Installation of a GREE LIVO R32 wall-mounted heat pump in Pierrefonds-Roxboro: mini split air conditioner installed on a flat roof for reliable residential comfort
AirGreen installs a GREE LIVO R32 wall-mounted heat pump in Pierrefonds-Roxboro: mini split on a flat roof, stable support, neat piping, and reliable HVAC 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 outdoor roof installation that demands precision, stability, and attention to detail
In Pierrefonds-Roxboro, our AirGreen team carried out the installation of a GREE LIVO R32 wall-mounted heat pump, a mini split air conditioning system designed to improve indoor comfort while fitting into a very common reality in West Montreal: flat roof installations. The project photo clearly shows the GREE outdoor unit installed on an elevated metal base, placed above wooden beams, in a typical urban roof environment with gravel, parapet, brick chimney, existing ducts, and nearby mechanical equipment.
This type of project requires much more than just installing the device. On a roof, every element counts: the height of the support, wind stability, distance from obstacles, routing of refrigerant lines, cable protection, access for HVAC maintenance, drainage, vibration, noise, and the safety of technicians during installation as well as future visits.
In this case, the choice of a GREE LIVO R32 was particularly suited to the client's request: to obtain an efficient air conditioning solution in summer while benefiting from a wall-mounted heat pump capable of providing supplemental heating during cooler periods. For a residence in Pierrefonds-Roxboro, where houses and plexes can present varied architectural constraints, a well-installed wall mini split remains a flexible, efficient, and less invasive solution than a central ducted system.
A typical installation context in West Montreal
Pierrefonds-Roxboro presents an interesting mix of properties: single-family homes, duplexes, triplexes, buildings with extensions, flat roofs, mature residential areas, and alleys or side accesses that are sometimes limited. In this project, installing the outdoor unit on the roof allowed freeing up ground space, preserving the facade's appearance, and positioning the equipment in a coherent technical area.
In the photo, the outdoor unit is placed near a roof parapet and close to a mechanical box. This configuration requires a precise site assessment. It is necessary to avoid the air discharged by the device being blocked by an obstacle, vibrations being transmitted to the structure, or the lines being left without adequate protection. The raised base also helps keep the unit above the gravel surface, which improves stability and facilitates drainage around the device.
At AirGreen, we regularly encounter this kind of challenge in the Montréal, Laval, Longueuil sectors, on the North Shore and the South Shore, but the flat roofs of the west island require special attention. The available space is often shared with chimneys, ventilation outlets, electrical conduits, parapets, and sometimes other existing equipment. A successful HVAC installation therefore consists of integrating the heat pump into this environment without creating future problems.
Why the GREE LIVO R32 is well suited for this type of project
The GREE LIVO R32 is a wall-mounted heat pump of the mini split type, designed to offer an efficient heating and air conditioning solution in residential spaces. Its indoor wall-mounted format allows targeting a specific area without ductwork, while its compact outdoor unit facilitates installation on a roof, on a wall bracket, or on the ground, depending on the building configuration.
The refrigerant R32 is one of the important technical elements of this generation of equipment. It allows manufacturers to offer modern, efficient systems better suited to current requirements. For the customer, the benefit is mainly a device capable of meeting comfort needs with controlled consumption, provided that the BTU capacity is correctly selected and the installation is carried out according to best practices.
In this project in Pierrefonds-Roxboro, the exact capacity of the machine was determined according to the area to be cooled and heated, the interior layout, insulation, sun exposure, and air circulation. This is a key point: a unit that is too small will run too long, while a unit that is too large can cause short cycles, less stable comfort, and less effective dehumidification in summer.
The outdoor support: a central element of durability
The outdoor unit visible in the photo rests on a metal support installed on a wooden base. This solution is often preferred on flat roofs because it allows the unit to be kept at a practical height and reduces direct contact with the membrane or gravel. The support plays several important roles:
- keep the outdoor unit perfectly stable;
- facilitate access under the unit for inspection;
- limit debris accumulation around the base;
- protect the equipment against stagnant moisture;
- allow better management of snow and ice;
- reduce risks related to vibrations;
- ensure adequate clearance for air circulation.
A common mistake is underestimating the importance of the support. Yet, an outdoor unit installed on an unstable base can become noisy, shift slightly over time, put tension on the pipes, or complicate maintenance. On a roof, this problem is even more serious because access is less straightforward than at ground level.
