A precise HVAC installation in a tight space, designed for four-season comfort in Montreal
Client context and objectives
At AirGreen , we were approached by a couple living in a typical Rosemont–La Petite-Patrie duplex. Their priority: stable comfort in summer and winter , controlled consumption and minimal noise levels for a living room open to the kitchen. The layout of the home presents a challenge: the only truly clear area is located above an interior passageway , with a prominent molding and little lateral clearance on the left side . We propose the installation of a Zephyr wall-mounted heat pump — a reliable, compact solution perfectly suited to living spaces in Montreal's urban environment.
Why a Zephyr wall-mounted heat pump for Rosemont?
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4-season versatility : efficient heating at the beginning and end of Montreal winters, responsive air conditioning during heat waves.
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Silence : acoustic relaxation in an open living space.
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Compact format : ideal when walls are constrained by frames and cornices.
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Simple maintenance : accessible filters, quick cleaning, increased longevity with an annual HVAC maintenance program.
What we are doing on this site
Survey, layout and choice of location
We start with a precise survey of the obstacles (moldings, lintels, uprights). The installation template is adjusted to position the head above the passage , while guaranteeing:
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free airflow towards the living room,
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sufficient clearance for the upper air intake,
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a controlled distance for refrigeration connections.
Unique feature of the site : the reduced clearance on the left side . We use an offset plate and check the level to avoid any retention of condensate in the tray.
Drilling and routing of connections
The main drilling is carried out with a gravitational inclination towards the outside to naturally evacuate the condensates. The insulated copper pipes and the communication cable follow a short route (≈ 2 to 3 m) towards the outdoor unit, which limits pressure losses and optimizes efficiency. The passage is perfectly sealed (fire-resistant foam / sealant) to eliminate air and moisture infiltration.
Please note : In Montreal plexes and duplexes, openings near frames must avoid studs and respect the interior aesthetics . Our team always ensures a clean finish around the exit.
Bending, flaring and refrigeration sealing
The connections are bent with a large radius to preserve the integrity of the copper. The flares are made with a calibrated flare and torque values adapted to the nuts of the Zephyr fittings. We apply compatible POE oil to the threads and then tighten with a dynamometer to ensure long-term resistance.
Nitrogen pressurization and vacuum extraction
Before any commissioning, we:
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We pressurize with nitrogen (control stage) to track down any micro-leaks.
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We carry out a deep vacuum draw down to ≤ 500 microns , stabilized, in order to evacuate residual humidity.
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Let's check the vacuum is holding and then release the refrigerant from the outdoor unit.
This methodology ensures long-lasting sealing and consistent performance .
Electrical connection and protections
The heat pump is powered by a dedicated circuit that complies with current standards, with a circuit breaker appropriate for the panel. An external disconnect box facilitates subsequent work. We check the polarity of the communication cable (terminal block 1-2-3/1-2-3) to avoid any synchronization errors.
Condensate management
The internal tank is configured with a gravity slope via the drilling. We validate the freedom of flow and test the evacuation in cooling mode . In urban environments like Rosemont, we always favor gravity to reduce maintenance and noise; a condensate pump is only retained if the architecture requires it.
Commissioning and configuration
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Functional test in air conditioning then heating mode .
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Checking the blowing , fins , sensors and communication between units.
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Activation of eco and night modes according to occupant usage.
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Detailed explanations of remote control and HVAC maintenance routines.
Result: measurable comfort and discreet finish
Uniform thermal comfort
Placed high above the passageway , the Zephyr head circulates the air efficiently without direct air currents on the occupants. The laminar blowing covers the entire living room-kitchen. In heating mode, the high return allows the warm air to be destratified for comfort that is noticeable from the first minutes.
Acoustics and aesthetics
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Low noise level inside and outside.
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Discreet integration : alignment with the molding, invisible fixings, clean finish at the right of the drilling.
Energy efficiency in everyday life
Inverter modulation continuously adapts power to the thermal load. Customers note:
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a reduction in consumption compared to an electric auxiliary heater,
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temperature stability without over-oscillation,
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drier air in summer, conducive to comfort.
Use and maintenance tips by AirGreen
Best practices for maximizing lifespan
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Filters : Vacuum/clean every 4 to 8 weeks during periods of heavy use.
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Clearance : leave at least 1 m free in front of the facade for optimal mixing.
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Instructions : In summer, aim for 23–24°C to limit overconsumption; in winter, 20–21°C is sufficient in a well-insulated home.
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AUTO mode : practical for everyday use; use DRY mode on very humid days.
Annual HVAC maintenance
Our HVAC maintenance visits include:
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thorough cleaning of the exchanger (elimination of biofilms),
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checking electrical connections ,
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checking pressures/operating parameters ,
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inspection of condensate drainage and defrosting .
Regular maintenance protects equipment and ensures continued seasonal performance .
What you need to know about grants and compliance
Depending on the chosen configuration and the seasonal performance of the Zephyr wall-mounted heat pump, the installation may be eligible for certain assistance programs in Quebec. We assist our clients in verifying eligibility (documents, proof of performance, electrical compliance). Our team also manages the RBQ declaration , the refrigeration certificate and warranties.
What this setup taught us (and what it saved you)
Challenges encountered
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Limited lateral clearance : solved by an offset plate and precise installation to maintain access to the filters and the hatch.
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Molding above the passage : respected thanks to a precise survey and careful drilling with gravity slope.
Common Mistakes Avoided
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Drillings without slope → water retention and odors: avoided.
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Flare fittings tightened “by feel” → micro-leaks: avoided thanks to the dynamometer .
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1-2-3 wiring reversed → communication fault: systematic cross-check .
Why AirGreen for your project in Montreal, Laval, Longueuil, North Shore and South Shore?
Our added value is based on three pillars:
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Location diagnosis suitable for plexes and condos in Greater Montreal.
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Rigorous refrigeration procedures (nitrogen, deep vacuum, tightening torques).
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Finishing and service : careful aesthetics, occupant training, maintenance monitoring .
Whether you are in Montreal , Laval , Longueuil , on the North Shore or the South Shore , we size and install your heat pump with the same attention to detail.
Quick FAQs
Does the Zephyr heat well in Montreal winters?
Yes, inverter technology maintains good heating capacity during moderate cold weather. For periods of extreme cold , we size and configure the device for intelligent backup if necessary.
Is the interview complicated?
No. Accessible filters , simple periodic cleaning, and annual inspection recommended by us.
Can more rooms be added later?
For other areas, we offer additional solutions (second head, or other suitable equipment). We check the total power and available electricity before any addition.
Conclusion
This Zephyr wall-mounted heat pump installation in Rosemont–La Petite-Patrie exemplifies our approach: precise spatial analysis , methodical execution , and impeccable finishes . The result: four-season comfort , discreet integration , and lasting performance . At AirGreen, we transform Montreal housing constraints into elegant and efficient HVAC solutions .
Internal keywords : heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Rosemont–La Petite-Patrie , Zephyr .