Installation of a Gree multi-zone wall-mounted heat pump in Mercier–Hochelaga-Maisonneuve
In Mercier–Hochelaga-Maisonneuve, we installed a Gree multi-zone wall-mounted heat pump on a raised stand, with carefully routed refrigerant lines and vibration control. An ideal solution for heating and cooling multiple rooms while saving on electricity bills, both summer and winter.
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The article, chapter by chapter
In the Mercier–Hochelaga-Maisonneuve residential neighbourhood of Montreal, we recently installed a Gree multi-zone wall-mounted heat pump in a typical single-family home. The client wanted to completely modernize their comfort: efficient air conditioning in several rooms during the summer, effective heating in the winter, while also reducing their electricity bill compared to their existing baseboard heaters.
Context of the house and challenges of the project
The property includes:
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of a compact backyard ,
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of a plaster/concrete wall directly overlooking the passageway,
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of a slightly sloping plot of land with gravel and soil,
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vegetation and shrubs providing partial shade.
The available space was therefore limited for accommodating the outdoor unit. We had to:
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maintain adequate clearance around the condenser ,
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protect the heat pump from snow and ice in winter,
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to avoid vibrations and noise for occupants and neighbors,
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optimize the routing of refrigeration lines to the various indoor wall-mounted units.
Choosing a Gree multi-zone wall-mounted heat pump
For this project, we recommended a Gree multi-zone wall-mounted heat pump with modern refrigerant (Multi R32 type), capable of powering several indoor units from a single outdoor condenser.
This choice offers several advantages:
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A single outdoor block rather than several units lined up in the courtyard.
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Up to three independent zones : living room, bedrooms and/or basement, depending on the client's needs.
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Gree inverter technology ensures fine power modulation, ideal for Montreal's climate.
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Excellent energy efficiency, both in air conditioning and heating, allowing substantial savings on the electricity bill.
The Gree brand is known for the reliability of its wall-mounted heat pumps, their quiet operation and their compatibility with Quebec winters when the models are chosen and sized correctly.
Details of the outdoor installation
In the photo, you can clearly see:
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the Gree condenser installed along the wall of the house,
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an elevated steel structure resting on four concrete blocks,
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Anti-vibration feet to limit noise transmission,
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insulated refrigeration lines that run neatly up the wall.
1. Elevated support for winter
Instead of placing the unit directly on the ground, we installed it on a raised galvanized steel stand . This approach allows for:
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to keep the heat pump well above the layer of snow that accumulates in winter,
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to reduce the risks of corrosion and water infiltration ,
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to facilitate the manual removal of snow around the device,
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to ensure better air circulation, even during storms.
Each leg of the support rests on a stable concrete block, which distributes the weight and prevents the structure from sinking into the ground with freezing and thawing.
2. Vibration and noise management
To ensure quiet operation, we used:
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anti-vibration mounts between the structure and the Gree unit,
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precise tightening of the support to avoid any resonance,
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a calculated positioning so that the noise is directed towards the garden area rather than towards the windows of the house or those of the neighbors.
Result: even when the heat pump is running at a higher speed in very hot or very cold weather, the noise level remains very discreet .
3. Routing of multi-zone refrigeration lines
On the right of the image, you can see a bundle of insulated pipes leading from the condenser to the various wall-mounted units inside. For a multi-zone system, each zone has its own circuit:
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We have grouped these circuits into a neatly attached bundle .
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We took care to limit overly tight bends to preserve performance.
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The whole thing is fixed to the wall in such a way as to withstand wind, snow and temperature variations.
Inside, the Gree wall-mounted heads are strategically placed to serve the most frequently used rooms in the house:
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a unit in the living room for the main living area,
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One or two units with bedrooms for optimal comfort at night.
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possibly an additional area in the basement or office, depending on the client's needs.
Summer and winter performance in Mercier–Hochelaga-Maisonneuve
The neighborhood experiences hot, humid summers with periods of intense heat, and harsh winters that can reach -20°C or lower. The installed Gree multi-zone heat pump is designed to:
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to provide fast and uniform air conditioning of rooms, even in direct sunlight;
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to ensure efficient heating at low temperatures , limiting the need for baseboards;
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precisely modulate the power to maintain a stable indoor temperature without unpleasant fluctuations.
The occupants thus benefit from:
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four-season comfort ,
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with better circulated and more homogeneous air ,
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reduced electricity bills thanks to the high efficiency of inverter technology.
Aesthetics and integration into the courtyard
Even though the courtyard is relatively small, the installation was designed to:
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occupy as little floor space as possible ,
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maintain a clear passage for maintenance and traffic,
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to allow the presence of vegetation and accessories (lawnmower, tools, etc.) without affecting the operation of the heat pump.
The Gree unit, in a neutral color, blends well with the light-colored plastered wall. The shrub branches create a light shade, which can help limit direct sunlight while ensuring sufficient space for ventilation.
Recommended maintenance for the Gree heat pump
To ensure the longevity of the installation, we advise our clients:
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to remove the snow accumulated under and around the condenser in winter;
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to check that nothing obstructs the air intake and exhaust (branches, leaves, objects);
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to have the filters of the indoor units cleaned several times per season;
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to plan for regular professional maintenance (inspection, coil cleaning, refrigerant check, etc.).
This preventative approach helps to maintain optimal performance and limit the risk of breakdowns, especially during periods of high demand (heat waves or extreme cold).
AirGreen: your partner for Gree multi-zone systems in Montreal
This project in Mercier–Hochelaga-Maisonneuve perfectly illustrates our expertise in the installation of Gree multi-zone wall-mounted heat pumps :
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analysis of the building and the courtyard,
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selecting the right device and the right size,
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Careful installation on a raised support.
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vibration, noise and aesthetic management,
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comprehensive support for owners on use and maintenance.
If you are considering installing a Gree wall-mounted heat pump , whether it is a simple or multi-zone system, our team travels throughout Greater Montreal to offer you a solution tailored to your home, your budget and your comfort.
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).