Installation of a GREE CHARMO R32 Mini Split Wall-Mounted Heat Pump in Saint-Constant
In Saint-Constant, AirGreen carried out the neat installation of a GREE CHARMO R32 12,000 BTU wall-mounted heat pump. A compact, quiet, and efficient HVAC solution for optimal comfort all year round.
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A discreet and perfectly integrated HVAC installation in this Saint-Constant residence
At AirGreen, we know that a wall-mounted heat pump installation should never compromise a home's interior aesthetics. In this residence located in Saint-Constant on the South Shore of Montreal, our team installed a GREE CHARMO R32 Mini Split with a very specific goal: to provide efficient thermal comfort while respecting the architectural style of the living room.
Upon our arrival, we noticed that the main wall had several important decorative elements: thick mouldings, wall panelling, limited ceiling height, and a central space very visible from the house entrance. A standard installation would have quickly resulted in a visually unbalanced outcome.
We therefore proposed precise wall positioning to optimize:
- air diffusion in the main space;
- the discretion of the unit;
- accessibility for HVAC maintenance;
- the necessary clearance around the indoor unit;
- harmony with existing mouldings.
The final result is particularly clean. The white unit of the GREE CHARMO R32 blends naturally into the light decor of the room, without attracting unnecessary attention. On this installation, every detail mattered: alignment with the mouldings, management of refrigerant lines, condensation drain slope, and maximum reduction of visual impact.
Why the client chose the GREE CHARMO R32
The owner was looking for a solution capable of replacing an old, inefficient, and noisy air conditioning system. After analyzing the building's actual needs, we recommended a 12,000 BTU GREE CHARMO R32 wall-mounted heat pump, perfectly suited to the open floor plan of the ground floor.
This series is currently attracting a lot of attention in the HVAC sector in Montreal and on the South Shore, notably due to its balance of performance, price, and low energy consumption.
Among the elements that convinced the client:
- quiet operation;
- compact design;
- Inverter technology;
- integrated Wi-Fi connectivity;
- more efficient R32 refrigerant;
- efficient heating even during cold periods;
- simplified maintenance.
The CHARMO R32 series boasts an efficiency of up to 20 SEER2 and approximately 8.8 HSPF2 depending on configurations. It can also operate in heating mode down to approximately -13 °F (-25 °C).
A unit adapted to Quebec's climatic realities
In Saint-Constant, as everywhere on the South Shore, temperature variations are significant between winter and summer. We therefore prioritize devices capable of maintaining real thermal stability without causing constant start-up cycles.
GREE's Inverter technology precisely modulates power according to the building's actual needs. This provides several advantages:
- reduced electricity consumption;
- more stable temperature;
- less noise;
- longer compressor lifespan;
- more uniform comfort.
In this house, the goal was not simply to cool the space during the summer. The client also wanted to reduce their reliance on electric heating during intermediate seasons.
The GREE CHARMO R32 heat pump responds very well to this need, particularly in residential areas of Saint-Constant, Brossard, Longueuil, Laval, and Montreal, where open-plan homes require good air circulation.
Technical challenges encountered during installation
Even if the installation seems simple once completed, several technical challenges had to be overcome.
1. Management of decorative mouldings
The top of the wall had thick mouldings, limiting the space available between the ceiling and the indoor unit. We had to take extremely precise measurements to ensure:
- compliance with manufacturer's clearances;
- adequate filter access;
- optimal air circulation;
- a uniform aesthetic finish.
A few too many inches upwards would have negatively impacted the unit's performance.
2. Passage of refrigerant lines
The passage of the conduits had to remain invisible from the main living room area. We therefore chose a carefully concealed lateral path to avoid a cluttered appearance.
At AirGreen, we place great emphasis on this aspect. A successful HVAC installation does not depend solely on the chosen machine. The visual and mechanical quality of the installation plays a major role in long-term satisfaction.
3. Vibration control
In many South Shore homes, certain interior partitions easily transmit mechanical vibrations. We therefore used supports and fastening techniques to minimize:
- vibrations;
- resonances;
- structural noise.
The client wanted a discreet unit during the night and quiet times of the day. The result perfectly meets this expectation.
How this GREE CHARMO R32 installation concretely changes daily comfort
After commissioning, the difference in the house was immediate.
Rapid and uniform cooling
The main living room receives a lot of natural light. During hot summer days in Saint-Constant, the indoor temperature quickly became uncomfortable.
Thanks to the system's cooling capacity, fresh air is now distributed uniformly throughout the open space. The Turbo mode also allows for rapid temperature reduction after a hot day.
Very low noise level
This is often one of the first comments we receive after an installation of this range.
The GREE CHARMO R32 operates with a particularly low indoor noise level at reduced speeds.
In this residence, this makes a significant difference as the living room communicates directly with the main hallway and relaxation areas.
Better controlled energy consumption
Many clients on the South Shore, Laval, and Montreal are currently looking to reduce their energy costs without undertaking major renovations.
The installation of a high-efficiency wall-mounted heat pump often represents one of the best possible investments for:
- reducing winter consumption;
- improving summer comfort;
- limiting the use of electric baseboards;
- increasing the perceived value of the property.
In this specific project, we also advised the client on some simple best practices:
Advice given after installation
- regularly clean the filters;
- avoid constantly changing the temperature;
- keep interior doors open when possible;
- plan annual HVAC maintenance;
- clear the outdoor unit during winter.
These details have a real impact on long-term performance.
An installation designed to last
At AirGreen, we don't just aim to quickly install a machine. We want each system to continue functioning efficiently years later.
For this reason, we have:
- checked the system pressure after installation;
- tested the complete drain evacuation;
- validated heating performance;
- performed a complete vacuum;
- calibrated the operating parameters.
It is often these invisible steps that differentiate a professional installation from an improvised one.
Potential eligibility for energy assistance programs
Depending on the exact configuration chosen and the criteria in effect at the time of installation, certain versions of the GREE CHARMO R32 series may be eligible for specific energy efficiency programs in Quebec. We always recommend that owners check available programs before work begins to maximize potential savings.
Why AirGreen performs so many installations on the South Shore
Over the years, we have installed hundreds of HVAC systems in:
- Saint-Constant;
- Longueuil;
- Brossard;
- Laval;
- Montreal;
- the North Shore;
- the South Shore.
Our approach remains the same in every project:
- real building analysis;
- adapted recommendations;
- clean installation;
- technical transparency;
- accessible after-sales service.
This installation of a GREE CHARMO R32 wall-mounted heat pump in Saint-Constant represents exactly the type of project we appreciate: precise, aesthetic, and durable work, designed to concretely improve the daily comfort of occupants.
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).