Installation of a GREE All Match Slim Duct R32 ducted heat pump in Dollard-des-Ormeaux: custom ductwork, four-branch plenum, and discreet HVAC comfort

A GREE ducted project designed around clean, stable, and almost invisible air distribution

In Dollard-des-Ormeaux, in the west of Montreal Island, our AirGreen team completed a HVAC installation where the quality of the duct network was as important as the choice of the ducted heat pump itself. The project involved integrating a GREE All Match Slim Duct R32 system, a Ducted – Duct Systems – Slim Duct – Ductable type solution, designed for owners seeking uniform comfort without multiplying visible devices on the walls.

The photo taken on site shows an essential stage of the project: the preparation of a custom metal plenum with four circular galvanized sheet metal outlets. This piece, often barely visible once the installation is finished, plays a central role in the final performance. It allows air to be distributed to several ducts, each intended to supply a specific area of the residence. In a ducted installation, this type of fabrication requires precision, as each connection influences the airflow, static pressure, operating noise, and thermal balance between rooms.

The client wanted a discreet, efficient solution adapted to a property where architectural integration was very important. A traditional wall-mounted heat pump could have met part of the need, but it would not have allowed the same air distribution or the same level of visual discretion. The choice of a GREE ducted system allowed the indoor unit to be installed in a technical space or a false ceiling, then distribute the air through carefully positioned grilles.

At AirGreen, we carry out this type of project in Montreal, Laval, Longueuil, on the North Shore and the South Shore, but houses in Dollard-des-Ormeaux often have particularities that make design very important: spaces renovated in stages, existing frameworks, ceilings to be opened carefully, high aesthetic requirements, and a desire to preserve the interior charm. In this context, preparing the duct network becomes a decisive step.

Why the GREE All Match Slim Duct R32 was suitable for this installation

The GREE All Match Slim Duct R32 range offers an interesting solution for residential projects where comfort, discretion, and installation flexibility are desired. The GREE ducted systems offered by AirGreen include several capacities, notably 9,000, 12,000, 18,000, 24,000, 30,000, and 36,000 BTU depending on configurations and building needs. This variety allows sizing the system according to the actual thermal load rather than choosing a unit solely based on approximate area.

In the case of this installation in Dollard-des-Ormeaux, the analysis focused on several concrete criteria:

• the area to be treated;
• the number of zones to supply;
• heat losses and gains;
• the existing insulation;
• the orientation of the rooms;
• the available space for the indoor unit;
• the length of the ducts;
• the number of air outlets;
• the available static pressure;
• the desired noise level;
• future access for HVAC maintenance.

The GREE ducted system was relevant because it allowed for a more integrated solution than a wall unit. Air can be delivered to multiple rooms from a single indoor unit, with discreet grilles and more even distribution. For a homeowner who wants to improve comfort without changing the appearance of living spaces, this approach offers a clear advantage.

A four-outlet plenum: the technical component that organizes comfort

The most striking element of this installation is the metal plenum visible in the photo. It is a distribution box designed to connect multiple ducts to the ducted unit. The four circular outlets allow air to be distributed to different zones, minimizing losses and facilitating balancing.

In a ducted system installation, the plenum must not be improvised. An improperly sized box can create turbulence, increase noise, reduce available airflow, or unbalance the rooms served. Conversely, a well-designed component helps stabilize the air at the unit's outlet and directs it more smoothly into the ducts.

On this site in Dollard-des-Ormeaux, our work was to prepare a distribution that would respect both the physical constraints of the house and the system's performance requirements. The outlets were aligned to facilitate duct connections, reduce mechanical stress, and allow for a cleaner installation once the unit was in place.

The details that protect system performance

A ducted heat pump can be very efficient, but only if the duct network is treated with the same rigor as the device. The plenum, fittings, clamps, flexible or rigid ducts, grilles, and air return form a whole. A weakness in any of these elements can reduce overall comfort.

For this installation, we paid special attention to:

• mechanical strength of the outlets;
• sealing of joints;
• reducing air losses;
• proper orientation of outlets;
• limiting overly tight bends;
• compatibility with the system's static pressure;
• the ability to adjust airflow if necessary;
• accessibility for future inspection.

This work may seem very technical, but it has a direct impact on the client's daily life. A poorly connected duct can create a room that is too hot, another too cold, disturbing air noise, or reduced efficiency. Conversely, a well-thought-out network makes the system more stable, quieter, and more pleasant to use.

A discreet HVAC installation that requires true mastery of ductwork

The importance of static pressure in a Slim Duct system

In a Slim Duct type system, static pressure is a key factor. It represents the fan's ability to push air through the duct network. The longer or more complex the network, the greater the pressure losses. If static pressure is not properly assessed, the device may struggle to distribute air correctly.

This is one of the reasons why we always analyze the duct path before installation. In Dollard-des-Ormeaux, the goal was to avoid an unnecessarily complicated network. The four outlets from the plenum had to supply the intended zones with coherent routes, without forcing the device to compensate for an overly restrictive design.

