Installation of a Gree Charmo wall-mounted heat pump in Rosemont–La Petite-Patrie
Discover this AirGreen installation of a Gree Charmo wall-mounted heat pump in Rosemont–La Petite-Patrie, perfectly suited to urban brick buildings and the Montreal climate.
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.
As part of a recent residential project in Rosemont–La Petite-Patrie , our AirGreen team completed the installation of a Gree Charmo wall-mounted heat pump , a perfect choice for the brick buildings typical of this Montreal neighbourhood. This type of building, often composed of stacked apartments with limited ground-floor access, demands a rigorous approach from both a technical and aesthetic standpoint.
A dense Montreal neighborhood that requires specific technical choices
Rosemont–La Petite-Patrie is known for its urban density , brick facades, and multi-story buildings. For this project, the outdoor unit had to be installed high up, securely attached to the wall, to comply with ground space and clearance requirements. This configuration is very common in central Montreal neighborhoods, where every detail counts to ensure safety, compliance, and durability.
Type of system installed: wall-mounted heat pump
We installed a wall-mounted heat pump (mini-split) , a system particularly popular in Montreal condos and multi-unit buildings. This type of unit allows you to:
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efficient heating in winter ,
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efficient air conditioning in summer ,
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precise temperature control by zone,
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a minimally invasive installation, without ducts.
The Gree Charmo fits perfectly into this category, offering an excellent balance between energy performance, reliability and acoustic comfort.
Brand and model: Gree Charmo
The Gree Charmo is a wall-mounted heat pump renowned for its proven technology and its ability to adapt to the Quebec climate. While several capacities are available to suit different needs (generally 9,000 to 24,000 BTU), this line is designed to offer:
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excellent energy efficiency ,
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stable operation during temperature variations,
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ideal compatibility with wall installations in urban environments.
In this project, the choice of model was made to meet the specific needs of the housing, taking into account the surface area, orientation and insulation of the building.
Visible installation details and protruding elements
Several technical elements clearly stand out from this installation:
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High-level wall-mounted outdoor unit , fixed on a robust galvanized steel support, freeing up floor space and reducing risks related to snow and ice accumulation.
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Vertical routing of refrigerant lines , carefully concealed in a dark pipe cover , ensuring a clean and harmonious visual integration with the brick.
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The cache's "Z" pattern , typical of multi-story installations, demonstrates a precise adaptation to the configuration of existing windows and openings.
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Dedicated outdoor electrical box , installed near the unit, compliant with the standards in force in Quebec.
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Careful management of cables and conduits to preserve the aesthetics of the facade, an essential point in a residential area like Rosemont.
Four-season comfort, designed for Montreal's climate
Installing a Gree Charmo wall-mounted heat pump in Montreal means choosing a system that ensures consistent comfort year-round . In summer, the wall-mounted unit maintains a pleasant temperature, even during urban heat waves. In winter, the heat pump efficiently contributes to heating, reducing reliance on traditional electric systems and helping to control energy costs.
Why entrust this type of project to AirGreen?
At AirGreen , we specialize in residential HVAC installations in Montreal, Laval, and on the North and South Shores. Our approach is based on:
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a precise analysis of the building and the neighborhood ,
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technical solutions adapted to urban realities ,
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meticulous execution, both mechanically and aesthetically,
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strict adherence to electrical and safety standards.
Each installation is designed to integrate naturally into the existing environment, while offering optimal performance and long-term peace of mind.
An ideal solution for Montreal's brick buildings
This project in Rosemont–La Petite-Patrie perfectly illustrates how a Gree Charmo wall-mounted heat pump can be efficiently installed in a dense urban environment, without compromising performance or the building's exterior appearance. It's a modern, reliable, and sustainable solution for homeowners looking to improve their indoor comfort while increasing their property value.
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).