose a model with progressive detection to avoid frequent cycles.
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Acoustics : decouple the support plate with silent blocks and check for the absence of resonance on the lintel.
Key technical data of the project (Villeray–Saint-Michel–Parc-Extension)
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Equipment : Sharp wall-mounted heat pump , ZU1 series (R-32).
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Interior layout : above a door, narrow corridor, standard clearances.
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Route : crossing at lintel height, isolated connections, white capping finishes.
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Condensates : gravity preferred; pump solution ready for future redevelopment.
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Electrical : dedicated circuit, compliant protections, sheathed wiring.
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Service : Easy access to filters without major disassembly; annual maintenance recommended.
Grants and Compliance
The Sharp R-32 heat pump may be eligible for certain energy efficiency support programs when performance and installation conditions are met. We guide homeowners on eligibility and required documentation, whether in Montreal , Laval , Longueuil , the North Shore or the South Shore .
HVAC Maintenance: Our Recommendations
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Vacuum the filters every 4 to 6 weeks during intensive periods.
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Schedule annual maintenance : battery cleaning, current monitoring, probe calibration, condensate line inspection.
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In summer, leave the room doors open for a few minutes after switching on to speed up temperature standardization.
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In winter, use the stable setting (19–21°C) rather than frequent variations which increase consumption.
What we bring to every construction site
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Precise sizing according to the envelope and occupancy habits.
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Clean and reversible installation , with legible paths and accessible components.
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Respect for the roof membrane and facades when crossings are necessary.
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Local after-sales service : rapid interventions and spare parts to limit delays.
And for your home?
Whether you are in Montreal , Laval , Longueuil , the North Shore or the South Shore , the AirGreen team installs the latest generation of wall-mounted heat pumps (R-32/R-454B) while adapting to the real constraints of apartments, plexes and condominiums. We deliver neat, durable and easy-to-maintain projects.