An interior installation to the millimeter in a central corridor to spread comfort everywhere
Client context, building and objectives
In a bright apartment in Villeray–Saint-Michel–Parc-Extension , our client wants to modernize their HVAC comfort without major work, while maintaining a clean aesthetic. The apartment is organized around a central corridor distributing the bedrooms and the living area. We offer a Zephyr wall-mounted heat pump ( R-32 refrigerant, inverter compressor) to efficiently cover the main space and adjacent rooms, with discreet operation all year round.
The location chosen for the interior headboard – above a storage door, at the head of the corridor – is no accident: it allows for optimal airflow towards the living area and a gentle fall towards the bedrooms, while freeing up the strategic walls of the living room.
Why Zephyr for a Montreal apartment?
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High seasonal efficiency thanks to the inverter and R-32 (better performance and reduced climate impact compared to R-410A generations).
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Useful heating in winter : the heat pump maintains stable capacities at low temperatures, a key asset for Montreal , Laval , Longueuil , North Shore and South Shore .
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Quiet indoors and outdoors, ideal for a dense urban environment.
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Easy maintenance : washable filters and easy maintenance access.
Sizing, orientation and rules of the art
Load study and BTU selection
Before any installation, we carry out a thermal load calculation based on:
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the open area on the corridor,
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the orientation of the windows,
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wall insulation and ceiling height,
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air infiltration (seals, door surrounds).
The goal is to avoid both oversizing (short cycles, discomfort) and undersizing (lack of power during heat peaks). We select a BTU rating that matches the envelope and the air distribution from the corridor.
Inner head position
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Height : high installation to promote stratification and allow the shutter to push tempered air along the corridor.
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Clearances : respect the upper and lateral setbacks for good sweeping and service access.
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Orientation : adjustment of the horizontal shutter in long blowing mode towards the living area; vertical angle adjusted to avoid direct flow onto the occupants.
Route of connections and drilling
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Unique discreet piercing behind the head, airtight and vaportight.
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Refrigeration lines and communication cable routed with a white cover aligned with the baseboards/wall corners for clean integration.
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Gravity slope of the condensate drain to the outside, eliminating the need for an internal pump in this configuration.
AirGreen HVAC Installation Steps
1) Preparation and protection
We protect the floors and frames, then install the mounting template . The metal head support is plumbed and anchored in a load-bearing area.
2) Drilling and hooding
The drilling is carried out to the exact diameter of the connections; we install a sleeve and collars to avoid any friction. The interior casing follows the lines of the wall, ensuring a clean and durable finish.
3) Soldering and connections
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Dynamometer calibrated flares .
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Brazing under nitrogen to protect the internal face of the tubes.
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Polarized wiring according to the Zephyr diagram; continuity testing and grounding .
4) Vacuum and leak testing
A deep vacuum is drawn down to a threshold below 500 microns, stabilized, then released to check for any rise. We then validate the R-32 charge according to the actual line length.
5) Commissioning and balancing
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Measurement of blown/return temperature differences ,
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Control of intensities and instantaneous output ,
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Adjustment of ventilation levels and silent mode for the night,
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Programming of instructions and time slots according to occupancy.
What corridor layout reveals: airflow and comfort
Cross-diffusion
Placed above the door, the head feeds the corridor which acts as a natural plenum . The tempered air slides, is distributed towards:
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the open living room (priority in summer),
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adjoining rooms when the doors remain ajar,
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the adjacent kitchen , reducing heat peaks after cooking.
Directions for use
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Leave doors ajar during warm periods to benefit from circulation.
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Avoid forcing a setpoint too low; a stable setpoint improves efficiency .
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Use the dehumidification mode on humid days to increase perceived comfort without lowering the temperature excessively.
Finishes and details that make the difference
Aesthetic integration
The flush white cover and the alignment of the head to the upper edge of the door provide a clean visual line. The screws are hidden , and the junction points receive a clean acrylic seal for a continuous finish.
Silent operation
We validate the noise level at low speeds on site. The vibration is absorbed by the wall plate inserts and the stability of the load-bearing wall. The result: a barely perceptible hum in the hallway and no disturbance in the bedrooms.
Accessibility maintenance
Access to the filter is from the front; the high position prevents everyday shocks. The connections are grouped and identified, facilitating any subsequent intervention.
Security, Compliance and Documentation
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Dedicated electrical circuit from the panel, circuit breaker rating according to the device plate.
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External proximity circuit breaker (condenser side) for service operations.
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Labeling of lines and provision of an installation file (serial numbers, lengths, settings).
Grants and administrative support
Wall-mounted heat pumps that use newer refrigerants and offer good performance are generally eligible for efficiency programs . At AirGreen, we help households in Montreal , Laval , Longueuil , the North Shore and the South Shore to:
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check eligibility according to the installed model and cold weather performance,
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gather evidence (photos, serial numbers, detailed invoice),
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submit requests and track progress.
HVAC Maintenance: The Winning Routine
Every 1 to 2 months (heavy use in summer)
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Open the hood and rinse the filters with warm water; dry thoroughly before replacing.
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Dust the blower ramp and the sensor.
In spring and autumn
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Visual inspection of the interior hood connection and drain.
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Quick test of modes (cold/heat) to anticipate the season.
Annually
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Professional maintenance : cleaning of coils (inside/outside), leak testing, electrical measurements and parameter updates. This visit preserves performance and extends lifespan.
Common mistakes avoided on this site
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Head too low above a door: reduction of the blowing cone. Here, the height respects the required setbacks.
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Drain without slope : risk of drips and odors. Ours follows a continuous slope to the outlet point.
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Multiple openings : leaks and thermal bridges. We work with a single sealed and insulated opening .
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Connections too long : performance drop. The route has been optimized to remain short and direct.
Result: consistent comfort, reduced bill, preserved interior
The Zephyr wall-mounted heat pump ensures rapid cooling of the living area, thermal stability in the bedrooms and controlled energy expenditure. Integration into the central corridor combines efficient diffusion , discretion and simplified maintenance . The customer gains four-season comfort without sacrificing aesthetics.
Why entrust your project to AirGreen?
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Montreal housing specialists : plexes, condos and townhouses, with particular attention to the constraints of narrow corridors and discreet crossings.
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Instrumented execution : documented vacuuming, measurements and commissioning .
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Neat finishes and local HVAC maintenance service.
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Support with grants and procedures.
Summary sheet – Villeray Project
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Type : single-zone wall-mounted heat pump .
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Brand : Zephyr ( inverter technology, R-32 refrigerant).
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Interior layout : above a door, central corridor ; flow direction towards the living area.
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Route : single drilling, aligned white cover ; gravity drain .
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Objectives achieved : uniform diffusion, silence, controlled consumption, refined aesthetics.
Need a neat installation in a hallway like this?
At AirGreen , we design HVAC systems that respect the architecture of your home and maximize the actual performance of your heat pump . Contact us for a free estimate in Montreal , Laval , Longueuil , North Shore or South Shore . We size, install and maintain high-performance systems, with transparent monitoring from the construction site to the first season of use.