Installation of a GREE All Match Slim Duct R32 ducted heat pump in Sainte-Thérèse – discreet Slim Duct system with outdoor unit on the rear balcony

A GREE ducted installation designed for a dense residential building in Sainte-Thérèse

In Sainte-Thérèse, on the North Shore, our AirGreen team completed a particularly interesting HVAC installation in a residential building where the available outdoor space had to be used with great precision. The project involved installing a GREE ducted heat pump, of the ducted ducts, Slim Duct, or ductable type, with an outdoor unit positioned on a rear balcony, near a metal staircase and a brick facade.

This type of installation requires more rigorous planning than a standard wall installation. Here, the GREE outdoor unit had to be installed in a stable, accessible, and safe manner, while respecting the clearances needed for air circulation. The rear balcony presented several constraints: metal guardrail, exterior staircase, restricted passage, limited concrete surface, brick facade, soffit above the unit, and close neighboring buildings. In this context, every detail matters.

The client's goal was clear: to achieve the comfort of a high-performance heat pump, with a more discreet air distribution inside than a traditional wall air conditioner. The ducted system allows the indoor unit to be hidden in a technical space, ceiling, or suitable area, then distributes air through ducts to targeted rooms. Outside, the GREE unit handles the heat exchange, while inside, the duct network becomes the key to comfort.

For this project, we chose a solution from the GREE All Match Slim Duct R32 family, a range appreciated for its discreet integration, varied capabilities, and compatibility with residential installations where interior aesthetics are as important as performance.

A demanding outdoor location: balcony, guardrail, and metal staircase

The construction photo clearly shows the reality of many HVAC installations in buildings in Sainte-Thérèse, Montreal, Laval, or Longueuil: it is not enough to place the outdoor unit “where there is space.” It must be ensured that the device breathes properly, remains accessible for service, is stable, does not obstruct circulation, and respects the building’s constraints.

In this specific case, the GREE outdoor unit was installed on an aluminum support, elevated above the balcony slab. This choice offers several concrete advantages:

• better protection against water, snow, and ground accumulation;
• clearance under the unit to facilitate drainage and inspection;
• increased stability compared to direct ground placement;
• reduction of risks related to premature corrosion;
• more convenient access for HVAC maintenance;
• More professional finish in a visible and restricted space.

The positioning of the unit also had to take the guardrail into account. The front of the device, where the fan expels air, must not be blocked. In a poorly planned installation, a guardrail too close or an obstruction in front of the unit can harm performance, increase noise, and force the compressor to work under less favorable conditions. At AirGreen, we always check these clearances before finalizing the location.

The challenge of piping in a narrow outdoor space

Another important aspect of this installation in Sainte-Thérèse involved the routing of refrigerant lines, wiring, and drainage. On the site, a protected pipe runs along the wall, with a neat layout leading to the outdoor unit. In a rear space shared with a staircase, balconies, and a brick facade, the finish must be both solid, discreet, and durable.

Our technicians worked to limit floor space usage and protect connections. The refrigerant lines of a GREE ducted heat pump must be installed according to the manufacturer's recommendations, with particular attention to lengths, bends, insulation, and leak tests. A poorly protected or routed line can cause performance losses, vibrations, or long-term service issues.

In this project, the exterior brick was also an element to handle carefully. The openings must be clean, well sealed, and adapted to the structure. A good installation is not limited to the device's operation on the day of startup; it must also protect the building envelope against water infiltration, air leaks, and premature damage.

Why a GREE ducted system rather than a classic wall unit

In several residences, a wall air conditioner or a wall heat pump remains an excellent option. However, in this project, the client wanted a more discreet integration inside. The ducted system reduces the visual presence of equipment in living spaces. The supply vents are more discreet than a wall unit, and the indoor unit can be hidden in a technical area.

This approach is particularly interesting when the client wants to:

• preserve the appearance of interior walls;
• distribute air to several nearby zones;
• get a more uniform temperature;
• reduce the visual impact of the HVAC system;
• integrate air conditioning and heating in a renovation;
• improve comfort without multiplying wall units.

The GREE All Match Slim Duct R32 range meets this type of need well thanks to its different capacities, including 9,000 BTU, 12,000 BTU, 18,000 BTU, 24,000 BTU, 30,000 BTU, and 36,000 BTU, depending on the available models. At AirGreen, we never choose a capacity based solely on an approximate area. We assess the housing layout, insulation, solar orientation, number of rooms to serve, heat losses, and the actual duct possibilities.

Low pressure or high static pressure: an essential technical choice

The GREE ducted systems offered by AirGreen include options in low static pressure and high static pressure. This detail may seem technical, but it directly influences the final result.

A low static pressure system is generally suitable for shorter, simpler duct networks when the indoor unit is close to the supply vents. A high static pressure system may be necessary when ducts are longer, more complex, or when multiple outlets need to be served with greater air resistance.

For the Sainte-Thérèse installation, our approach was to analyze the possible duct routing before confirming the best configuration. A ducted system should never be treated as just a box to connect. The ducts, grilles, air returns, and available pressure must form a coherent whole. It is this coherence that ensures stable comfort, acceptable noise levels, and lasting performance.

