Installation of a Gree (residential range) wall-mounted heat pump in Plateau-Mont-Royal
Installation of a Gree wall-mounted heat pump in Plateau-Mont-Royal: short run, gravity drainage, quiet settings. AirGreen installs and maintains your HVAC systems in Montreal, Laval, Longueuil, North Shore, and South Shore.
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Careful integration into a room with a high ceiling, designed for comfort and silence
At AirGreen , we design each HVAC installation as a custom project. In this Plateau-Mont-Royal home, the challenge was to install a Gree wall-mounted heat pump in a room with high ceilings , with a floor-to-ceiling window equipped with a curtain rod. The goal: to ensure precise cooling in the summer and stable heating support in the mid-seasons, without compromising the aesthetics or quietness of the room.
Why Gree is essential here
Choosing a Gree unit meets three customer requirements:
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Energy efficient to reduce operating costs compared to a portable air conditioner.
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Quiet operation to preserve the tranquility of a room.
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Four-season capability (heating and cooling function) in a discreet format.
In this residential configuration, we remain within a typical capacity range of 9,000 to 12,000 BTU for a standard room with a high ceiling. While the exact model is not visible , the installation nevertheless follows the same installation and commissioning standards as for the most common Gree series in Montreal housing.
Technical reading of the part and positioning
Ceiling height
The room has a higher than average air volume. We therefore position the unit in the upper part , centered above the window lintel, in order to exploit the natural stratification and obtain even diffusion along the opposite wall.
Curtain management
Curtains can deflect the airflow from the wall-mounted air conditioner . We adjust the angle of the directional louver so that it blows under the rod band, with a horizontal sweep that covers the sleeping area without creating a direct draft.
Distances and clearances
The unit's size requires side clearances for air intake. We maintain free space around the sides and bottom of the unit to maximize flow and facilitate maintenance (filter cleaning, evaporator inspection).
Route of lines and drilling: clean, short, reversible
Through drilling
A single, low-slope hole is made behind the unit for the refrigerant pipes , communication cable and condensate drain . In a bedroom, the issue is as much acoustic as aesthetic: we use discreet white capping and a sealed bulkhead to prevent any infiltration of outside air.
Length and radius of curvature
The line length is optimized (approximately 2 to 3 m in this case) to limit pressure losses and respect the bending radii of the insulated copper tubes. This results in better performance and an external compressor that "forces" less.
Gravity drainage
The elevated installation allows for gravity drainage of condensate. We ensure a regular slope, an anti-siphon , and a maintenance access point. In the event of future constraints (e.g., redevelopment), the addition of a lifting pump remains possible without major rework.
An exterior as neat as the interior
Although the photo above shows the interior header, the quality of an HVAC installation can also be judged from the outside:
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Outdoor unit support : on wall brackets or on an anti-vibration base depending on the facade, in order to decouple vibrations and preserve acoustic comfort.
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Clearances : respect rear and side distances for good ventilation of the condenser .
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Climate protection : positioning that limits snow accumulation and facilitates defrosting in winter.
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Discreet path : the connections are covered on the facade, tinted if necessary to match the existing covering.
Key steps in AirGreen installation
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Technical visit and validation of thermal loads : taking measurements, evaluation of the volume of the room, solar exposure, insulation, ambient noise.
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Marking and fixing the plate : anchors adapted to the support (wood, brick, gypsum with uprights), level control to avoid flow noises.
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Drilling and capping : small diameter through hole, waterproof sheath , coordinated interior/exterior capping .
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Passage and brazing of lines : precise bending, nitrogen brazing , deep vacuum (<500 microns) to guarantee a clean and dry circuit.
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Electrical connections : dedicated circuit to the panel, calibrated circuit breaker and proximity switch to the outdoor unit, RBQ/CSA compliant.
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Commissioning : opening of the fluid, pressure control, superheating/subcooling measurements , verification of intensities and blown temperatures.
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User settings : modes, speeds, flow direction, programming and HVAC maintenance tips.
Results: stable comfort and controlled acoustics
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Even temperature : the projection of air at the top breaks the cold wall effect of the window and avoids annoying stratifications in a high room.
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Quiet : The Gree wall-mounted heat pump is set to fan speeds suitable for sleep, with minimal noise levels .
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Savings : thanks to the inverter , the machine modulates its power to maintain the set point with reduced consumption .
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Versatility : in mid-season, the heating mode ensures rapid comfort without starting a more energy-intensive central system.
AirGreen tips for this type of room
Air settings
For a wall-mounted air conditioner above a window, we recommend orienting the louver slightly upward in cooling mode to promote air mixing, and downward in heating mode to bring heat to the occupied area.
Interview
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Filters : clean every 4 to 8 weeks during periods of intensive use.
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Battery : annual inspection, dusting and disinfection if necessary.
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Exterior : maintaining free space around the condenser, clearing snow in winter.
Points of vigilance
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Avoid blocking the air intake (furniture, curtains too close).
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Do not obstruct the condensate drain during decorative work.
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Program an automatic speed at night to limit variations and noise.
Grants and Eligibility
Several Gree wall-mounted heat pumps available on the market boast high efficiencies and low-temperature performance. Grant eligibility, however, depends on the exact model (SEER2/HSPF2/SCOP) and the program's current criteria. During our visits, we systematically check:
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the power adapted to the room,
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the level of performance ,
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the necessary supporting documents (invoices, AHRI ).
Thus, our customers in Montreal, Laval, Longueuil, North Shore and South Shore receive comprehensive support to maximize the available assistance when the chosen equipment is eligible.
What this achievement says about our method
This installation on the Plateau-Mont-Royal illustrates our approach:
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Detailed analysis of volumes and constraints (high ceiling, carpentry, aesthetics).
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Impeccable installation on the refrigeration and electrical side for durability .
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Ergonomics of use : adjustments, advice, maintenance monitoring.
For a similar project— Gree wall-mounted heat pump , wall-mounted air conditioner , multi-zone , or central system —our teams respond quickly anywhere in Greater Montreal . We size, install, and maintain your solution with AirGreen rigor, so that comfort remains discreet… but very present.
The job tools
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
How the job unfolds
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What we check on a job like this one
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Good habits, once the unit is in place
Six simple habits that keep the unit going. Your list stays on this device.
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
The right pages, at the right time
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).