Installation of a GREE CROSSOVER R32 Wall-Mounted Heat Pump in Saint-François: a high-performance Mini Split solution installed on a flat roof
AirGreen installs a GREE CROSSOVER R32 wall-mounted heat pump in Saint-François: Mini Split system on the roof, meticulous finish, efficient comfort, and local HVAC expertise.
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.
An HVAC Installation Designed for Comfort, Discretion, and Durability in Saint-François
In Saint-François, in eastern Laval, AirGreen recently completed the installation of a GREE CROSSOVER R32 wall-mounted heat pump, a Mini Split system designed to offer an excellent balance between energy efficiency, seasonal comfort, and neat integration into the building. The project involved a particularly interesting configuration: the outdoor unit had to be installed on a flat roof, with adequate clearance, a stable structure, and rigorous protection of the refrigerant and electrical connections.
Upon our arrival at the site, one thing was clear: this installation had to be carried out with particular attention to the stability of the outdoor unit. In the project photo, one can clearly see the GREE unit placed on a support structure adapted to the roof, with a raised base allowing the appliance to be clear of the membrane and promoting good air circulation around the condenser. This type of mounting is essential for a reliable HVAC installation, especially in a region like Saint-François, where freeze-thaw cycles, wind, and snow accumulation can challenge a poorly prepared installation.
At AirGreen, we know that a wall-mounted heat pump is more than just its performance on paper. The quality of the installation directly influences the level of comfort, energy consumption, compressor lifespan, drainage, noise, ease of maintenance, and even the final appearance of the project. That's why every detail matters: location, supports, clearance distances, line protection, pipe routing, sealing around penetrations, and commissioning.
Why the GREE CROSSOVER R32 was the right choice for this project
The GREE CROSSOVER R32 model is a highly valued solution for homeowners looking to combine heating and air conditioning in a single compact system. For this installation in Saint-François, the client sought an efficient solution to improve indoor comfort without resorting to a more invasive central system. The property's configuration allowed for the installation of a wall-mounted air conditioner of the Mini Split type, with an outdoor unit positioned on the roof to preserve ground space and limit visual impact around the building.
The R32 refrigerant also represents a significant asset. Compared to older refrigerants used in several previous generations of equipment, R32 is recognized for its better environmental profile and thermal transfer efficiency. For a homeowner in Laval, Montreal, Longueuil, the North Shore, or the South Shore, this choice is part of a practical logic: to acquire a modern, high-performance appliance, well-suited to Quebec's residential needs and compatible with current HVAC market requirements.
A Mini Split system adapted to the building's actual needs
Before proceeding with an installation, we always evaluate several aspects:
- the area to be treated;
- the building's orientation;
- existing insulation;
- ceiling heights;
- internal heat sources;
- sun exposure;
- occupants' usage habits;
- installation constraints for the outdoor unit;
- the best location for the indoor wall unit.
In this project, the GREE CROSSOVER R32 solution met the primary need: to provide stable cooling comfort during summer and efficient auxiliary heating during cold periods, while maintaining a clean, accessible, and durable installation.
A rooftop-installed outdoor unit: technical points not to be overlooked
Rooftop installation requires a different method than ground-level installation. The photo shows an outdoor unit mounted on a wood and aluminum structure, with clearance beneath the unit. This configuration offers several advantages when executed properly:
- it protects the unit from water accumulation;
- it limits the risk of direct contact with the roofing membrane;
- it facilitates ventilation around the condenser;
- it allows for more practical access for certain HVAC maintenance tasks;
- it reduces clutter at ground level;
- it can improve visual integration in certain residential or multi-unit contexts.
However, this type of installation demands great precision. The structure must not damage the roof, the unit must remain perfectly stable, vibrations must be controlled, and the refrigerant lines must be protected against the elements. We also pay particular attention to the unit's weight, load distribution, and exact placement to avoid any sensitive areas of the roof.
Meticulous Execution: From Roof Preparation to System Startup
Location Analysis and Support Preparation
The first step of the project involved validating the outdoor unit's location. On a flat roof, it's crucial to avoid areas where water can accumulate, maintain sufficient distance from edges, respect required clearances around the appliance, and ensure safe access for technicians.
In this installation in Saint-François, we chose a position that allows the GREE outdoor unit to breathe correctly, while maintaining an efficient path for the refrigerant lines. The support was prepared so that the appliance remains stable, level, and well-elevated. The unit's feet are fixed on a structure that absorbs stresses better than a simple direct placement on the roof.
This step is often underestimated. Yet, a poorly positioned outdoor unit can generate several problems: vibration, noise, premature wear, ice accumulation, inefficient drainage, difficult access for maintenance, or reduced performance due to lack of air circulation.
Routing and Protection of Refrigerant Lines
In the photo, you can see the black conduits extending from the outdoor unit, as well as a protected connection section. These lines are a critical part of the installation. They must be properly insulated, securely fastened, and protected against UV rays, wind, friction, ice, and temperature variations.
For a wall-mounted heat pump like the GREE CROSSOVER R32, poor line insulation can lead to efficiency losses, undesirable condensation, or premature wear of certain components. We therefore took care to maintain a clean, compact, and accessible route, avoiding excessive bends and unnecessary tension on the fittings.
Electrical Connection and Compliance
The installation of a wall-mounted air conditioner or a Mini Split heat pump should never be improvised. The electrical connection must be compliant, safe, and adapted to the appliance's capacity. In this project, the goal was to deliver a system ready to operate under stable conditions, with adequate power supply, appropriate protections, and a professional finish.
At AirGreen, our installations are carried out by experienced teams who understand both the demands of the field and the applicable standards in Quebec. This expertise is particularly important when the outdoor unit is on a roof, as access, cable routing, and connection protection must be meticulously planned.
