Precise Comfort in a Corner Room: Discreet HVAC Integration, Ultra-Short Runs, and Clean Finishes for a Rosemont Apartment
Background and objectives
In an apartment in Rosemont–La Petite-Patrie , we are installing a latest-generation Gree wall-mounted heat pump with R-32 refrigerant . The main room is located on a corner , with a low ceiling typical of renovated condos and plexes. The client's need is clear: reliable heating in winter , quiet air conditioning in summer , and an aesthetic installation, without invasive cable ducts. The indoor unit is positioned high under the ceiling , close to the right corner of the room to maximize diffusion and minimize the distance to the outside.
Why a Gree R-32 wall-mounted heat pump in this context?
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Fine modulation inverter : maintains the setpoint without variations, ideal for a living room used continuously.
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R-32 : Optimized seasonal efficiency and lower global warming potential than R-410A.
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Controlled acoustics : very low noise levels inside and outside — important in co-ownership.
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Capacity range suitable for Montreal apartments (9,000 to 24,000 BTU), with excellent dehumidification performance.
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Well-established parts and service ecosystem: availability of filters, electronic cards and remote controls, for sustainable HVAC maintenance .
Objective achieved: an energy-efficient , compact solution designed for the urban constraints of Montreal.
Interior layout: logic of an ultra-short route
Head positioning
We fix the head as close to the ceiling as possible (minimum clearance respected) and a few centimeters from the corner return . This position:
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frees up walls for furnishings and preserves sight lines;
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creates a sweep of air that runs along the ceiling and falls gently, ensuring even comfort ;
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reduces the length of refrigeration lines, which improves efficiency and reliability.
Passage of connections and drain
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Single hole in right side wall directly behind unit: estimated run 1.0-1.5m from head to exterior.
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Insulated copper assembly + communication cable + sheathed power supply , protected by a steam break and an elastomer sealant .
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Gravity drain to the outside with continuous slope; flow test carried out at commissioning.
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Clean interior finish: retouching of joints and smoothing of the top of the wall (visible in the photo after plastering) for a neat aesthetic.
Height and maintenance
The clearance under the casing ensures access to the filter and the flap. The covers can be removed without contact with the ceiling, avoiding any marks on the new paint.
Outdoor interface (condenser): performance and durability in cold climates
Although the condenser does not appear in the photo, its design and location are a result of the short route chosen:
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Galvanized steel wall bracket , fixed to the supporting elements, in order to raise the device above the snow level.
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Compliant clearances for recovery and blowing; particular attention to the evacuation of defrost condensates to avoid ice on the ground.
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Proximity switch and dedicated power supply, sized according to the chosen capacity (208/230 V).
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Anti-vibration and blowing direction to limit noise pollution towards neighbors.
Key steps in our HVAC installation
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Area protection (tarpaulins, tape, corners) and stud/upright marking.
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Template tracing , drilling sloping outwards (≈ 65 mm) with waterproof sleeve.
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Flaring to torque, nitrogen during brazing if required and pressure test .
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Deep vacuum measurement (≈ 500 microns or better) and rise control.
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Electrical connections according to Gree diagrams (polarity/earth).
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Commissioning : heating/cooling test, drain check, airflow configuration and explanation to the customer.
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Finishing touches : interior/exterior sealing, plaster/paint touch-ups on the top strip, cleaning.
Sizing: Choosing the Right Capacity
For a corner room in Rosemont with recent insulation:
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9,000 to 12,000 BTUs are suitable for a room ≤ 450 sq ft with moderate solar gain.
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15,000 to 18,000 BTU when the head serves an open area (living room-kitchen-hall) or large glass surfaces.
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24,000 BTU if the device covers several rooms or higher losses (garden level, multiple exterior walls).
We always carry out a thermal load check : exposure, infiltration, sealing, floors above/below, occupancy habits.
Use and comfort : our recommended settings
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Stabilize the setpoint (avoid variations > 2°C).
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Flap orientation : slight angle to break up stratifications and avoid direct blasts.
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Dehumidification mode during humid periods for superior perceived comfort .
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Quiet/Night function in condominiums, particularly useful between 10 p.m. and 7 a.m.
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Allow the defrost cycle to complete in winter; do not turn off the appliance at the circuit breaker.
HVAC Maintenance: Maintaining Performance
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Filters : rinse every 4 to 8 weeks during periods of intensive use.
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Indoor heat exchanger : annual gentle cleaning to maintain seasonal performance and air quality.
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Drain : spring check to avoid any obstruction when restarting in summer.
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Condenser : clear snow and inspect the silent blocks ; gently brush the fins if necessary.
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AirGreen preventive visit : electrical check, sensors, static pressure, blowing temperature and fan speed settings.
Specific points of attention for a corner installation
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Air intake : positioning close to the corner requires a horizontal shutter adjustment to effectively sweep the room.
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Resonances : anchors at the correct torque to avoid any vibration on light partitions; use of rubber buffers between console and wall.
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Thermal bridges : tight sealing of the drilling and continuous insulation on the connections up to the exterior passage to prevent condensation.
Finishes and aesthetics
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Millimeter alignment with the ceiling joint.
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Plaster/paint touch-ups on the upper crown to obtain a uniform band.
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Invisible route (no visible trunking inside) thanks to the direct passage behind the unit: this is one of the advantages of corner mounting facing an exterior wall.
Energy efficiency and financial aid
The Gree R-32 wall-mounted range achieves high levels of heating and cooling efficiency, generally compatible with current efficiency programs depending on capacity and configuration. We support our customers in Montreal, Laval, Longueuil, North Shore and South Shore to verify eligibility , gather proof of installation and optimize the file.
Key technical details of this installation in Rosemont
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Very short refrigeration path : ≈ 1.0–1.5 m from the interior wall to the exterior, limiting pressure losses.
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Gravity drain with controlled slope and flow test.
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Single piercing with air break and sealant; continuous insulation of connections.
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Ceiling height optimized for maintenance; clear housing for access to filters.
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Finish : upper band reworked with plaster for clean visual integration.
What we guarantee
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Clean and documented work , compliant with HVAC standards.
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Real heating performance in Montreal, even during cold periods.
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After-sales service : maintenance, seasonal advice, parts available.
Who is this setup for?
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Condos and plexes with immediately accessible exterior wall.
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Corner rooms where minimal space and discreet integration are sought.
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Renovation projects where you want to limit visible cable ducts and preserve aesthetics.
Conclusion
The installation of this Gree wall-mounted heat pump (R-32) in Rosemont–La Petite-Patrie illustrates our approach: precise sizing , short path , clean finishes and comfort- oriented settings. The result is an energy-efficient system that integrates naturally, while guaranteeing savings and indoor air quality that meets the expectations of condominiums in Greater Montreal . For your projects in Montreal, Laval, Longueuil, on the North Shore and the South Shore , our AirGreen team takes care of everything: consulting, HVAC installation, HVAC maintenance .