The importance of the air return in a ducted installation

When a customer thinks of a ducted system, they often think of the visible air outlets in the rooms. However, the air return is just as important. Without a properly sized air return, the indoor unit may lack airflow, become noisier, or lose efficiency.

In our AirGreen installations, we pay special attention to this point. The air return must be positioned to allow smooth circulation, without creating dead zones or forcing the unit. Good distribution is not just about sending cold or hot air into a room; the air must also return properly to the system.

This step is often the difference between an installation that simply works and an installation that offers real comfort every day.

An HVAC expertise that protects performance, aesthetics, and durability

This installation in Sainte-Thérèse clearly demonstrates the value of a team specialized in more technical projects. A Slim Duct GREE system requires mastery of several aspects: refrigeration, ventilation, electricity, drainage, mechanical supports, building sealing, and post-installation service.

Key steps completed by our team

For this project, our team followed a structured work sequence to ensure a clean and reliable result:

1. Validation of the outdoor location
   We analyzed air circulation around the balcony, the presence of the guardrail, the metal staircase, the soffit, and service access points.
2. Installation of the outdoor unit support
   The GREE unit was installed on a raised, stable support suitable for the outdoor environment.
3. Routing of refrigerant and electrical lines
   The connection ducts were carefully placed to limit exposure, facilitate service, and preserve the building’s appearance.
4. Preparation for ducted indoor integration
   The indoor unit and ducts were planned to promote even air distribution.
5. Technical checks before startup
   Connections, vacuuming, leak tests, and operating parameters were checked according to industry standards.
6. Client explanations
   We explained the system’s use, good maintenance practices, and points to watch to maintain optimal performance.

Mistakes to avoid with a ducted heat pump

Ducted installations can offer remarkable comfort, but they forgive design errors very little. Here are the problems we systematically avoid on our projects:

A poor capacity choice

A device that is too small will run too often at full capacity. A device that is too large can cause short cycles, poorly controlled humidity, and less stable comfort. Sizing must be done according to the building, not a quick estimate.

Poorly adapted ducts

Ducts that are too narrow, too long, or poorly insulated can reduce airflow and increase noise. The quality of the duct network is as important as the brand of the machine.

An outdoor unit that is too confined

On a balcony like Sainte-Thérèse’s, clearances must be respected. A device installed too close to an obstacle can recycle its own hot or cold air, which reduces its efficiency.

Neglected drainage

Condensate drainage is essential, especially with a concealed indoor unit. Poor slope or bad connection can cause damage. We always plan this aspect from the start.

Insufficient service access

A hidden system must remain accessible. HVAC maintenance and future repairs must be possible without unnecessary demolition.

GREE, a flexible range for residential and multi-family projects

AirGreen offers several GREE ducted solutions adapted to houses, condos, plexes, and small buildings. Available models include FM Ducted Conduit systems, low and high static pressure versions, as well as the All Match Slim Duct R32 series. This variety allows us to tailor the recommendation to the project rather than impose a single configuration.

Selected GREE models can offer up to 12 years of warranty, depending on applicable conditions. The range also includes models designed to perform heating in cold weather, with capacities that can meet the realities of the Quebec climate. For clients in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this flexibility is important, as each building imposes its own constraints.

Subsidies and eligibility: a check to do before confirming the project

Clients often ask us if a GREE ducted heat pump can be eligible for a subsidy, especially through programs like Hydro-Québec's LogisVert. Eligibility depends on the exact model, the indoor-outdoor combination, energy certification, and the applicable technical file.

At AirGreen, we verify this information before presenting the final offer. When a subsidy is available for a specific combination, we provide the relevant details and give the client the necessary documents after installation. This transparency avoids unrealistic expectations and allows the client to make a decision based on reliable information.

A result adapted to the reality of Sainte-Thérèse

The building in Sainte-Thérèse presented a typical context for installations in dense residential areas: limited space, narrow rear access, metal staircase, balcony shared with other building elements, and the need for a clean finish. These constraints highlight the importance of an experienced installer.

The GREE outdoor unit was installed stably, with a controlled connection layout and special attention to future access. Inside, the ducted principle allows the client to enjoy more discreet comfort without sacrificing the appearance of the main rooms.

This project illustrates our way of working at AirGreen: analyzing the building, choosing the appropriate equipment, anticipating constraints before the work, installing cleanly, and clearly explaining the operation to the client.

Why choose AirGreen for a GREE ducted installation

A ducted project requires more than a good machine. It requires a team capable of understanding the building, designing an efficient air network, and installing each component with precision. AirGreen supports its clients from the initial assessment to after-installation service, with a clear, structured approach adapted to local realities.

Our clients choose us for:

• our detailed and transparent estimates;
• our experience in residential and multi-unit HVAC installation;
• our expertise with GREE ducted systems;
• our ability to work in complex spaces;
• our knowledge of the requirements in Montréal, Laval, Longueuil, on the North Shore and the South Shore;
• our after-sales service;
• our $5,000,000 liability insurance;
• our support for documents related to subsidies when applicable.

In Sainte-Thérèse, this installation of a GREE All Match Slim Duct R32 ducted heat pump demonstrates that a discreet system can also be robust, well integrated, and designed to last. The final comfort depends on the quality of the design, the choice of the right model, and attention to detail on site. This is exactly what we delivered in this project.