Clean in-wall integration for four-season comfort in a Montreal plex
In the heart of Villeray , AirGreen is carrying out the HVAC installation of a Zephyr wall-mounted heat pump intended to air condition and heat the main living area of a plex dwelling. The occupants' objective is clear: to obtain stable comfort all year round without weighing down the interior aesthetics. To achieve this, we favor an invisible integration of the connections inside the load-bearing wall; only two working windows – carefully cut and then closed – bear witness to the passage of our technicians during the finishing phase.
Context and customer expectations
The home features a popcorn-textured ceiling and a solid wall with no exposed cable ducts. The clients wanted to maintain clean surfaces and benefit from quiet operation , especially at night. We offer a 12,000 BTU Zephyr to cover the living room and adjoining dining room, with the option to expand the solution later to a second room if usage requires it.
Our technical approach: concealing connections without compromising on maintenance
Choosing the position of the inner head
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Optimized height : the head is placed a few centimeters from the ceiling to maximize air stratification and improve the blowing range towards the center of the room.
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Structural anchors : We locate the uprights and secure the support to solid points to avoid any vibration. A laser level check ensures the alignment of the casing and the shutter.
In-wall routing of refrigeration lines and cabling
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Service openings : the two cutouts visible during the work allow:
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the refrigeration connection and the communication/power cable in the upper part;
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the clean descent of the gravity drain and, where appropriate, the addition of a compact condensate pump if the minimum slope is not guaranteed.
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Insulated ducts : the connections are slid into continuous insulating ducts to avoid dew points in the partition. The crossings are ringed (partition passes) to eliminate any risk of parasitic noise .
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Airtightness : we seal each hole with an acrylic or silicone-based fire-resistant sealant , depending on the surface, then we install a local vapor barrier to protect the building envelope.
Condensate management
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Gravity priority : the wall's configuration allows for a regular slope toward a nearby drainage column. We install an odor trap and a valve to block rising air.
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Silent pump option : when the layout requires it (long length, reverse slope), we integrate an encapsulated mini-pump with an inspection tank accessible through a painted hatch, in order to preserve the aesthetics of the wall.
Interior finish
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Closing the hatches : after pressure and vacuum tests, the openings are closed with screwed gypsum boards , fiber joints, coating, sanding and tone-on-tone painting for a finish without visible capping .
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Sealing : a discreet peripheral seal absorbs expansion and prevents air whistling.
Rigorous commissioning: performance and longevity
Tests and vacuum drawing
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Nitrogen pressurization (in stages) to check the tightness of flares and fittings.
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High vacuum up to a stable micron threshold, proof of satisfactory dehydration of the circuit.
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Load adjusted according to the actual length of the lines, in accordance with the technical data sheet.
Functional checks
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Temperature measurements : supply/return at different fan speeds to confirm the expected ΔT .
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Electrical control : compressor intensity, earth continuity, terminal tightening, and dedicated two-pole circuit breaker .
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Acoustics : validation of the sound level at the listening point of the living room; elimination of any whistling noise by micro-adjustment of the fairing and the flap.
Why the Zephyr for a Villeray plex?
Modulation and stability
Inverter technology adapts power to actual needs: longer cycles, consistent temperature, controlled consumption . In a Montreal apartment, this translates into fewer variations and constant comfort .
Seasonal yield
Depending on the capacity selected, the Zephyr series offers high seasonal coefficients and effective heating down to low temperatures. For Villeray, Ahuntsic , Rosemont or Le Sud-Ouest , this is an asset during the off-season and during intense cold weather.
Silence and air quality
The indoor unit features a balanced fan and easy-access filters. Regular maintenance keeps noise levels low and maintains stable air quality in the living area.
Neat aesthetics
By concealing the connections, we maintain a clean interior facade ; this approach enhances the surfaces and respects the decorative choices of the occupants.
Construction site challenges and AirGreen solutions
1) Dense partition and obstacles
Plexiglas from before 1980 contain reinforcements , furring strips, and even old ducts. We explore the cavity with an inspection camera and bypass obstacles with large radius elbows so as not to penalize the refrigerant flow.
2) Popcorn textured ceiling
Installing close to the ceiling requires meticulous protection against dust. We cover the wall, vacuum during cutting, and retexture if necessary for a discreet fit.
3) Reliable drainage
We favor a minimum slope of 2% . When the gravity axis crosses cold areas (crawl space, peripheral wall), we insulate the tube to prevent condensation and avoid any stagnation.
4) Noise and vibrations
Anti-vibration pads under the head and tightening torque in accordance with the flares eliminate rattling. The cable sheath is separated from the bulkhead to prevent resonances.
Result: immediate comfort and simplified maintenance
From the first time it is switched on, the long-range laminar airflow effectively cools the room. In heating mode, the airflow remains warm and continuous , without the sensation of a cold draft. The washable filters can be removed in seconds, access to the condensate tray is easy for annual cleaning, and the front remains perfectly smooth .
Maintenance and recommended best practices
HVAC Maintenance Schedule
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Cleaning the filters : every 4 to 8 weeks during periods of use.
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Annual inspection : cleaning of exchangers, temperature control and tightening of connections.
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Hygiene : gentle treatment of the tank and the exchanger limits biofilms and maintains performance.
Daily use
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Keep interior doors open to allow circulation to adjacent rooms.
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Program stable settings ; avoid significant temperature variations between day and night.
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Head clearance: maintain at least 30 cm laterally for optimal sweeping.
Grants and support
Several Zephyr configurations are eligible – depending on capacity and performance – for current grant programs . We support our clients in Greater Montreal (Montreal, Laval , Longueuil , North Shore , South Shore ) to validate eligibility, gather evidence (photos, AHRI numbers, detailed invoice) and maximize return on investment .
Why choose AirGreen in Villeray and throughout Greater Montreal?
Our team is familiar with the specific constraints of plexes: load-bearing walls , textured ceilings, narrow technical routes, and high aesthetic requirements. We deliver clean , tested and documented installations, with measured commissioning and clear operating advice. The discreet connections and reliable installation are the AirGreen signature.
Summary intervention sheet
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Equipment : Zephyr wall-mounted heat pump , approx. 12,000 BTU .
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Interior layout : top of wall, near ceiling, in-wall route .
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Lines : insulated copper in continuous sheath, controlled connections, fire-resistant sealing .
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Condensates : priority to gravity drain , silent mini-pump option.
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Electrical : dedicated circuit breaker , shielded communication cable, clear marking.
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Commissioning : nitrogen, high vacuum , adjusted load, ΔT measurements, validated acoustics.