Installation of a GREE CHARMO R32 wall-mounted heat pump in Nuns' Island, Montreal: a compact, efficient, and well-thought-out solution for an urban condo
AirGreen installs a GREE CHARMO R32 wall-mounted heat pump in Nuns' Island: efficient, discreet mini-split, perfect for Montreal condos, ensuring lasting comfort.
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.
An HVAC System Adapted to the Realities of Nuns' Island
On Nuns' Island, wall-mounted heat pump projects often require a more precise approach than in a traditional single-family home. Condos, apartment buildings, regulated facades, access constraints, piping distances, and co-ownership syndicate requirements are all elements that must be analyzed even before choosing the final location of the indoor unit and the outdoor condenser.
In this project carried out by AirGreen, our team proceeded with the installation of a GREE CHARMO R32 wall-mounted heat pump, a wall-mounted air conditioner – mini-split type system, in a residential unit located on Nuns' Island, Montreal. The client wanted to improve their comfort during the summer, reduce the humidity felt in the main rooms, and benefit from efficient auxiliary heating during colder periods of the year.
The choice of the GREE CHARMO R32 model proved to be a very interesting solution for this type of space: discreet, modern, efficient, compatible with the needs of urban housing, and designed with R32 refrigerant, known for its superior energy performance compared to several previous generations of refrigerants.
A Well-Chosen GREE CHARMO R32 Wall-Mounted Heat Pump for a Dense Residential Environment
The GREE CHARMO R32 model perfectly meets the expectations of owners looking for a reliable solution for daily comfort, without having to modify their entire existing heating system. In a condo on Nuns' Island, the objective is not just to install a machine: the system must be integrated cleanly, safely, durably, and in compliance with the building's constraints.
Why the GREE CHARMO R32 model was suitable for this project
The GREE CHARMO R32 stands out with several important advantages for urban installations:
- a compact wall-mounted design, ideal for condos and apartments;
- effective air conditioning during hot periods in Montreal;
- silent operation, particularly appreciated in open living areas;
- inverter technology allowing for more stable temperature modulation;
- the use of R32 refrigerant, which is more energy efficient;
- a sleek aesthetic that easily integrates into modern decor;
- good auxiliary heating capacity for transitional seasons.
In this specific case, the client wanted a solution that would not visually clutter the interior space. The wall-mounted unit had to be placed to maximize air distribution, while avoiding blowing directly on occupants when seated in the living room. This detail seems simple, but it makes a big difference in daily comfort.
A Frequent Need in Montreal Condos
On Nuns' Island, many residential buildings are very well insulated, but this can also lead to heat accumulation in summer, especially in sun-exposed units. Even when the outside temperature is not extreme, large windows, the apartment's orientation, and poor natural air circulation can make the interior uncomfortable.
This is why a well-sized HVAC installation becomes essential. A machine that is too weak will run constantly without achieving the desired comfort. A machine that is too strong risks cooling rapidly without properly dehumidifying the air. Our job is therefore to find the balance between power, efficiency, location, and actual use of the space.
In this project, the GREE CHARMO R32 heat pump was chosen to provide a stable, comfortable response tailored to the needs of a daily-occupied home.
Initial Analysis: Understanding the Space Before Installation
Before installation, our team evaluated several elements:
- the layout of the rooms;
- ceiling heights;
- window orientation;
- the most pronounced heat zones;
- possibilities for routing refrigerant lines;
- the authorized location for the outdoor condenser;
- the distance between the indoor and outdoor units;
- aesthetic constraints related to the building;
- electrical safety requirements;
- accessibility for future HVAC maintenance.
This step is particularly important in an area like Nuns' Island, where buildings may have specific regulations regarding exterior appearance, noise, penetrations, wall supports, and circulation in common areas.
At AirGreen, we always prioritize detailed planning before starting work. This helps avoid unpleasant surprises and ensures a clean installation from the first intervention.
Positioning the Indoor Unit
The indoor unit of the GREE CHARMO R32 was installed in a strategic zone allowing good air diffusion into the main space. In a condo, the choice of wall is rarely insignificant. It is necessary to consider comfort, aesthetics, the building's structure, and the path of the pipes to the outside.
The goal was to create smooth airflow without creating an unpleasant draft. We therefore avoided locations that would direct air directly towards a sofa, dining table, or workspace. The client sought constant comfort, not a localized cold sensation.
Our technicians also took care to respect the required clearances around the unit, to preserve the appliance's performance and facilitate access during cleaning or maintenance interventions.
Pipe Routing: Discretion and Precision
One of the most important aspects of this wall-mounted heat pump installation was the routing of the refrigerant lines, condensate drain, and communication wiring. In urban housing, every visible detail matters.
We planned a route that was as short and discreet as possible, while respecting the manufacturer's technical requirements. An adequate slope was provided to ensure efficient evacuation of condensation water. This point is crucial: poor drainage can cause leaks, odors, moisture stains, or avoidable service calls.
The installation was carried out with care to achieve a clean and professional finish. The lines were protected and organized to preserve both the system's performance and the overall appearance of the space.