In this project, our team paid special attention to the stability of the mounting, the orientation of the unit, and the routing of the pipes. The result is a clean, aligned installation, easy to locate for maintenance, and suited to the typical conditions of a residential roof in Pierrefonds-Roxboro.
Managing pipes and wiring on the roof
The photo also shows the routing of lines and cables on the roof. This technical aspect is crucial. The refrigerant lines of a heat pump must be protected, insulated, and installed in a way that avoids mechanical stress. The wiring must also be secured, well connected, and placed to reduce unnecessary exposure to physical damage.
On a flat roof, pipes can be exposed to sun, frost, snow, rain, wind, and interventions from other trades. A durable installation must therefore provide:
Adequate mechanical protection
Pipes must not be left vulnerable to impacts or movement. Even a small shock can damage the insulation or create stress on the joints.
Careful insulation
Poor insulation on refrigerant lines can harm system performance and cause unwanted condensation.
A logical path
The routing must be as direct as possible while respecting the building's constraints. The goal is not only to achieve a functional installation on the day but also a system that is easy to inspect and maintain for many years.
A clean finish
Even on a roof, the finish matters. Messy wiring or poorly positioned pipes can indicate a rushed installation. At AirGreen, we believe the outdoor part deserves the same care as the indoor unit.
Commissioning and checks after installation
Once the GREE outdoor unit is installed and connected to the indoor unit, our team carries out a series of checks. This step is an integral part of a professional HVAC installation. It confirms that the system operates correctly, that the connections are reliable, that the operating parameters are consistent, and that the client can use the device with full confidence.
The checks include notably:
- control of outdoor unit positioning;
- inspection of refrigerant connections;
- checking condensation drainage;
- validation of electrical power supply;
- testing of air conditioning and heating modes;
- verification of communication between units;
- indoor airflow control;
- basic usage explanation to the client;
- HVAC maintenance recommendations.
This last point is essential. A wall-mounted heat pump offers excellent comfort, but it must be maintained. The indoor unit filters need to be cleaned regularly, the outdoor unit must remain clear, and periodic professional maintenance helps preserve the system's performance.
A mini split solution adapted to the realities of flat roofs in Pierrefonds-Roxboro
This installation in Pierrefonds-Roxboro perfectly illustrates the advantage of a GREE LIVO R32 system in a building where floor space or exterior aesthetics may limit options. By installing the outdoor unit on the roof, we were able to offer a discreet, practical, and consistent solution with the existing structure.
Indoor comfort: air conditioning, auxiliary heating, and zone control
The main advantage of a mini split wall air conditioner is its ability to treat a specific area of the house. Unlike a central system, which distributes air through ducts throughout the home, a wall-mounted heat pump targets a specific room or open area. This allows the customer to better control their comfort, especially in rooms that become too hot in summer or are less well served by existing heating.
In Pierrefonds-Roxboro, this kind of solution is often sought for:
- open living rooms;
- upper floors that accumulate heat;
- extensions;
- homes with electric heating;
- home offices;
- rooms located under a roof;
- spaces where adding ducts would be too costly.
A well-sized wall-mounted heat pump can significantly improve temperature stability. In summer, it also helps reduce humidity, which greatly changes the comfort feeling. In mid-season, it can provide efficient heating without immediately starting the main system.
Specifics of flat roof installation
Installing an outdoor unit on a flat roof has advantages but also specific requirements. The main advantage is discretion: the device does not take up ground space, does not obstruct outdoor passages, and can be positioned in a technical area already designed for this type of equipment. However, the roof imposes its own rules.
Preserve the membrane and structure
Even if the unit rests on a support and bases, the roofing membrane, drainage, and load must always be considered. Poorly planned installation can create pressure points or complicate water flow.
Plan for future access
A technician must be able to access the unit for inspection, cleaning, diagnosis, or repair. The unit should not be stuck in a dangerous place or too close to an obstacle.
Respect clearances
Air circulation around the outdoor unit is essential. If the warm air expelled in cooling mode is blocked or recirculated by the device, performance decreases. The unit may then have to work harder and consume more.
