Installation of a TOSOT-GREE wall-mounted heat pump in Rosemont–La Petite-Patrie
Consistent comfort and discreet aesthetics: interior installation high above a door, invisible connections and precise calibration for a Montreal apartment
A demanding interior installation, carried out properly
In this Rosemont–La Petite-Patrie (Montreal) apartment, our team installed a Gree wall-mounted heat pump to provide four-season heating and cooling , with performance adapted to the local climate. The interior head is located above a circulation door , in a hallway that serves the kitchen and living room. This choice requires millimeter precision: respecting clearances, preserving the door's maneuverability, ensuring pleasant air diffusion to adjacent rooms, and maintaining a clean line on a white wall with no visible casing.
We opted for a rear outlet configuration: the refrigerant connections and the condensate drain leave the unit directly behind the rear panel, without internal capping , to join the front. This approach eliminates visual clutter, protects the pipes and facilitates maintenance. The high positioning (approximately 2.1–2.2 m) promotes air mixing and frees up space for everyday use in a passageway.
What we did, step by step
Technical visit and sizing
At AirGreen, the selection of capacity (BTU) is based on the surface area, orientation, thermal envelope, and occupancy habits. For a typical Rosemont apartment, the common range is between 9,000 and 18,000 BTU for the main head. We validate:
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load losses and column heights linked to the route,
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electrical compatibility for a dedicated 240 V circuit (15 A or 20 A depending on capacity),
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location of the outdoor condenser with compliant clearances and snow-cleared access in winter.
Template, anchors and clearances
We install the wall bracket on a solid structure (uprights), anchored if necessary in the masonry. Clearances are respected: top, sides and in front of the unit to guarantee maintenance, access to the filter and performance measurement . Above a door, the horizontal alignment and the setback from the frame avoid turbulence directly on the opening.
Drilling and sealing
A single through-hole is made with a controlled slope (≈ 5–10 mm towards the outside) to ensure gravity drainage of condensates. We install a sheath and then carefully seal (closed-cell foam + exterior sealant) for a continuous air-water-vapor barrier. This detail improves comfort and energy performance by limiting infiltration.
Refrigeration connections and insulation
Annealed copper tubing (typically 1/4"–3/8" for 9–12 kBTU or 1/4"–1/2" for 15–18 kBTU) is smoothly rolled out and flared to Gree's recommended sizing. High-density insulation is joined and sealed at the connections to cut off any thermal bridges and prevent condensation . On the outside, the pipes are protected by a UV-protected cover that matches the facade when visible; here, the direct rear outlet makes the connections almost invisible from the inside.
Condensate drainage
Gravity drain is preferred: no pump, no additional noise, less maintenance. We check the slope up to the outside discharge and install an air trap if required by the configuration.
Power supply and protections
Connection to a dedicated circuit breaker with a compliant external disconnect. Grounding, sealing of penetrations, and length management to limit any voltage drop. Circuit labeling in the panel.
Pressurization, vacuuming and commissioning
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Nitrogen test to check for leaks,
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deep vacuum draw to the levels expected by the manufacturer,
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opening of valves, functional tests in cooling and heating modes,
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adjustments to the shutters to direct the airflow towards the kitchen and living room, not towards the door,
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checking superheat/subcooling and currents.
Expected result
A silent system, gentle diffusion along the corridor axis and uniform comfort in the adjoining rooms. The high position clears the passage, reduces exposure to shocks and simplifies filter cleaning .
Why a Gree R-32 for Montreal?
New generation efficiency and refrigerant
The Gree R-32 wall-mounted series combines high seasonal efficiency with a reduced carbon footprint compared to R-410A. On our construction sites in Montreal, these units demonstrate:
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reliable heating in cold weather , with extreme cold versions capable of maintaining useful power at −25 to −30°C depending on the series;
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inverter modulation which precisely adapts the power to the needs, limiting the short cycle in mid-season;
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low noise levels , appreciable in a corridor.
Eligibility for programs
Depending on the capacity and series selected (approved, high-efficiency, and extreme cold models), the installation may be eligible for grant programs in effect in Quebec. We support customers from start to finish: documentation, AHRI numbers , technical data sheets, and proof of compliant installation.
Salient installation details to remember
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Head above a door : respect clearances and direction of the airflow to avoid turbulence on the opening and push the air towards the living areas.
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Rear outlet without interior cover : clean aesthetics, protected pipes and minimized pressure loss .
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Gravity drainage : increased reliability, no condensate pump and silence .
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Sealed perforation : continuity of the air barrier and watertightness.
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Fine adjustments during commissioning: shutters, anti-frost detection, calibration of modes for the Montreal climate .
Good practices and pitfalls to avoid
Best practices
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Size capacity (BTU) based on a realistic heat load , not just surface area.
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Place the head high up in a central area, with a clear view of the rooms to be served.
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Promote a gravity drain and control the slope every meter.
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Protect the exterior connections with UV cladding coordinated with the facade.
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Document the installation: photos, AHRI number, commissioning parameters .
Pitfalls to avoid
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Install too close to the ceiling or molding : risk of recirculation of hot/cold air and noise.
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Blowing directly onto a narrow corridor without directing the shutters towards the rooms: discomfort and stratification .
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Under-insulate pipes: condensation, leaks and stains on walls.
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Forgetting the external disconnect or the dedicated circuit: non-compliance and difficult diagnostics.
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Neglecting vacuum and nitrogen testing: performance and longevity suffer.
HVAC maintenance: simple and profitable
Annual maintenance ensures stable performance:
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Cleaning the filters (every 4–8 weeks during peak usage),
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inspection of the drain and external discharge,
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control of intensities , fans and cleanliness of the exchanger,
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checking the condenser supports , snow clearance and cowling.
We offer HVAC maintenance plans tailored to apartments and plexes in Montreal, Laval, Longueuil, North Shore and South Shore .
Frequently Asked Questions (selection)
Can it be installed above a door?
Yes, if the clearances are respected and the shutters are adjusted to direct air into the rooms. This is often an excellent aesthetic compromise in a hallway.
Condensate or gravity pump?
Gravity is preferred when the architecture allows it: silence , reliability and less maintenance.
What are the installation times?
After technical validation and procurement, we plan the intervention with a slot that minimizes the impact on the occupancy of the accommodation. The installation of a single-head wall is generally done during the day , commissioning included.
AirGreen, local HVAC partner
Based in Greater Montreal , we manage each project from design to commissioning , including grant documentation and maintenance . For a high-performance Gree wall-mounted heat pump , carefully integrated and designed for our winters, our team delivers a clean, durable and compliant installation.
Need an on-site estimate for a similar project in Rosemont, Laval , Longueuil , North Shore or South Shore ? We come, we measure, we advise, and we install.
Keywords: heat pump , wall-mounted air conditioner , HVAC installation , HVAC maintenance , Montreal , Laval , Longueuil , North Shore , South Shore , Gree , R-32 , extreme cold .