Careful installation, designed for Montreal plexes: 4-season comfort, silence and efficiency
At AirGreen , we approach every HVAC installation like a craftsman's work. In a typical Plateau-Mont-Royal plex, we have just commissioned a Gree Vireo wall-mounted heat pump (R-32) to provide efficient supplemental heating in winter and precise air conditioning in summer. The indoor unit is placed at the top of a passageway leading to the rear terrace, an ideal configuration for sweeping the living area without obstructing traffic. A detailed look at our technical choices, key steps and best practices that will make the investment last.
The context: real constraints of a Montreal plex
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Cut-out volumes , corridors and glass doors opening onto the courtyard: need to diffuse air longitudinally.
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Harsh Quebec winters , humid summers: fine modulation is needed to maintain stable comfort.
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Close to neighbors: priority given to silence and discreet aesthetics.
Why the Gree Vireo R32
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Inverter compressor with wide modulation range: the device follows the thermal load exactly and avoids short cycles.
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R-32 fluid : better seasonal efficiency potential and reduced footprint compared to R-410A generations.
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Comfort functions : automatic wiping, smart restart, optimized defrosting in cold weather.
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Suitability for local climate : very good heating performance at the usual negative temperatures in Montreal .
Study and sizing: the right BTU, no more, no less
Calculation method
We size the heat pump based on actual heat losses: surface areas, orientation, windows, infiltration, levels and room usage. This approach allows:
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to avoid oversizing (noise, discomfort due to too short cycles, additional purchase cost),
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to prevent undersizing (uneven rooms, unnecessary use of electrical supplements),
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to optimize the consumption and durability of the system.
Choice of power and interior layout
The wall-mounted head is centered high up, a few centimeters from the molded ceiling, to take advantage of the Coanda effect : the jet runs along the ceiling, travels through the living room, and then falls back down evenly. Placed above the passageway to the rear, it does not block the French window and covers the adjoining kitchen when the shutters swing in wide mode.
Realization: a clean site, details that count
Drilling and passage of connections
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Single hole through the rear wall, with sheath and vapor barrier to ensure watertightness.
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Insulated refrigeration lines (high density insulation), communication conductors and drain grouped in a continuous white capping , guaranteeing mechanical protection and finishing.
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Deliberately short line length (external installation near the terrace) to limit pressure losses and maintain maximum efficiency .
Condensate management
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Gravity drainage with controlled slope: no lifting pump required, therefore increased silence and reliability .
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Discreet exit to the outside, protected from air intakes and passage areas.
Power supply and protections
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Dedicated circuit from the panel, circuit breaker sized according to the device, and external disconnect box within easy reach for maintenance.
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Grounding and torque- controlled tightening to avoid any overheating.
Finishes and acoustics
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Fixing on perfectly level mounting plate for noise-free internal flow.
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Sealing flaps , stainless steel screws and capping angles connected neatly.
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Checking vibrations at minimum and maximum speed; adjusting the legs and shims if necessary for exemplary quietness day and night.
Commissioning: AirGreen method
Critical Steps
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Deep vacuum with digital vacuum gauge and vacuum holding test.
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Fluid opening and superheat/subcooling control in cooling and heating modes.
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Checking the supply/return delta T and adjusting user parameters (setpoints, shutter, auto speed).
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Customer training : filters, useful modes (Dry for mid-season), good winter practices (let the defrost cycles be managed), maintenance reminder.
Results observed
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Even airflow from the living room to the kitchen and hallway.
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Very low noise levels thanks to Quiet mode and the clear fan placement.
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Marked reactivity in heat waves, maintaining a stable delta T without forcing speed.
Grants, Compliance and Guarantees
Assistance programs
Depending on the capacity chosen and seasonal performance, the wall-mounted heat pump may be eligible for programs in effect in Quebec. We assist with the eligibility verification and the preparation of documents: detailed quote, proof of commissioning and photos. Our team follows the requirements for Montreal , Laval , Longueuil , the North Shore and the South Shore .
Standards and guarantees
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Work carried out by certified refrigeration engineers, according to industry standards and manufacturer's guidelines.
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Compliance with clearances , electrical protections and building sealing .
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Manufacturer's warranty on equipment + AirGreen extension options covering parts and labor.
Maintenance: protecting performance over time
What the customer does himself
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Clean the internal filters every 4 to 8 weeks during periods of heavy use.
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Keep the exterior clear (snow, leaves) around the unit.
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Use stable setpoints rather than sudden variations to take advantage of inverter modulation.
What we do for you
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Annual visit : electrical inspection, insulation check, condition of line insulation, cleaning of the exchanger and performance measurement.
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Adjustment of shutters and recommendations for use over the seasons (e.g. orientation to air condition the upper floor via the staircase).
Common Mistakes…and How We Avoid Them
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Head too low above a door: we place the unit as close to the ceiling as possible to maximize reach and clear passage.
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No need for a condensate pump : here, gravity drain with controlled slope, therefore less noise and less maintenance.
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Too long lines and air recirculation: outdoor installation nearby, clearances respected and air flow undisturbed.
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Interrupted capping : continuous protection and clean finishes for a durable and aesthetic installation.
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“Approximate” sizing : systematic load calculation, choice of BTU capacity proportional to the living areas.
Concrete benefits for the occupant
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Consistent comfort in living rooms, corridors and kitchen areas.
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Energy savings linked to inverter modulation and R-32.
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Everyday silence , including in the evening thanks to low noise mode.
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Simplified maintenance and clear maintenance access for rapid interventions.
AirGreen in Greater Montreal
Our team operates throughout the region: Montreal , Laval , Longueuil , North Shore and South Shore . Brick triplexes, recent condos, suburban homes: we adapt the sizing , layout and finish to each building. You get a clean, documented HVAC installation ready to perform, summer and winter.
Want a clear estimate?
We offer a technical visit, a transparent quote, and equipment scenarios aligned with your comfort objectives, your budget, and the reality of your home. The Gree Vireo R32 integrates perfectly with the Plateau's plexes—and we ensure it performs at its best for a long time.
Quick Facts about the Intervention
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Type : wall-mounted heat pump (mini-split).
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Brand / Series : Gree Vireo – R-32 fluid.
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Interior layout : at the top of the passage, longitudinal blowing, maximum ceiling height.
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Route : single drilling, continuous white capping , gravity drain .
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Electrical : dedicated circuit and external disconnection .
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Objectives : 4-season comfort, silence , high seasonal efficiency and careful aesthetics.