The Outdoor Condenser: Stability, Noise, and Compliance
The outdoor unit of a mini-split heat pump must be installed with great care, especially in a co-ownership environment. The condenser must be stable, well-ventilated, accessible, and placed in a way that limits vibrations.
In this project on Nuns' Island, we paid particular attention to three elements:
-
Vibration Reduction
Appropriate supports were used to limit the transmission of vibrations to the building structure. -
Air Circulation Around the Condenser
Sufficient space was maintained around the unit to allow for good heat exchange. -
Accessibility for Maintenance
The positioning was designed to allow for future checks, cleaning, and technical interventions without unnecessary complications.
These details directly influence the system's durability. A poorly positioned outdoor unit can lose efficiency, become noisier, or wear out prematurely.
Rigorous Commissioning
Once the mechanical and electrical installation was complete, our team proceeded with the commissioning steps. This phase is essential to confirm that the GREE CHARMO R32 heat pump operates according to expected parameters.
Our technicians notably checked:
- the tightness of the refrigerant connections;
- the quality of the vacuum in the lines;
- communication between the indoor and outdoor units;
- proper functioning in cooling mode;
- proper functioning in heating mode;
- condensate water drainage;
- the stability of the discharged temperature;
- absence of abnormal vibration;
- the perceived sound level in the living space.
Commissioning is not just about starting the appliance. It confirms that the complete installation is reliable, safe, and complies with industry best practices.
Comfort Achieved After Installation
After installation, the client immediately noticed an improvement in indoor comfort. The air was better distributed, the temperature more stable, and humidity less present in the main rooms. In a condo, this feeling of comfort is often as important as the temperature drop itself.
A good wall-mounted heat pump should not only cool the air. It should create a pleasant, stable, quiet, and easy-to-control environment. The GREE CHARMO R32 met this expectation thanks to its modulating operation and its ability to adjust performance according to the actual needs of the space.
Mistakes to Avoid When Installing a Mini-Split in a Condo
This project perfectly illustrates some common mistakes we see in the HVAC field in Montreal, Laval, Longueuil, on the North Shore and the South Shore.
Choosing an appliance without checking building constraints
In a condominium, it's not enough to choose a brand or model. You must check building regulations, authorized locations, noise limits, facade standards, and access constraints.
Installing the indoor unit based on aesthetics alone
A visually discreet location is not always the best technical location. Air distribution, height, obstacles, and the actual use of the room must be considered.
Neglecting drainage
A poorly planned drain can lead to water problems, especially when the system operates for a long time in cooling mode during humid periods of the Montreal summer.
Underestimating the importance of commissioning
Even an excellent machine can perform poorly if it is not installed, tested, and adjusted correctly.
Why choose AirGreen for an HVAC installation on Nuns' Island
At AirGreen, we regularly perform installations of wall-mounted heat pumps, wall-mounted air conditioners, and mini-split systems in complex urban environments. Our experience in Montreal condos allows us to anticipate constraints that can slow down or complicate a project.
We know that customers are not just looking for a machine. They want a clean installation, a reliable result, clear service, respect for the premises, and a team capable of answering questions before, during, and after the work.
For this project on Nuns' Island, our approach was based on four priorities:
- proposing an appliance suitable for the home;
- installing the system discreetly and durably;
- ensuring optimal performance from commissioning;
- offering the client simple advice for proper use and maintenance of their appliance.
Usage Tips to Extend the Life of the GREE CHARMO R32
After installation, we explained to the client the best practices to adopt to get the best performance from their GREE CHARMO R32 wall-mounted heat pump.
Here are some important tips:
- regularly clean the indoor unit filters;
- avoid setting the temperature too low in summer;
- use dehumidification mode when humidity is high;
- keep the space around the outdoor unit clear;
- plan periodic HVAC maintenance;
- avoid turning the appliance off and on too frequently;
- monitor for any unusual changes in noise or performance.
A well-maintained system retains better performance, consumes less energy, and offers a longer lifespan.
A Relevant Solution for Montreal, Laval, Longueuil, the North Shore, and the South Shore
Even though this installation was carried out on Nuns' Island, the same type of solution can be suitable for many properties located in Montreal, Laval, Longueuil, on the North Shore, and the South Shore. The GREE CHARMO R32 model is particularly interesting for owners who want an efficient, compact, and modern solution to improve their comfort without undertaking major renovations.
Every building remains different. That's why we always recommend a professional evaluation before choosing the final model, capacity, and installation location. A good initial decision avoids problems with comfort, noise, consumption, or maintenance later on.
A Clean, Durable, and Everyday-Oriented Installation
This HVAC installation project in Nuns' Island demonstrates the importance of a comprehensive approach. Machine selection, positioning, ductwork, drainage, outdoor unit, commissioning, and client advice are all part of the final result.
The GREE CHARMO R32 wall-mounted heat pump installed by AirGreen now offers the client more stable comfort, efficient air conditioning, and a practical auxiliary heating solution for cooler periods. All of this was carried out with particular attention to discretion, compliance, and performance.
For condo and home owners in the greater Montreal area, this type of installation is an excellent way to improve indoor comfort while benefiting from modern technology well-suited to current residential needs.
How it goes, from the first call to the end
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.
And 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.
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.
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What people ask us about this kind of work
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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).