Reducing vibrations
A roof can transmit certain noises or vibrations inside the building. The choice of support, the quality of anchoring, and positioning help to limit these effects.
Subsidies and eligibility: what customers need to know
In Quebec, some wall-mounted heat pumps may be eligible for subsidy programs when technical criteria are met. Eligibility depends on the exact model, BTU capacity, applicable certifications, the combination of the indoor and outdoor units, as well as the program rules in effect at the time of installation.
For a GREE LIVO R32, it is therefore important to validate the information specific to the installed configuration. At AirGreen, we help our clients gather the necessary documents, including model numbers, detailed invoices, and technical information. This process avoids common mistakes, such as choosing a device assuming it is automatically eligible or forgetting to keep the necessary proof after the work.
Practical advice before installing a wall-mounted heat pump on a roof
Owners considering an installation like the one in Pierrefonds-Roxboro should pay attention to several elements before choosing their device and contractor.
Have the outdoor location evaluated
A flat roof is not automatically a good location. Access, structure, clearances, presence of other equipment, and risks related to snow or water accumulation must be analyzed.
Do not choose the machine based only on price
The initial cost does not always reflect the installation quality. A cheaper system, poorly positioned or installed with inadequate supports, can lead to additional costs in the medium term.
Demand a clean installation of the lines
The refrigerant lines, wiring, and drain are part of the system. Their installation quality directly affects the overall reliability.
Think about maintenance from the start
An inaccessible device or one placed in a difficult area can make maintenance more expensive. A good installer thinks about future maintenance from the first visit.
Validate the capacity in BTU
The right capacity depends on several factors. A serious assessment must consider the room, insulation, windows, orientation, number of occupants, and actual use of the space.
The AirGreen approach: a project adapted to the building, not just the device
This project in Pierrefonds-Roxboro clearly shows our approach. We do not treat an HVAC installation as just an equipment delivery. We analyze the building, the physical constraints, the client's expectations, and how the system will be used daily.
In Greater Montreal, we have installed similar systems in very varied contexts: outdoor units on condo balconies in Montreal, wall mounts on plexiglass in Longueuil, ground bases on properties in Laval, discreet installations on the North Shore, and complex residential projects on the South Shore. Each configuration requires adjustments. What works perfectly for a single-family home does not necessarily suit a flat-roofed building or a property with restricted access.
For the GREE LIVO R32 installed here, the desired result was simple: to offer reliable comfort, with a well-stabilized, accessible outdoor unit integrated into the roof environment. The work visible in the photo reflects particular attention to the support, the orientation of the unit, and respect for space constraints.
An installation that protects long-term performance
A wall-mounted heat pump system is an investment. Its performance does not depend solely on the brand or the technical sheet. It strongly depends on the quality of the installation: connections, vacuum, drainage, support, clearances, pipe insulation, commissioning, and advice given to the client.
In this project, the rooftop installation allows the outdoor unit to operate in an open space while maintaining a discreet solution for the building. For the client, this means better management of indoor comfort, a clean outdoor installation, and a solution adapted to the realities of Pierrefonds-Roxboro.
At AirGreen, we place great importance on the details that are not always visible at first glance. A well-laid base, well-protected piping, a properly oriented unit, and well-thought-out maintenance access can make a big difference after several Quebec winters and summers. It is this rigor that allows our installations to remain reliable and efficient, whether in Montreal, Laval, Longueuil, on the North Shore or the South Shore.
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.
What the unit delivers when it is cold
The range as published on airgreen.ca: pick a size to see its capacity in deep cold.
