Optimized four-season comfort in a Montreal plex
In a pleasant plex in Saint-Léonard , our team installed a Windair Aura wall-mounted heat pump to ensure consistent comfort in both summer and winter. The apartment features a typical east-end Montreal layout: a kitchen and dining room in a row, a central opening to the hallway, crown moldings on the ceiling, and a large patio door opening onto the rear balcony. This context requires a precise design of the refrigeration path and gravity drainage to preserve aesthetics while maximizing air diffusion.
Client context and objectives
The owner was looking for:
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quiet air conditioning for the kitchen/dining area, without direct air flow onto the table;
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efficient additional heating during the off-seasons to reduce the use of electric baseboards;
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a discreet installation, respecting the decorative moldings and beige tones already present;
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a system compatible with subsidies when the technical data sheet allows it (approved yields, performance in cold weather).
After thermal analysis of the open areas and available airflows, the Windair Aura proved to be an excellent choice due to its compact size, its sober facade and its ability to finely modulate the power.
HVAC System Design
Inner head location
We position the unit above the central opening leading to the corridor. This choice has several advantages:
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Controlled stratification : the treated air sweeps through the dining room, naturally reaches the kitchen and then returns through the corridor, which creates an efficient air loop without dead zones.
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Comfort at the table : the airflow passes over the occupants, avoiding the sensation of direct airflow.
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Easy maintenance : easy access to the washable filter and sensor, without dismantling any joinery elements.
We have maintained careful clearance from ceiling moldings and beam overhangs to ensure free swinging of the shutter and correct reading of the probe.
Refrigerated journey and rollover
The accommodation did not offer an immediate exterior wall at the back of the head. So we have:
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created a discreet opening at the rear right of the unit to join an existing technical column leading to the exterior of the building;
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used a cream-colored, low-protrusion cowling to guide the refrigeration lines (insulated copper), the communication cable and the drain ;
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limited the tubing length to ~15 feet , a standard value included in our installations, ideal for preserving efficiency and oil return pressure.
Each bend was made using a decoiler to avoid wrinkles and ensure insulation continuity. The flared fittings were tightened with a torque meter and then checked with nitrogen (test) before being placed under vacuum.
Condensate management
The geometry of the site allowed for gravity flow : we gave the flexible drain a regular slope to the outlet point, with an anti-odor collar to prevent backflow. This option avoids a lifting pump (noise, maintenance) and reduces the risk in the event of a power failure.
Power supply and protections
The outdoor compressor is powered from the existing panel via a dedicated circuit breaker, in accordance with the manufacturer's specified rating. Our electricians installed:
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a proximity switch (disconnect) outside;
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a shielded cable to the inner head via the control board;
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grounding in accordance with the Quebec Building Code.
Everything is tested with an ohmmeter and a megohmmeter to ensure the dielectric insulation of the conductors.
Commissioning and quality controls
Sealing and vacuum
After assembling the connections:
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Nitrogen pressurization and prolonged pressure retention to detect the slightest drop.
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Deep vacuum (≤ 500 microns) to remove moisture and non-condensables.
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Stabilization then release of the refrigerant from the outdoor unit.
These steps are critical for compressor durability and subcooling/superheat stability.
Air setting and balancing
We regulate:
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the ventilation speed and angle of the motorized shutter to cover the open area without direct blowing;
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Auto/Heating/Cooling modes and set temperature;
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Wi-Fi integration if the chosen model allows it, in order to optimize schedules and eco-temperature.
Final checks
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Blown temperature and ΔT difference under load.
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Electrical absorption and power factor .
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Parasitic noise: damping by silent blocks and control of the support fixing torque.
Results achieved for the client
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Immediate temperature reduction in summer in the dining room and kitchen, with a consistent feeling extending to the corridor.
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Responsive heating in spring and fall, reducing the need for electric baseboard heaters.
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Very low perceived noise : the Windair Aura maintains its reputation for quiet operation at low speeds.
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Aesthetic integration : the white facade and cream cladding blend in with the beige woodwork and walls; no interference with the decorative moldings.
Why the Windair Aura for an open space in Saint-Léonard?
Technical advantages of the range
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Inverter modulation : adjusts power to actual needs, limiting on/off cycles.
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Accessible filters and easy cleaning, ideal for regular maintenance by occupants.
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Optimized defrosts (on heated models) to support performance in cold weather.
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Intuitive remote control and programming options.
Sizing (BTU) and advice
In open areas with active kitchens, the sensible load varies rapidly. We:
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let's consider the internal contributions (oven, hotplates, occupants);
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let's take into account the orientation of the patio door and the glazing;
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let's check the envelope (infiltrations on the balcony, weather stripping).
This sizing prevents over-capacity (discomfort, short cycles) as well as under-capacity (noise, wear, low ΔT).
Grants and Compliance
Depending on the chosen configuration ( SEER/HSPF efficiency and certifications), a wall-mounted heat pump may be eligible for financial assistance programs in Quebec. We support our clients in:
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check the eligibility of the installed model;
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gather supporting documents (AHRI numbers, proof of installation);
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submit applications on time.
HVAC Maintenance: Maintaining Performance
To maintain performance and air quality:
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Rinse filters every 4 to 8 weeks (more often in the kitchen).
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Keep the indoor battery and condensate tray clean to avoid odors and overflows.
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Have annual maintenance carried out by our technicians: pressure/temperature check, electrical inspection, deep cleaning, drain check.
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Outdoors: Clear the condenser unit of snow, leaves and obstacles, maintain sufficient clearance for heat exchange.
Points of attention and mistakes to avoid
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Units too close to the ceiling : impair airflow and temperature measurements. Here, the clearance meets the manufacturer's recommendations despite the presence of moldings.
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Drain without constant slope : risk of backflow; we install retaining collars to guarantee the slope.
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Multiple unnecessary drillings : we concentrate the crossings in a single technical corridor to preserve aesthetics.
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Electrical undersizing : each machine has its own circuit breaker rating; we respect it, with supporting documents for insurance and compliance.
AirGreen: a turnkey installation, from study to commissioning
At AirGreen, we combine field engineering, quality workmanship and after-sales service . For each project in Montreal, Laval, Longueuil, on the North Shore and the South Shore , we:
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carry out a thermal assessment and a clear proposal;
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coordinate electricity and refrigeration to the same standard;
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deliver a documented commissioning and explain the correct settings for use;
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We remain available for HVAC maintenance and seasonal optimization.
The result: a comfortable interior, tangible energy savings and a clean installation that enhances the home.
And after?
If you have a similar open space—dining room, kitchen, and hallway—the Windair Aura or an equivalent capacity alternative can offer an excellent price/performance compromise. We assess your space, confirm grant eligibility , and plan a quick installation that respects your daily life and the finishes of your home.
AirGreen , your HVAC installation partner in Saint-Léonard and throughout Greater Montreal.