A ceiling integration that transforms a limited technical space into a discreet and efficient HVAC solution
In Montréal-Nord, our AirGreen team completed a HVAC installation of the ducted type, with an indoor unit GREE All Match Slim Duct R32 integrated into an open ceiling space. This type of system, also called ducted ducts, Slim Duct, or ductable, meets a very specific need: to offer the comfort of a modern heat pump while keeping the equipment almost entirely hidden once the work is completed.
The photo of the site clearly shows the technical reality of this project: a GREE indoor unit installed in a ceiling opening, with exposed wooden structure, visible refrigerant connections, wiring on standby, insulated flexible ducts, and mechanical access to be planned for future maintenance. This is not a standard installation where the unit is simply mounted on the wall. Here, every clearance, every connection, and every orientation must be carefully planned to fit into a limited space without compromising service, drainage, airflow, or acoustic comfort.
In many residences in Montreal, especially in denser areas like Montréal-Nord, customers are looking for an efficient but discreet heating and air conditioning solution. Walls are sometimes already occupied by windows, moldings, furniture, cabinets, or architectural elements. The ducted system then becomes a very interesting solution because it allows air to be delivered through discreet grilles rather than installing a visible wall unit in each room.
Why choose a GREE ducted system in a residence in Montréal-Nord?
The choice of a GREE ducted system is explained by the combination of three priorities: comfort, integration, and technical control. The GREE range offered by AirGreen includes FM Ducted systems in low or high static pressure, as well as the GREE All Match Slim Duct R32 series, available in several capacities, including 9,000 BTU, 12,000 BTU, 18,000 BTU, 24,000 BTU, 30,000 BTU, and 36,000 BTU, depending on the project configuration and required sizing.
In this project, the installed unit had to fit into an already crowded ceiling space. The photo shows that the structure did not offer much free volume: beams, old construction elements, cables, ducts, and finishing limits all had to be considered. This type of context is common in renovations in Montréal, where one often has to work with existing buildings rather than with an open, new structure.
The advantage of the Slim Duct GREE is precisely its ability to adapt to projects where space is limited. Once the installation is complete and the opening is closed with appropriate service access, the client benefits from a solution more discreet than a traditional wall unit. Air is distributed through ducts, with outlets better integrated into the interior design.
The importance of mechanical access in a concealed installation
A ducted system is designed to be discreet, but it should never become inaccessible. This is an essential nuance. In this installation in Montréal-Nord, the unit was placed in a ceiling technical space, but our team took into account the future needs of HVAC maintenance: access to the filter, fittings, electrical box, drain, refrigerant connections, and diagnostic elements.
A poorly planned installation can become very costly to maintain. If the unit is enclosed without sufficient access panels or if important components are placed against a structure that is hard to reach, even minor future interventions may require opening a ceiling or a wall. At AirGreen, we plan the installation to avoid this type of problem.
In this case, the opening visible in the photo allowed proper work during the installation phase. The finish then had to be designed to maintain clean, stable, and sufficiently wide access. This detail is particularly important for ducted systems, as aesthetics should not come at the expense of maintenance.
Refrigerant connections and R32 refrigerant: precision and compliance
The GREE All Match Slim Duct R32 systems use, depending on the models concerned, the refrigerant R32, a technology associated with new generations of heat pumps. Installing refrigerant lines requires rigorous execution: compatible lengths, adequate insulation, protection of connections, adherence to brazing or connection procedures according to specifications, leak testing, vacuum pulling, and controlled commissioning.
In the photo, you can see the connections on the indoor unit side as well as the lines routed outside. These elements must be carefully protected and organized, especially when they pass through a ceiling cavity. Poor line management can create mechanical stress, vibrations, condensation, or access difficulties.
Our role is to install the heat pump in compliance with industry standards, manufacturer requirements, and building realities. For the client, this rigor results in a more reliable, stable, and easier-to-maintain system over the years.
Air distribution: the true heart of a ducted system
In a ducted system installation, the unit represents only part of the result. The final comfort strongly depends on air distribution. The ducts must be sized and positioned to limit pressure losses, reduce noise, and ensure consistent distribution between rooms.
A ducted system can supply one or more zones depending on the configuration. The network can be simple, with short ducts, or more complex, with multiple branches. In all cases, the following must be considered:
- the required air flow;
- the available static pressure;
- the length of the ducts;
- the number of bends;
- the insulation of the ducts;
- the positioning of the grilles;
- the air return;
- the air velocity at the outlets;
- the acceptable noise level in the rooms.
In Montréal-Nord, this installation required particular attention to the available space in the ceiling. The ducts had to be routed without creating excessive pressure or unnecessary friction. In a restricted cavity, every change of direction matters.
Low static pressure or high static pressure: a choice not to improvise
GREE ducted systems can be offered in low or high static pressure depending on the series and project needs. This choice is not a simple technical detail. It determines the unit’s ability to push air through the duct network.
A short configuration, with few ducts and few grilles, can operate efficiently with low static pressure. On the other hand, a longer network, with several branches or more significant restrictions, may require a high static pressure unit. A poor selection can cause several problems: low airflow at the grilles, air noise, reduced performance, discomfort in certain rooms, or less efficient operation.
At AirGreen, we select the system according to the building’s reality. The BTU capacity is important, but it is not enough. It is also necessary to verify if the unit can operate properly with the planned network. This approach helps avoid installations that seem adequate on paper but disappoint once in service.
