Installation of a GREE CHARMO R32 wall-mounted heat pump in Sainte-Julie – High-performance Mini Split HVAC
Discover an HVAC installation in Sainte-Julie with a GREE CHARMO R32 wall-mounted heat pump. A high-performance mini-split solution installed by AirGreen for optimal comfort on the South Shore.
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.
Strategic Installation in a Confined Space for Optimal Comfort
At AirGreen, every HVAC installation project presents its unique challenges. This installation, carried out in Sainte-Julie on the South Shore, perfectly illustrates our ability to adapt our methods to the real constraints of a residential building. The task involved installing a GREE CHARMO R32 wall-mounted heat pump, a mini-split known for its energy efficiency and reliability, in a delicate space located above an interior staircase.
Upon arrival, we observed that the indoor unit needed to be positioned high up, on a wall adjacent to a stairwell. This configuration demanded a rigorous technical approach to ensure both the safety of our team and a perfectly aligned, stable, and durable installation.
Accessibility Challenge Mastered with Precision
The installation image clearly shows the complexity of the positioning. The indoor unit is installed above a stair railing, which significantly limits direct access to the wall. To overcome this obstacle, our team used a precisely adjusted professional ladder, while also setting up temporary protection to prevent any damage to the surrounding surfaces.
We also added a protective wall bracket under the unit during installation to stabilize the equipment and ensure perfect alignment during fastening. This type of detail makes all the difference between a standard installation and work executed according to the highest professional standards.
Positioning Choice: Performance and Air Distribution
The location of the wall-mounted heat pump was not chosen at random. By installing it in this strategic area, we optimized air circulation between floors. Warm air in winter and cool air in summer can thus circulate naturally in the stairwell, improving the overall thermal comfort of the house.
This type of configuration is particularly effective in open-concept homes or those with significant vertical volumes. Our expertise in HVAC in Montreal, Laval, Longueuil, and on the South Shore allows us to recommend the most efficient locations based on the building's structure.
The GREE CHARMO R32: Performance, Efficiency, and Modernity
Technology with R32 Refrigerant
The GREE CHARMO R32 uses a modern refrigerant, R32, known for its low environmental impact compared to previous generations. This technological choice allows for:
- Better energy efficiency
- Reduced greenhouse gas emissions
- Increased heating performance even at low temperatures
This type of system is particularly well-suited to the Quebec climate, where winters demand reliable and consistent performance.
Capacity and Energy Efficiency
Depending on the configuration chosen for this installation in Sainte-Julie, this unit can offer a capacity generally ranging around:
- 9,000 to 18,000 BTU (depending on specific client needs)
- An excellent Coefficient of Performance (COP) in heating mode
- A high SEER rating for efficient cooling in summer
At AirGreen, we always take care to precisely size each system to avoid common errors such as oversizing or undersizing, which can negatively impact performance and equipment lifespan.
Noise Level and Comfort
Another notable advantage of the GREE CHARMO R32 is its quiet operation. In an installation like this, located near a traffic area (stairs), it is essential that the appliance does not generate noise pollution. This model offers a very low noise level, ensuring optimal comfort for occupants.
Full Installation Process
Step 1: Analysis and Preparation
Before any installation, our team performs a complete analysis:
- Wall structure assessment
- Verification of access for installation
- Determination of the best location for the outdoor unit
- Planning of refrigerant line routing
In this project, the main difficulty was high access above the staircase, which required meticulous preparation.
Step 2: Indoor Unit Installation
The installation of the indoor unit was carried out with millimeter precision:
- Fixing of the solid wall bracket
- Level check to ensure perfect horizontality
- Installation of conduits and drainage
As seen in the image, we used specialized equipment to ensure stability throughout the intervention.
Step 3: Connection and Commissioning
Once the indoor unit was in place, we proceeded with:
- Connection of the refrigerant lines
- Installation of the outdoor unit
- System vacuuming
- Comprehensive functional testing
Every installation carried out by AirGreen includes a full verification to ensure that the system operates at its full potential from day one.
Common Errors Avoided in This Project
In this type of installation, several errors can compromise system performance:
- Incorrect indoor unit positioning
- Inadequate fastening in a hard-to-reach wall
- Poor drainage management
- Lack of protection for surrounding surfaces
Thanks to our experience in wall-mounted heat pump installation in Montreal, Laval, and Longueuil, we were able to avoid these pitfalls and deliver a clean, durable, and efficient installation.
Customer Experience and Satisfaction
The client in Sainte-Julie was looking for an effective solution to improve their home's thermal comfort without undertaking major renovations. The GREE CHARMO R32 wall-mounted heat pump proved to be the ideal choice.
After the installation, the client immediately noticed:
- Better temperature distribution
- Increased comfort in areas previously difficult to heat/cool
- Potential reduction in energy costs
At AirGreen, we place great importance on the customer experience, from the first consultation to the final commissioning.
Why Choose AirGreen for Your HVAC Installation
Our expertise in HVAC on the South Shore, in Montreal, Laval, and Longueuil sets us apart through:
- A personalized approach for each project
- Advanced technical mastery
- Attention to detail in every installation
- Total transparency with our clients
Every installation is carried out as if it were for our own home.
Practical Advice for Future Projects
If you are considering installing a mini-split or a wall-mounted heat pump, here are some recommendations:
- Always have your space evaluated by a professional
- Do not choose the location solely for aesthetic reasons
- Check eligibility for available subsidies in Quebec
- Prefer recognized brands like GREE
We support our clients at every step, including procedures related to financial assistance programs when available.
Conclusion
This installation in Sainte-Julie clearly demonstrates that a well-executed project relies on a combination of technical expertise, adaptation to constraints, and the choice of quality equipment. The GREE CHARMO R32 stands out as a reliable and high-performing solution for Quebec residences.
At AirGreen, we continue to offer custom HVAC installations, adapted to the realities of each home, with a constant focus on performance and durability.
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
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
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The outdoor unit is covered in ice: is that normal?
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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).