Installation of a Gree wall-mounted heat pump in the Southwest district (Montreal)
In Montreal's Southwest borough, AirGreen installed a Gree wall-mounted heat pump on a circulation wall of a modern condo. Strategic positioning, discreet installation, and energy efficiency allow the owners to enjoy optimal heating and cooling comfort year-round.
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The job on one screen

The article, chapter by chapter
For this project, our AirGreen team worked in a modern condo in Montreal's Southwest borough . The owners had just renovated their space: white walls, recessed lighting, polished concrete floors. Only one thing was missing to complete the comfort: a high-performance, discreet, and economical heating and cooling system.
We recommended they install a Gree wall-mounted heat pump , an ideal single-zone solution for this type of partially open-plan urban dwelling.
A strategic positioning at the heart of traffic
The Gree indoor unit is installed high on a circulation wall , between a side window and the opening leading to the rest of the condo. This location was not chosen at random:
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the blower can push air along the corridor and towards adjacent rooms;
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the device remains perfectly clear : no furniture or obstacle in front, which ensures optimal diffusion;
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the height allows for a homogeneous mixing of warm air in winter and cool air in summer ;
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The unit integrates naturally into the minimalist architecture: smooth wall, discreet electrical outlets, recessed spotlights in the ceiling.
A high ventilation grille is also visible nearby, contributing to good overall air circulation within the unit. The result: a central comfort zone that serves as the thermal heart of the condo.
Choosing a Gree wall-mounted heat pump
For this project, we opted for a new generation Gree wall-mounted heat pump , approximately 12,000 BTU, perfectly sized for:
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efficiently heat the main living space;
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cooling the condo during Montreal heat waves;
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limit energy consumption thanks to high-efficiency inverter technology.
With this type of device, owners benefit from:
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of a very economical heating system compared to electric baseboard heaters;
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quiet air conditioning in summer, without the bulk of a window air conditioner;
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of a stable temperature thanks to continuous power modulation;
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four-season comfort, adapted to harsh Quebec winters .
The heat pump quickly becomes the main source of heating and cooling for the condo, with other systems only intervening as needed during extreme cold weather.
A clean, discreet and durable installation
In an urban condo, aesthetics are just as important as performance. Therefore, we paid particular attention to every detail:
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The refrigeration lines and communication cables run behind the unit, so as to keep the wall perfectly clean.
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The outward drilling was positioned to minimize the path of the connections, reduce pressure losses and limit the visual impact on the outside.
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The condensate drain is installed with an adequate slope, to reliably remove water without risk of drips on the wall or floor.
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The Gree external condenser (not visible in the photo) is fixed on a stable support with anti-vibration pads , to reduce noise and vibrations transmitted to the structure.
Before commissioning, we systematically perform the following:
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a complete evacuation of the refrigeration circuit;
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checking the electrical connections and the dedicated circuit breaker;
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comprehensive heating and air conditioning tests;
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adjusting operating parameters according to the needs of the occupants.
This rigorous approach guarantees a reliable, quiet system ready to provide years of service.
Four-season comfort in a Southwest condo
In a neighborhood like Le Sud-Ouest , where condos and semi-open-concept lofts are numerous, a Gree wall-mounted heat pump makes all the difference:
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In winter , the unit provides gentle and consistent heat. Warm air spreads along the corridor and into adjacent rooms, reducing the feeling of cold spots.
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In summer , the air conditioning mode quickly lowers the temperature and reduces humidity, without aggressive drafts.
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In the mid-season, the dehumidification function helps to improve comfort even when the outside temperature is not very high.
Thanks to their unobstructed positioning on the wall, the motorized shutters can optimally direct the airflow. Occupants can thus fine-tune the temperature according to their lifestyle: working from home, evenings at home, visits from friends, etc.
An investment that reduces the energy bill
Beyond comfort, the homeowners also aimed to reduce their energy costs . They achieved this by replacing much of the work done by electric baseboard heaters with a Gree heat pump.
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a significant portion of the annual heating is provided by a much more efficient system;
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air conditioning no longer requires the purchase and seasonal installation of window units;
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The value of the condo is enhanced by the presence of modern and sought-after equipment in the real estate market.
Over several years, the savings made help to amortize the investment, while increasing daily comfort.
AirGreen: Your Gree heat pump specialist in Montreal
At AirGreen, we support condo, house, and plex owners throughout Greater Montreal by:
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analyze the layout of their accommodation;
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recommend the right capacity and range Gree ;
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to create a clean installation, compliant with standards and designed to last;
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to offer professional after-sales and maintenance service.
Whether you are in the Southwest, Griffintown, Verdun or elsewhere in Montreal , our team is here to transform your space into a four-season comfort zone, while controlling your energy costs.
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).