The technical challenges of a ducted installation in an existing ceiling
This project in Montréal-Nord clearly illustrates the challenges encountered during a renovation or integration in an existing building. The space is never perfectly free. Openings must be limited. Components must pass between structural elements. Ducts must be discreet but functional. And above all, the final finish must remain clean.
Working in a ceiling cavity without compromising the structure
The first constraint was integrating the unit into a ceiling cavity. The technicians had to position the machine securely, with adequate support, while respecting the beams, the existing opening, and the necessary clearances. The wooden structure visible in the photo shows that the team had to work in an environment where every inch counted.
This type of work requires precise coordination. A poorly positioned unit can complicate refrigerant connections, drainage, or access to the electrical box. It can also make duct routing more difficult. Our team therefore worked considering the entire system, not just the location of the unit.
Drainage: a critical detail for reliability
In air conditioning, the indoor unit produces condensation. This water must be properly drained. In a ducted system installed in the ceiling, drainage becomes a critical point. A sufficient slope must be planned when possible, or an adapted solution integrated when gravity is not enough. Poor drainage can cause overflows, odors, safety shutdowns, or ceiling damage.
In this project, the drain positioning had to be planned from the start. Since the unit is installed in a cavity, it was important to preserve access to drainage components for inspection and maintenance. At AirGreen, we pay great attention to this point because many service problems with air conditioning systems come from a poorly designed, poorly cleaned, or hard-to-access drain.
Acoustic comfort in a concealed installation
Customers who choose a ducted system often expect a discreet solution. This discretion must be visual but also acoustic. In a ceiling, vibrations can transmit to the structure if the unit is poorly mounted or if the ducts are too rigid. Air velocity can also become audible if the grilles or ducts are improperly sized.
To limit these risks, our technicians work on several aspects:
- stable mounting of the unit;
- appropriate clearances around the unit;
- clean and well-aligned connections;
- insulated ducts when required;
- limiting sharp bends;
- proper selection of grilles;
- airflow balancing;
- access provided for adjustments.
The desired result is a system that goes unnoticed in daily use while maintaining a stable temperature.
Common mistakes to avoid with ducted systems
Owners considering a GREE ducted heat pump should pay attention to several common mistakes.
The first is to choose a BTU capacity without a complete analysis. The area alone is not enough. You must consider insulation, windows, solar orientation, ceiling height, number of occupants, and room layout.
The second mistake is neglecting the air return. A ducted unit must receive enough air to operate properly. A poorly positioned return can reduce performance and increase noise.
The third mistake is enclosing the machine without access. A clean installation must also be maintainable. The filter, drain, and fittings must remain accessible.
The fourth mistake is choosing a contractor based solely on price. Two installations with the same brand can yield very different results depending on the quality of sizing, ducts, fittings, and commissioning.
The fifth mistake is underestimating the importance of balancing. When multiple air outlets are installed, it is necessary to ensure that each room receives the correct airflow. Without balancing, comfort can be uneven.
Energy efficiency, ENERGY STAR, and potential subsidies
The ducted GREE systems offered by AirGreen include several models, some of which can be associated with ENERGY STAR certifications and potential eligibility for subsidy programs, depending on the exact combination of units, installed capacity, and criteria in effect at the time of the project. We always verify this information during the submission to guide the client toward a solution suited to their budget and goals.
For owners in Montreal, Laval, Longueuil, the North Shore, and the South Shore, subsidies can play an important role in the decision. However, they should not replace the right technical choice. An eligible machine must also be properly sized, well installed, and suited to the building. The best result comes from balancing performance, comfort, net cost, and quality of execution.
AirGreen expertise tailored to Montreal buildings
Our experience in Greater Montreal often leads us to work in complex contexts: limited ceilings, old walls, condos, townhouses, multiplexes, renovated buildings, access constraints, and high expectations for finishing. This project in Montréal-Nord is a good example. The installation required both a technical understanding of the GREE system and the ability to work neatly in an existing space.
AirGreen regularly operates in Montréal, Laval, Longueuil, on the North Shore and the South Shore for projects involving heat pumps, wall air conditioners, central systems, ducted units, and HVAC maintenance. In the case of ducted systems, our advantage lies in the ability to consider the installation as a complete whole: machine, ducts, air return, drainage, acoustics, service access, and finishing.
The desired result: integrated comfort, without compromising maintenance
Once the work is completed, the client receives a discreet solution, adapted to their space and designed to improve comfort without overloading the walls with visible units. The indoor unit is hidden in the ceiling, the ducts distribute air to the designated areas, and mechanical access preserves maintenance capability.
It is this combination that makes ducted systems so appealing: they offer a neater architectural integration but require more rigorous execution. At AirGreen, we treat each installation of this type as an HVAC design project, not just a simple equipment installation.
Why entrust a GREE ducted installation to AirGreen?
Installing a GREE All Match Slim Duct R32 ducted heat pump requires specific expertise. You need to understand BTUs, but also static pressure, ducts, air return, condensation, noise, service access, and building constraints. A well-executed installation provides stable comfort, better visual integration, and a more reliable system.
AirGreen stands out for clear estimates, a transparent technical approach, experienced technicians, and special attention to details that are not always visible once the ceiling is closed. In this project in Montréal-Nord, our team demonstrated the importance of precise work in a confined space, with a well-integrated GREE unit and an installation designed to last.