An indoor head placed in a corridor to supply several rooms with a balanced and quiet airflow
The context: a Montreal apartment, adjacent rooms to serve
In a plex in Villeray–Saint-Michel–Parc-Extension , we were commissioned to install a wall-mounted heat pump capable of providing heating and cooling throughout the year, with a strong priority on the distribution of air to three rooms opening onto a central corridor . This type of configuration is common in Montreal: bedrooms on either side, bathroom, sometimes an office, and a narrow passageway where traffic crosses. Well installed, the interior head transforms this corridor into a soft plenum , distributing tempered air that flows towards each door.
We selected a recent Gree ( R-32 residential range, AHRI reference validated in the quote), appreciated for its inverter modulation, its acoustic discretion and the availability of parts. The objective: four-season comfort with controlled consumption , without compromising on aesthetics or maintenance.
Choice of location: the logic of the corridor
Placing your head at the end of the corridor , in the upper part, allows:
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to obtain a natural Venturi effect towards the rooms when the doors are ajar;
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to destratify the air in winter (the air blows from the top and falls calmly into the rooms);
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to limit the noise impact perceived in the rooms, the source being far from the rest areas;
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to preserve the side walls for furniture and switches.
We centered the unit under the ceiling light fixture, with a clearance above it to ensure the air intake doesn't stick to the ceiling. The level is set to the millimeter: essential for reliable gravity drainage and to avoid any unwanted noise.
Execution details
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Plate fixed on rigid support, dowels suitable for plasterboard on frame/wood or masonry according to survey.
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Single outward drilling , with a slight downward slope , sleeve + fire-resistant foam + mastic to ensure air/vapor sealing .
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Estimated length of connections : 2 to 3 m to the outdoor condenser, with accessible service loop .
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Condensates : gravity drain with continuous slope; no pump required.
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Communication and power cabling marked, bending radii respected, protected passage in duct outside.
Air diffusion and adjustments: cover three doors without drafts
The corridor is a narrow space. The key is to avoid excessive speed in the passageway while ensuring the reach to the rooms. We configure:
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Modulated horizontal sweep : reduced amplitude to avoid hitting the door frames;
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Open vertical angle for cooling in order to project under the ceiling then let the tempered air fall back into the rooms;
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Auto priority speed , which the electronic card adjusts according to the load;
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Dry mode recommended on heavy days to control humidity without overcooling.
Result: a muffled breeze in the heart of the home, uniform temperatures and comfortable circulation, even with the doors half-open.
Why Gree in this configuration?
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Fine modulation to follow the rapid load variations of a Montreal apartment.
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Reliable electronics and precise sensors that stabilize the setpoint.
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Simplified HVAC maintenance : clear access to filters and fan, consumables available.
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R-32 ranges optimized for better seasonal efficiencies and reduced refrigerant charge.
(Since the model marking is not exposed once the unit is closed, we always validate the exact part number, low temperature range , and AHRI matching when quoting and ordering.)
Coordination with the exterior: cleanliness and climate resistance
On the facade side, the condenser is installed with standard clearances for air intake and exhaust. UV ducts protect the connections, the elbows are closed, and the electrical disconnect is located within service range. In winter, defrosting requires free space under the unit: we anticipate this to avoid ice buildup. The assembly visually integrates into the architecture, while remaining accessible for maintenance.
Sizing: avoid under- and over-power
We size the power (BTU) of a heat pump installed in a corridor by considering:
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Surface areas and volumes of adjacent rooms, ceiling height, number of doors.
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Building envelope : brick walls, insulation, windows, air infiltration.
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Sun exposure and internal gains (appliances, occupation).
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Use : doors generally open during the day, partially closed at night.
This method ensures a machine that modulates most of the time, avoiding short cycles and discomfort.
AirGreen commissioning: control protocol
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Deep vacuum (micron-gage) and hold to confirm the tightness of the connections.
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Opening valves , testing blowing temperatures , checking superheat/subcooling differences according to conditions.
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Setting of modes, instructions, scans , restart after power cut.
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Instructions for use : let the machine modulate, avoid frequent setpoint variations, keep the doors ajar for natural distribution .
HVAC Maintenance: The Routine That Extends Performance
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Filters : cleaning every 4 to 8 weeks in season;
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Indoor exchanger : gentle dust removal, device off;
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Outdoor condenser : rinse with water in spring/fall;
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Annual inspection : electrical tightening, line insulation , condensates, fans, sensors;
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Winter : clear the space under the outdoor unit to allow defrost water to drain away.
Common pitfalls in corridor installation — and our solutions
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Head too high, stuck to the ceiling → air recirculation: we keep the required upper clearance .
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Direct blowing towards a door → local discomfort: orientation of the shutter and sweep amplitude adjusted.
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Drain without slope → droplets: level control, water test before delivery to the customer.
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Leaky drilling → infiltration and noise: sleeve + professional sealant + systematic fire-resistant foam .
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Connections too tight → fluid noise: service loop and clamps at the correct center distances.
Grants and Eligibility
Several programs in Quebec encourage heat pump projects when the performance and low temperature range are certified ( AHRI file). Eligibility varies depending on the reference and the territory ( Montreal , Laval , Longueuil , North Shore , South Shore ). We support households in verifying the criteria , collecting evidence and submitting the file.
Measurable results for the client
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Consistent comfort in the rooms and hallway;
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Noise contained thanks to modulation and rigid installation;
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Summer humidity better controlled with a suitable mode;
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Significant energy savings compared to electric heaters and window air conditioners.
Our coverage and our method
At AirGreen , we operate throughout Greater Montreal : Montreal , Laval , Longueuil , North Shore , South Shore . Each HVAC installation is preceded by a field diagnosis : connection routes, condensate flow strategy, architectural constraints, condenser location, electrical panel. A clear quote and a precise schedule accompany our recommendations.
Conclusion
This Gree installation in a corridor in Villeray–Saint-Michel–Parc-Extension illustrates an approach designed for Montreal housing: strategic location , careful finishing, air parameters calibrated room by room and rigorous commissioning . The result is stable comfort , optimized consumption and discreet integration into everyday life.