Vacuuming, Checks, and Startup
Once the mechanical and electrical connections are complete, we proceed with the essential commissioning steps. These include leak testing, vacuuming the lines, checking connections, and then starting the appliance. These steps are crucial for the longevity of the compressor and the performance of the system.
A high-end or well-designed appliance can deliver disappointing results if poorly installed. Conversely, a rigorous installation allows a GREE CROSSOVER R32 heat pump to operate under good conditions from day one.
Final Result: A Clean, Stable, and Discreet Installation
The result achieved in Saint-François is exactly what we aim for in this type of project: a solidly installed outdoor unit, well-organized line routing, a stable base, good ventilation, and a finish that respects the building's appearance.
The client now benefits from a Mini Split system capable of improving indoor comfort while avoiding an invasive installation. The choice of a rooftop installation also preserves outdoor ground space, a significant advantage when the landscaping around the building is limited or when one wishes to keep a clear yard.
Common Mistakes to Avoid When Installing a Wall-Mounted Heat Pump on a Roof
Placing the unit directly on the membrane
One of the most serious mistakes is to place the outdoor unit directly on the roof membrane. This can cause pressure points, wear, leaks, or problems during freeze-thaw cycles. An appropriate base helps distribute the load and protect the roof.
Neglecting air circulation around the condenser
An outdoor unit needs to breathe. If it is too close to a wall, a parapet, an obstruction, or other equipment, performance can decrease. The compressor may work harder, consume more energy, and wear out faster. In this installation, the location was chosen to promote adequate air circulation.
Poorly protecting refrigerant lines
Lines exposed to sun, wind, or friction must be carefully protected. Damaged insulation can lead to efficiency losses and condensation. A clean installation is not just about appearance: it protects the system's performance.
Underestimating the importance of levelness
A tilted outdoor unit can lead to vibrations, noise, and drainage problems. On a flat roof, the level must be checked carefully, as the surface may have slight slopes for water drainage.
Choosing a capacity without serious analysis
A wall-mounted air conditioner that is too small will run constantly without achieving the desired comfort. An appliance that is too large can cause short cycling, poorer dehumidification, and increased wear. The choice of the right model should always be based on a building analysis, and not solely on approximate square footage.
What this project demonstrates about the AirGreen approach
An installation adapted to the building, not a copy-paste solution
Every property in Saint-François, Montreal, Laval, Longueuil, on the North Shore or on the South Shore has its own constraints. A flat roof, a brick wall, a condo, a townhouse, a duplex, or a commercial space requires different methods. Our job is to adapt the HVAC solution to the actual building, with its constraints, access points, materials, and comfort needs.
In this project, rooftop installation was the best option. It allowed for a discreet finish, good technical accessibility, and efficient integration of the outdoor unit. We therefore designed the installation around this reality, instead of imposing a standard method.
Particular attention to durability
The durability of an HVAC system depends as much on the choice of equipment as on the quality of the installation. A solid support, well-executed connections, protected insulation, rigorous vacuuming, and complete commissioning make a real difference in the long run.
The GREE CROSSOVER R32 installed here benefits from a sound foundation to operate efficiently. This rigor is particularly important with modern heat pumps featuring inverter technology, which modulate their operation according to demand. For this modulation to be optimal, the appliance must be installed under good conditions.
A clear and professional client experience
Our clients want to understand what will be installed, why this location is chosen, how the work will proceed, and what benefits they can expect. We take the time to explain the options, constraints, and technical choices. This transparency is an essential part of our service.
In this project, the client could concretely see the importance of a clean rooftop installation: the outdoor unit is well-clear, the conduits are organized, the support structure is stable, and the entire setup remains accessible for future checks.
Practical Advice for Saint-François Homeowners Considering a Wall-Mounted Heat Pump
Have the location evaluated before choosing the model
The choice of a system should not be based solely on a technical sheet. The location of both the indoor and outdoor units strongly influences the result. In some cases, a ground-level installation is ideal. In others, like here, a rooftop installation is more logical.
Plan for maintenance from the start of installation
A good installation facilitates HVAC maintenance. The unit must remain accessible for cleaning, inspections, electrical checks, and performance controls. On a roof, this access must be considered from the outset to avoid complicated interventions later on.
Protecting the investment with professional installation
A wall-mounted heat pump represents a significant investment. Professional installation protects this investment. It reduces the risks of leaks, vibrations, excessive noise, poor performance, or premature breakdown.
Check for available subsidies
Depending on the exact model, its capacity, efficiency, and current programs, some installations may be eligible for energy subsidies. Criteria can vary, and it's important to verify the eligibility of the installed model before making a final decision. At AirGreen, we regularly assist our clients in understanding the available programs for eligible heat pump systems.
AirGreen: Local HVAC Installation Expertise in Saint-François, Laval, and Throughout Greater Montreal
This installation of a GREE CROSSOVER R32 wall-mounted heat pump in Saint-François perfectly illustrates our approach: offering a tailored solution, installing with precision, and delivering a lasting result. The rooftop outdoor unit, well-positioned and solidly supported, reflects the kind of details that differentiate an ordinary installation from a truly professional one.
AirGreen regularly operates in Laval, Montreal, Longueuil, on the North Shore and South Shore for residential and commercial projects including air conditioning, heating, wall-mounted heat pumps, wall-mounted air conditioners, Mini Split systems, and HVAC maintenance. Our team is adept at navigating local realities: flat roofs, condos, semi-detached houses, multiplex buildings, restricted access, co-ownership requirements, electrical constraints, and specific comfort needs.
For this project in Saint-François, the final result is clean, stable, efficient, and consistent with the client's needs. The GREE CROSSOVER R32 now offers a modern indoor comfort solution, while the rooftop installation helps preserve ground space and maintain a discreet appearance.
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).