Optimize comfort without affecting the exterior appearance: our AirGreen team sets up a neat interior HVAC installation , with discreet routing of the connections in the upper part of the wall for a new generation GREE R-32 wall-mounted heat pump .
An intervention in the heart of a Rosemont plex
In Rosemont–La Petite-Patrie , most of the housing is a plex with thick load-bearing walls and regulated facades. Here, we're installing a wall-mounted header in a living room whose high moldings and wooden shelf deserve to be preserved. The client wants reliable heating during the off-season and a quiet wall-mounted air conditioner in the summer, with no visible hood on the facade overlooking the alley.
Objectives set with the owner
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Improve the comfort of an open area without invasive work.
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Protect the interior aesthetics (moldings, paint) and exterior (no capping on the main facade).
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Ensure simple maintenance and accessible connection passage.
Why a GREE R-32 wall-mounted heat pump for Rosemont?
Heating efficiency and stability
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Inverter technology ensuring fine modulation: fewer temperature variations and optimized consumption .
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R-32 refrigerant, more efficient than R-410A, allowing reduced loads and better seasonal performance.
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Comfort guaranteed during the moderate cold weather common in urban Montreal.
Quiet and easy to live with
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Contained sound levels of the interior head, essential in an urban density like Montreal .
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Simple remote control and useful functions (auto restart after power off, night mode, scanning).
Sustainability and availability
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Parts and service available in Greater Montreal (Montreal, Laval, Longueuil, North Shore , South Shore ), guaranteeing peace of mind for HVAC maintenance .
Model note: the visual corresponds to recent GREE R-32 heads (Livo/Vireo/Clivia type). We select the capacity (9k to 18k BTU most often) after calculating the load according to the envelope and the area served.
Installation architecture: clean and reversible interior routing
Upper part of the route, protected and aligned with the moldings
We run the refrigeration lines, communication cable and drain horizontally, in the upper part of the wall, above the head . The connections are sheathed with a continuous gray insulation , held in place by black fasteners at regular intervals. This choice offers several advantages:
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Preservation of finishes : no bleeding; fixings are limited to the plane of the painted wall.
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Accessibility : subsequent checks (condition of insulation, tightening) are carried out without major disassembly.
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Controlled drain slope : the gravity pipe follows the high line with a gentle slope towards the right side outlet.
At the end, a vertical elbow descends towards the discreet drilling , allowing the exit to the outside (alley) and the connection to the condenser. The whole remains straight and readable , a guarantee of reliable operation.
Drilling and sealing
The single hole is made at head height, with a sleeve , vapor barrier and elastomer seal to prevent air infiltration and protect the insulation of the connections. We respect the minimum bending radius of the copper to preserve the calculated superheating/subcooling.
Length management
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Short to medium total length (≈ 4–6 m) between head and condenser, limiting pressure losses.
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No intermediate connections in invisible areas: the flares are concentrated at the ends to eliminate the risk of micro-leaks behind the wall.
Commissioning: the rigor that changes everything
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Calibrated flares : cutting, internal/external deburring, light lubrication, tightening with a dynamometer according to the diameter.
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Nitrogen leak test and deep vacuum down to < 500 microns, with stabilization.
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Opening of R-32 fluid (factory charge) and compensation if the actual length exceeds the manufacturer's base.
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Functional controls : delta-T in cold/heat, compressor intensity, communication, flap sweep, gravity condensate evacuation.
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Acoustic check and delivery of instructions: cleaning of filters, stable instructions to promote inverter modulation, winter instructions (condenser clearances).
BTU Sizing: AirGreen Method for an Open Area
Sizing is critical. We consider:
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Envelope (insulation, windows, air infiltration).
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Volume actually stirred by the head (geometry, partitions, stairwell).
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Internal/solar contributions (orientation, occupations, devices).
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Target holding point (−20°C to −25°C depending on the range chosen).
This approach avoids short cycles , maintains comfortable humidity levels , and reduces operating costs. The capacity chosen is generally between 9,000 and 12,000 BTUs for a typical living room, but each home is checked on a case-by-case basis.
Daily comfort: what the owner gains
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Even diffusion : the high wall head circulates the open area without drafts.
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Quiet : the fan remains at low speed most of the time thanks to the inverter.
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Preserved aesthetics : the high, linear routing respects the paint and moldings; the straight wall outlet avoids visible capping on the main facade.
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Simplified HVAC maintenance : accessible washable filters, visually inspectable connections, external disconnect available on the alley side.
Good practices and pitfalls to avoid (field feedback in Montreal)
To do
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Ensure the slope of the drain over the entire horizontal portion; test with clean water before closing.
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Maintain sufficient bend radius at elbows to protect the copper.
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Provide fasteners every 40–60 cm: the insulation remains solid, no unsightly sag.
To avoid
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Drillings too low which complicate the gravity of the condensate (unnecessary pump).
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Serpentine passages multiply losses and friction points .
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“Instinct” tightening: incorrect torque is the number one cause of delayed leaks.
Grants and Eligibility
Depending on the GREE R-32 range chosen and its efficiency certifications, the project may be eligible for assistance in effect in Quebec. We support our clients in Montreal , Laval , Longueuil , North Shore and South Shore to validate the criteria (performance, maintenance temperatures, proof of installation) and optimize the file .
Annual maintenance: maintaining performance
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Filters : Rinse every 4–6 weeks during use.
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Outdoor heat exchanger : clear snow and leaves; gentle rinsing as needed.
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AirGreen Inspection : delta-T measurements, current control, inspection of flares and condenser support, update of usage advice.
Regular HVAC maintenance is the best guarantee of longevity and stable bills.
Result in Rosemont–La Petite-Patrie
The controlled interior installation and discreet high-level path deliver a comfortable, quiet, and easy-to-maintain GREE R-32 wall-mounted heat pump system. The owner benefits from more stable air in both summer and winter, while the plex's façade remains intact—an ideal balance for Montreal's lifestyle.
AirGreen, your HVAC partner in Greater Montreal
We respond quickly in Montreal (Rosemont–La Petite-Patrie, Villeray, Le Plateau, Le Sud-Ouest) , as well as in Laval , Longueuil , North Shore and South Shore . Our commitments: precise sizing , clean HVAC installation , clear grant files and annual monitoring .
Express Fair
Is the drain gravity or with a pump?
We favor gravity ; here the slope is integrated into the upper portion. A pump is only offered as a last resort.
Can the ducts be painted?
Yes, a compatible paint can be applied to the insulation to blend the route into the decor — after validation of adhesion.
What if I want a second zone?
We are studying a Multi-Zone Heat Pump or the addition of a dedicated unit, depending on the volumes and possible routes.