Installation of a Gree Charmo wall-mounted heat pump in Rosemont–La Petite-Patrie (Montreal)
AirGreen completed the installation of a Gree Charmo wall-mounted heat pump in Rosemont–La Petite-Patrie, with an outdoor unit mounted high on a wall bracket to protect the equipment from snow, improve clearance and ensure a clean finish on a brick facade.
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 several areas of Montreal, especially in typical brick buildings like those often seen in Rosemont–La Petite-Patrie, the installation of a wall-mounted heat pump (mini-split) requires a very precise approach: performance must be targeted, but also respect for the facade, noise reduction, and a configuration that remains reliable in the middle of winter.
At AirGreen , we recently installed a Gree Charmo wall-mounted heat pump on a brick residential building, with the outdoor unit mounted high on a wall bracket. This type of installation is particularly popular in urban areas, as it minimizes the footprint and protects the equipment from the elements in the backyard (snow, ice, water accumulation, debris, etc.).
Why a wall-mounted heat pump in Rosemont–La Petite-Patrie?
In Rosemont, you often find:
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semi-basement apartments with low windows,
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rear walls made of brick or blocks,
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restricted access (small courtyards, narrow passages),
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a clear desire from the owners: an efficient, discreet, and visually clean system .
The Gree Charmo wall-mounted heat pump fits well into this context: it allows air conditioning in the summer and heating in the off-season , with precise temperature control and stable comfort, room by room.
Type of machine installed
Here we have a wall-mounted heat pump (mini-split / wall unit) , composed of:
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1 indoor unit (not visible in the photo, usually installed in a living room, open area or main floor),
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1 outdoor unit (visible), which provides heat exchange and compression.
This format is very well suited to Montreal homes when you want to improve comfort without redoing the entire air distribution of a house (no ducts to add, no major work).
Make and model
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Brand: Gree
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Model: Charmo
In this type of range, the objective is to have an efficient, reliable, and easy-to-maintain wall system — while keeping an installation that respects good HVAC practices (vibrations, clearances, drainage, winter protection).
What the installation reveals in the photo
Even without seeing the interior, the exterior installation gives us several important elements:
1) High wall mounting: a strategic decision
The outdoor unit is mounted on a sturdy wall bracket , clearly designed for:
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avoid direct contact with the ground (water, ice, mud),
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reduce the risks associated with snow (accumulation and blizzards),
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to facilitate cleaning around the unit,
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preserve space in the courtyard (practice in urban environments).
In a neighborhood like Rosemont, this option is often superior to a concrete slab, especially if the ground drains poorly or if the yard is heavily used.
2) Installation of pipes and careful finishing
We observe a protected vertical descent (covering/clean path), which is essential for:
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protect the refrigeration lines and cables,
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to maintain a clean appearance on a brick facade,
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limit exposure to shocks and UV rays.
At AirGreen, we pay attention to this detail because it's exactly what customers notice on a daily basis: a "clean" job that blends into the building .
3) Secure power supply
We can see an electrical connection with a clear path to a service box. This is a crucial point:
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for safety ,
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for compliance ,
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and for future diagnostics (maintenance, troubleshooting).
A well-designed installation is also one that will remain easy to maintain in 3, 5 or 10 years.
4) Clearances and positioning near windows: managing comfort and noise
The unit is installed between openings, on a clear wall. In this type of configuration, our logic is always the same:
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aim for a place with good ventilation (clear opening),
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avoid being too close to a bedroom
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to limit the transmission of vibrations to the building,
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take into account the habits of the occupants (open windows, balcony, courtyard).
This is where expertise counts: two installations may “work”, but only one will be truly comfortable and discreet in the long term.
The technical points that we systematically manage on this type of project
Vibration management
On a wall mount, vibration can become a problem if the anchoring is improper or if the mount is undersized. We ensure that:
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fix in reliable structural points,
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use stable and durable installation methods,
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limit vibration transmission as much as possible (a detail that makes all the difference for sound comfort).
Drainage and defrosting water
In heating mode, a heat pump defrosts: it releases water at the bottom of the outdoor unit. In Montreal winters, this water can freeze and accumulate. Our approach:
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provide a clearance area under the unit.
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prevent water from falling onto a step, a passageway, or near a basement window.
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take into account the slope of the land and the surfaces (asphalt, concrete, gravel).
Protection against snow and extreme conditions
In Montreal, snow is not a "detail." A unit that is too low risks:
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to be blocked by a snowbank,
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to lose performance
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or to be damaged.
Mounting it at a height helps a lot, especially in a backyard where snow naturally accumulates against the walls.
Performance and comfort: the ultimate goal
A well-installed Gree Charmo is:
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stable air conditioning in summer, even during humid periods
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efficient heating during autumn and spring,
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a more consistent feeling of comfort (fewer cold or stuffy areas),
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precise control, often highly valued in homes where insulation varies from room to room.
Why this type of installation is popular with our clients in Montreal
Many homeowners in Rosemont–La Petite-Patrie want to modernize their comfort without altering their building. A wall-mounted heat pump perfectly meets this need:
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Installation was relatively quick.
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limited impact on interior walls,
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no additional conduits needed.
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Immediate improvement in comfort.
And above all, when the outdoor unit is installed properly (wall bracket, clear routing, clearances respected), the result is both technical and aesthetic .
Our AirGreen approach: performance + finish + durability
At AirGreen, we don't just aim for "it to work". We aim for:
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an installation designed for the Quebec climate,
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a visual finish consistent with the facade,
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an easy-to-maintain configuration,
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real comfort for the occupants (noise, stability, positioning).
It is this combination that makes the difference between a correct installation… and an installation that the customer is proud of.
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).