A common mistake in ducted installations is choosing a device that is efficient on paper, then connecting it to an ill-suited network. The client does not always see this part of the work, but they immediately feel it in their comfort. A room that receives too little air, a noisy grille, or a system that runs longer than necessary are often symptoms of insufficient design.

R32, energy efficiency, and subsidy eligibility

The GREE All Match Slim Duct R32 series represents a modern approach to residential air conditioning and heating. The refrigerant R32 is used in some recent models and is paired with a design focused on better energy performance. Several GREE ducted systems are also available in Energy Star versions, depending on the models and unit combinations.

For customers in Montreal, Laval, Longueuil, the North Shore, and the South Shore, eligibility for subsidies, especially under programs like Hydro-Québec’s LogisVert when criteria are met, often plays an important role in the decision. At AirGreen, we guide customers toward choices consistent with applicable requirements: model, indoor-outdoor unit combination, AHRI number, recognized efficiency, and required documents after installation.

It is important to emphasize that eligibility always depends on the exact installed configuration and the criteria in effect at the time of the work. We avoid vague promises: we verify the available information, prepare a clear invoice, and help the customer understand the necessary steps to submit their application when the system is eligible.

An ideal integration for renovations and high-end spaces

Ducted systems are especially appreciated in renovations where the final appearance matters a lot. In Dollard-des-Ormeaux, the goal was to keep walls clear and avoid the visual impact of a visible indoor unit. Once the system is finished, the visible elements are generally limited to the supply and return grilles, resulting in a clean and well-integrated look.

This type of solution is well suited for:

• for renovated houses;
• for floors with several small rooms;
• for living areas where aesthetics need to be preserved;
• for projects with false ceilings;
• for homeowners who want more even air distribution;
• for customers who want quiet comfort;
• to spaces where a wall heat pump would be visually less appealing.

However, ducted systems require more advanced planning. Unlike a wall unit, it is not enough to choose an exterior wall and connect the device. The entire network must be considered: where the air will be blown, where it will be returned, how the ducts will run, how the unit will be maintained, and how to avoid performance losses.

Drainage, service access, and HVAC maintenance

Another fundamental aspect of a ducted installation is condensate drainage. Since the unit is often installed in a ceiling, attic, or technical space, poor water management can cause significant damage. The drainage slope, outlet location, use of a condensate pump if needed, and access to the line must be validated from the start.

HVAC maintenance must also be taken into account. A ducted system should never be enclosed without access. The filter, connections, service panel, drain, and main components must remain accessible. In this installation, our planning aimed to protect the client's comfort today, but also to facilitate future interventions.

A good HVAC system is one that can be properly maintained. Owners often think about immediate comfort, but service accessibility directly influences the lifespan of the installation.

Mistakes to avoid before choosing a ducted system

Before installing a GREE ducted heat pump, several common pitfalls must be avoided.

Choosing only based on the number of BTUs

BTU capacity is important, but it is not enough. Two houses of the same size can have very different needs depending on insulation, sunlight, ceiling height, number of windows, and interior layout.

Neglecting the air return

A ducted system must breathe properly. If the air return is poorly positioned or insufficient, the system can become noisy, less efficient, or unable to balance temperatures.

Multiplying ducts without calculating losses

Adding air outlets may seem advantageous, but each duct adds resistance. The network must be designed according to the actual capacity of the fan and the available static pressure.

Ignoring air noise

A duct that is too small or a poorly selected grille can create constant noise. In a project where the client chooses a discreet system, acoustic comfort is as important as temperature.

Entrusting the project to a team without ducted experience

A ducted duct installation is more complex than a classic wall-mounted installation. It requires understanding airflow, ducts, refrigeration, drainage, electricity, and interior integration.

The AirGreen approach in Dollard-des-Ormeaux

On this site, our team worked with a structured approach: needs validation, space analysis, plenum preparation, duct planning, connections, checks, and commissioning. The client wanted a reliable and clean solution, with no compromise on the final appearance.

Our role was to turn a simple need to express — discreet heating and cooling — into a precise technical installation. The four-outlet plenum illustrates this reality well: behind a discreet ceiling grille lies design and assembly work that determines the quality of comfort.

AirGreen is a GREE Elite dealer, and this expertise is especially useful for ducted systems. We know the differences between low static pressure, high static pressure, and Slim Duct systems. We also know that the right choice depends on the building, not just the product sheet.

Well-distributed comfort for the west of Montreal

This installation in Dollard-des-Ormeaux shows why ducted systems are gaining popularity in well-crafted residential projects. They allow combining performance, discretion, and comfort, provided the design work is done rigorously.

The GREE All Match Slim Duct R32 meets the expectations of customers who want an integrated solution, with more uniform air distribution and minimal visual presence. The custom plenum, four duct outlets, and attention to static pressure show that the success of such a project depends as much on the installation as on the chosen unit.

For owners in Dollard-des-Ormeaux, Montreal, Laval, Longueuil, the North Shore and the South Shore, AirGreen offers GREE ducted solutions adapted to building realities, with a clear, professional approach focused on lasting comfort.