Installation of a Gree wall-mounted heat pump in Rosemont–La Petite-Patrie
In Rosemont–La Petite-Patrie, AirGreen installed a Gree wall-mounted heat pump on a central wall to efficiently heat and cool an open-concept living area. Discreet design, increased comfort, and lower energy bills: discover how this system transforms the daily lives of homeowners.

Take a tour of the installation
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.
In this project, our AirGreen team moved into a cozy ground-floor apartment in Rosemont–La Petite-Patrie to modernize the homeowners' comfort. Their goal was clear: reduce reliance on electric baseboard heaters, improve summer air conditioning, and obtain reliable heating for Montreal winters, all without altering the appearance of the main living space.
We suggested they install a Gree wall-mounted heat pump , a high-performance and discreet single-zone system, perfectly suited to open living areas like this one.
A central location for maximum comfort
The indoor unit was installed high up on a central wall separating the entrance and the kitchen . This choice was not insignificant:
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The blower can sweep through the living room, the entrance hall, and the kitchen all at once .
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Warm air in winter and cool air in summer are distributed evenly.
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The device remains discreet, well integrated into the partition already occupied by existing thermostats and controls.
The Gree wall unit, with its sleek, glossy white design, complements the light walls and contemporary finish of the house. Motorized louvers automatically direct airflow towards passageways, preventing direct drafts on the sofa or dining table.
Choosing the Gree wall-mounted heat pump
We recommended a new generation Gree wall-mounted heat pump, approximately 12,000 BTU , sized to comfortably cover the main living area of this Rosemont home.
With this type of device, owners benefit from:
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efficient and economical heating for a good part of the winter,
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of silent air conditioning during Montreal's heat waves,
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with an inverter system that automatically modulates the power to maintain a stable temperature without sudden variations,
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reduced consumption compared to electric baseboards, thanks to a very good performance ratio (COP).
The wall-mounted remote control and the electronic controls already installed on the partition allow for easy management of the temperature and operating modes (heating, cooling, dehumidification, ventilation). This gives the customer precise control room by room while making the heat pump the primary source of comfort in the living area.
A carefully designed installation, built to last.
Even though we only see the interior unit here, the care taken in the installation extends beyond the wall and to the exterior:
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The refrigeration lines pass through an optimized drilling behind the unit, minimizing the visual impact inside;
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The communication and power wiring is neatly integrated, in coordination with the electrical boxes already present on the partition;
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Outside, the Gree condensing unit is installed on anti-vibration supports and pads , slightly raised off the ground to avoid snow accumulation;
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Condensate drainage is managed safely to prevent any infiltration or trace of water inside.
As always at AirGreen, we checked:
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electrical compliance and protection by a dedicated circuit breaker,
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the complete evacuation of the refrigeration circuit,
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proper functioning in both heating and air conditioning systems
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the actual sound level in the room once the installation is complete.
The result: a silent system, no perceptible vibration in the partition, and comfort felt from the moment it is switched on.
Tangible benefits for homeowners
From the very first days of use, customers notice:
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a more consistent temperature between the kitchen, the entrance and the living room;
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a reduction in the use of electric baseboard heaters , particularly during the off-season;
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a more pleasant humidity level in summer, thanks to the air conditioning and dehumidification mode;
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better control of comfort when coming and going through the back door, a point often considered cold in houses of this type.
The Gree wall-mounted heat pump thus becomes the heart of the home's comfort system, while the existing emitters only take over during periods of extreme cold.
AirGreen: Your Gree heat pump expert in Montreal
As an HVAC contractor specializing in residential heat pumps in Greater Montreal, we support our clients from start to finish :
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analysis of the needs and layout of the house,
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Gree recommends the correct capacity and range.
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Professional installation compliant with standards.
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commissioning and usage tips to maximize energy savings,
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After-sales service and maintenance to guarantee the longevity of the system.
Whether you are in Rosemont–La Petite-Patrie, Villeray, Hochelaga or elsewhere in Greater Montreal , our team is here to transform your home into a comfortable space, summer and winter, thanks to Gree wall-mounted heat pumps.
If you are also considering upgrading your heating and air conditioning, contact AirGreen: we will be happy to assess your project and offer you the most suitable solution for your home and budget.
The big day, step by step
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 would it look like at your place?
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.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
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.
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.
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).