| Size | Heating at −8 °C | Heating at −15 °C | Coldest certified point | COP at −15 °C | SEER | HSPF | Indicative LogisVert aid |
|---|---|---|---|---|---|---|---|
| Gree Livo R32 9 000 (115 V) | 10,000 | 7,600 | −25 °C: 5,700 | 1.86 | 20.5 | 8.8 | – |
| Gree Livo R32 9 000 | 9,600 | 7,600 | −25 °C: 5,500 | 1.94 | 20.5 | 8.8 | – |
| Gree Livo R32 12 000 (115 V) | 9,700 | 8,500 | −25 °C: 6,500 | 1.75 | 19.0 | 8.5 | – |
| Gree Livo R32 12 000 | 9,700 | 9,100 | −25 °C: 6,500 | 1.8 | 19.0 | 8.5 | $1,164 |
| Gree Livo R32 18 000 | 15,300 | 12,100 | −25 °C: 10,200 | 1.85 | 20.0 | 8.5 | $1,836 |
| Gree Livo R32 24 000 | 19,200 | 15,700 | −25 °C: 10,500 | 1.75 | 19.0 | 8.5 | $2,304 |
| Gree Livo R32 30 000 | 24,000 | 23,000 | −25 °C: 16,900 | 1.8 | 22.0 | 9.0 | $2,880 |
| Gree Livo R32 36 000 | 27,400 | 24,600 | −25 °C: 21,000 | 1.8 | 21.0 | 8.5 | $3,288 |
According to NEEP, it delivers 10,000 BTU/h at −8 °C (17 °F), as much as at 8 °C. It heats as hard in moderate cold as in mild weather.
According to NEEP, its certified maximum capacity at −25 °C (−13 °F) is 5,700 BTU/h, 63% of its nominal 9,000 BTU size.
At 8 °C, its certified maximum capacity reaches 13,300 BTU/h, 48% more than its nominal 9,000 BTU size.
According to NEEP, its COP at −15 °C is 1.94: the highest of the Livo R32 line, which ranges from 1.75 to 1.86 at that temperature.
According to NEEP, its certified maximum capacity at −25 °C (−13 °F) is 5,500 BTU/h, 61% of its nominal 9,000 BTU size.
At 8 °C, its certified maximum capacity reaches 13,136 BTU/h, 46% more than its nominal 9,000 BTU size.
According to NEEP, it delivers 8,500 BTU/h at −15 °C, against 9,100 for the Gree Livo R32 12 000.
At −25 °C, its certified minimum capacity is 1,800 BTU/h (3,070 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 8,500 BTU/h, 71% of its nominal 12,000 BTU size. Its COP there is 1.75.
According to NEEP, it delivers 9,100 BTU/h at −15 °C, against 8,500 for the Gree Livo R32 12 000 (115 V).
At −25 °C, its certified minimum capacity is 1,800 BTU/h (3,070 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 9,100 BTU/h, 76% of its nominal 12,000 BTU size. Its COP there is 1.80.
At 8 °C, its certified maximum capacity reaches 22,500 BTU/h, 25% more than its nominal 18,000 BTU size.
According to NEEP, its certified minimum capacity is at least 7,000 BTU/h at every temperature. In a small, well-insulated room it will cycle on and off more often: size it carefully.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 12,100 BTU/h, 67% of its nominal 18,000 BTU size. Its COP there is 1.85.
At −25 °C, its certified minimum capacity is 3,100 BTU/h (5,800 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 15,700 BTU/h, 65% of its nominal 24,000 BTU size. Its COP there is 1.75.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 23,000 BTU/h, 77% of its nominal 30,000 BTU size. Its COP there is 1.80.
According to NEEP, its COP at −25 °C is 1.54: the highest of the Livo R32 line, which ranges from 1.30 to 1.52 at that temperature.
At −25 °C, its certified minimum capacity is 7,000 BTU/h (10,000 at 8 °C). It slows down instead of cycling on and off.
According to NEEP, its certified heating capacity at −15 °C (5 °F) is 24,600 BTU/h, 68% of its nominal 36,000 BTU size. Its COP there is 1.80.
Data read live from the airgreen.ca page of each size (NEEP / AHRI certified performance). When the title names the installed size, it is highlighted; otherwise the whole range is shown. The aid shown is today’s, using Hydro-Québec’s rule ($120 per 1,000 BTU/h at −8 °C); amounts quoted in the article date from its publication. Only Hydro-Québec confirms the assistance granted.A dash in the aid column: amount to be confirmed for this model.
And at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Baseboards and electric furnaces turn 1 kWh of electricity into 1 kWh of heat. A heat pump delivers more: that is its COP. At Hydro-Québec’s rate D (11.142¢/kWh above 40 kWh a day, since 1 April 2026):
Hydro-Québec: a heat pump can be up to three times more efficient than baseboards for heating in the colder months.
Estimate per kWh of heat, at the chosen temperature, using the certified COP from the product page. Taxes, access charge and backup heat not included.
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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Wall-mounted or multi-zone: how do I choose?
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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).