Installation of a Gree Charmo wall-mounted heat pump in Ville-Marie (Montreal)
AirGreen installed a Gree Charmo wall-mounted heat pump in Ville-Marie to ensure consistent comfort in an open-plan living area. High placement, balanced air distribution, careful installation, and maintenance recommendations: a discreet, efficient result perfectly suited to Montreal conditions.
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 a typical Ville-Marie apartment, every square meter counts: open-plan living room and kitchen, large windows, furniture close to the walls, and the need for consistent comfort year-round. This is precisely the context for this Gree Charmo wall-mounted heat pump installation by AirGreen, designed to provide rapid cooling in summer, efficient heating in the shoulder seasons, and above all, pleasant air circulation without direct drafts.
A logical choice for an open-plan living space
In this type of urban development, a wall-mounted heat pump (mini-split) is often the most cost-effective and cleanest solution to install:
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No major renovations : no ducts to add, nor false ceilings to open.
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Zoned comfort : the focus is on the main space (living room/dining room) where daily life takes place.
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High efficiency : ideal for maintaining a stable temperature despite solar gains near windows.
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Silence : essential in a condo or apartment where quiet is an important criterion.
The Gree Charmo fits perfectly into this logic: a compact, understated indoor unit, efficient enough to manage a main space without weighing down the aesthetics of the room.
Placement analysis: high on the wall, for better diffusion
In the photo, the indoor unit is installed high up , near the ceiling, on a clear wall. This positioning is intentional, and we often prefer it in Montreal for several reasons:
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Improved air distribution : the treated air can circulate more evenly throughout the room.
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Fewer “hot” or “cold” zones : especially useful in an elongated space.
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Everyday comfort : we prevent the airflow from reaching seated occupants directly (sofa, desk, table).
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Aesthetics : the unit is discreet, without encroaching on circulation or decoration areas.
In this specific case, installation near the window is also beneficial: windows are often a source of temperature fluctuations (sun, winter cold, drafts). Positioning the unit to counteract these fluctuations helps stabilize comfort.
Salient installation details observable and AirGreen best practices
Although the photo mainly shows the indoor unit, several key elements are implied in a clean and sustainable installation:
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Drainage management (condensate) : in air conditioning mode, the water must be drained with an adequate slope to avoid any risk of leakage.
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Discreet routing of connections : we aim for a neat finish (pipe cover or optimized passage) to preserve the visual appearance of living spaces.
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Adjusting the flap (air direction) : essential to avoid the “direct blow” effect on a workstation or relaxation area.
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Solid fixing and perfect level : a detail that makes all the difference in limiting vibrations and unwanted noise.
We also attach great importance to the logic of use: a high-performing mini-split is good; a mini-split that is well set up and well explained to the customer is even better.
Summer comfort… and intelligent management of cold periods
In Ville-Marie, buildings are often well-insulated but exposed: strong sun during the day, rapid temperature changes in the evening, and sometimes a "greenhouse effect" in the summer. A wall-mounted heat pump like the Gree Charmo is very well suited to these conditions:
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Rapid cooling when the room overheats.
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Stable maintenance rather than aggressive cycles (more comfortable, more economical).
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Noticeable dehumidification during the sticky periods in Montreal.
In winter and mid-season, the heat pump becomes an excellent complement: it helps to maintain a comfortable temperature without relying solely on the main heating system (depending on the configuration of the dwelling).
What we always check before finalizing this type of installation
Even though the indoor unit is the visible part, the quality of a project is determined much earlier. At AirGreen, our typical checks include:
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Realistic sizing (not “too big” / not “too small”) according to the surface area, sunlight, insulation and use.
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Outdoor location (condenser): noise, clearance, access for maintenance, compliance with condominium rules if applicable.
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Length of connections and feasibility of passage (wall, structure, finishes).
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Vibration protection and simple maintenance planning.
This is what makes it possible to obtain a system that performs well for a long time, and that remains pleasant to use on a daily basis.
Why the Gree Charmo is a good fit for this type of interior
Without getting into unnecessary numbers, here's what generally makes this "wall-mounted" approach so effective in a condo or urban dwelling:
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A simple , effective , and quick-to-install solution.
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Comfort is felt immediately thanks to direct diffusion into the living area.
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A discreet device that blends well into a modern setting.
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Better control of comfort in summer (and a real added value in everyday life in Montreal).
Maintenance: the detail that protects performance
In this type of space, dust and particles (from cooking, textiles, and foot traffic) can clog the filters faster than you might think. To maintain optimal performance:
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Cleaning/inspection of filters at a frequency appropriate to usage.
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Seasonal check of drainage and proper flow.
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Regular professional maintenance is required to preserve heat exchange and reliability.
We always explain these points clearly, because a well-maintained device is a quieter, more stable, and more durable device.
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).