An invisible HVAC installation that transforms comfort without transforming the decor
In Sainte-Marthe-sur-le-Lac, this installation carried out by AirGreen perfectly illustrates one of the great advantages of a ducted system, also called ducted conduits, Slim Duct or ductable: to offer complete, uniform, and silent comfort without imposing a visible wall unit in living spaces.
In this residence, the client's need was clear: to improve heating and cooling in several zones of the house while maintaining a sober interior finish. The choice was therefore directed towards a GREE ducted solution, integrated into the ceiling, with discreet air outlets in the form of circular diffusers. The final result is particularly clean: a white diffusion grille, well aligned with the ceiling, almost imperceptible in the interior layout, but capable of efficiently distributing conditioned air throughout the space.
This type of HVAC installation is particularly appreciated in houses, condos, and renovation projects where interior aesthetics matter as much as performance. Unlike a traditional wall-mounted heat pump, the ducted system hides the indoor unit in a technical space, a false ceiling, an attic, or a service area, then distributes air through a network of short, well-sized ducts.
Why a GREE ducted system was suitable for this house
The project presented several elements that made the GREE All Match Slim Duct R32 solution very relevant:
- the client wanted to avoid the appearance of a visible wall unit;
- the available ceiling space allowed for discreet integration;
- the air distribution had to be comfortable, without too aggressive direct airflow;
- the residence required an efficient solution for both cooling and heating;
- the system had to remain accessible for future HVAC maintenance;
- The installation had to respect the existing architecture, without unnecessary work.
The GREE ducted systems offered by AirGreen cover several capacities, including 9,000, 12,000, 18,000, 24,000, 30,000, and 36,000 BTU, allowing the machine to be adapted to the actual volume to be treated. For this type of project, the capacity choice is never random: our technicians consider the area, insulation, solar orientation, ceiling height, room layout, and desired comfort level.
In several residences on the North Shore, in Montreal, Laval, Longueuil, and the South Shore, we observe the same scenario: a client wants a high-performance heat pump but does not necessarily want to see a wall unit in the living room, master bedroom, or hallway. The Slim Duct system precisely meets this need.
A ceiling finish designed to remain discreet
One of the most visible elements of this installation is precisely what takes up almost no space: the ceiling diffuser. For this type of system, the quality of the finish is essential. A poorly positioned, too visible, or misaligned air outlet can harm the final result, even if the mechanical performance is good.
At AirGreen, we pay special attention to:
- exact location of the diffusers;
- air direction;
- distance from detectors, lighting fixtures, and obstacles;
- visual symmetry in the room;
- easy access for maintenance;
- vibration and noise reduction.
In this project in Sainte-Marthe-sur-le-Lac, the circular diffuser installed on the ceiling allows for gentle and well-distributed airflow. This approach is ideal to avoid the sensation of cold air directly blowing on occupants, a problem sometimes observed with less well-designed installations.
Technical features of a GREE ducted system
A GREE ducted system operates with a concealed indoor unit and an outdoor unit connected by refrigerant lines, communication wiring, and a condensate drainage system. Depending on the chosen configuration, it can be installed with low static pressure or high static pressure.
The difference is significant:
Low static pressure
The low static pressure version is generally used when the duct network is short, with few pressure losses. It is very suitable for compact residential installations, false ceilings, corridors, or areas where one or two adjacent rooms need to be supplied.
High static pressure
The high static pressure version is better suited when the air must travel a longer distance, pass through several ducts, or supply multiple diffusers. This type of installation requires more precise sizing because the airflow must remain stable even with a more complex configuration.
In both cases, the success of the installation depends as much on the machine as on the network design. A high-performance heat pump will not deliver its full capacity if the ducts are poorly sized, if pressure losses are too high, or if the air is not well balanced.
The role of R32 in the new generation GREE
The GREE All Match Slim Duct R32 series belongs to a newer generation of systems using the refrigerant R32, known for its energy efficiency and reduced environmental impact compared to some older refrigerants. For homeowners planning a sustainable installation, this is an important factor.
The main advantages of R32 in this context are:
- better thermal efficiency;
- often optimized refrigerant charge;
- technology adapted to new market standards;
- better alignment with Quebec’s energy efficiency goals.
As always, refrigerant handling must be done only by qualified professionals. At AirGreen, our installations are carried out by experienced refrigeration technicians, equipped with the necessary tools to ensure sealing, vacuuming, commissioning, and pressure checks according to best practices.
The key steps of this ducted installation in Sainte-Marthe-sur-le-Lac
On-site analysis and concept validation
Before installation, our team assessed the available space, ceiling constraints, the best route for the ducts, and the optimal location for the indoor unit. In a ducted project, this step is crucial. It’s not enough to just choose a machine: you need to verify if the house allows for effective air distribution and reasonable access to the equipment.
We specifically checked:
- the available height in the installation area;
- the ceiling structure;
- existing obstacles;
- the presence of detectors and electrical components;
- the possible route for the ducts;
- the path of the drain;
- the outdoor location of the unit;
- the acceptable noise level for the occupants.
This preparation helps avoid unpleasant surprises during the project. It also allows us to clearly explain to the client what will be visible after the work and what will remain hidden.
Installation of the indoor unit and ducts
The GREE ducted indoor unit was positioned in a discreet space, with special attention to the sturdiness of the support, acoustic insulation, and accessibility. For a system of this type, an installation that is too tight or hard to access can complicate future maintenance. We therefore always plan for realistic technical access.
The ducts were then installed to limit pressure losses. Unnecessary lengths, too-tight bends, and poorly designed transitions can reduce performance. That’s why our technicians pay as much attention to the air path as to the machine itself.
In this project, the goal was to create comfortable diffusion while maintaining a very clean appearance. The choice of circular ceiling diffusers allowed for a neat finish, suited to the existing interior.
Condensate drainage management
A point often underestimated in ducted systems is drainage. In cooling mode, the indoor unit produces condensation. This water must be evacuated reliably, quietly, and durably.
Depending on the configuration, drainage can be done by gravity or with a pump. The choice depends on the unit’s location, the available slope, and the distance to cover. Poor condensate management can cause odors, leaks, system shutdowns, or ceiling damage.
At AirGreen, we always verify:
- the slope of the drain;
- protection against water backflow;
- accessibility for cleaning;
- the stability of the pump if needed;
- the absence of vibration;
- the final drainage.
This level of detail makes a big difference in the long-term reliability of an HVAC installation.
Installation of the GREE outdoor unit
The outdoor unit was installed in a location allowing good air clearance, service accessibility, and noise reduction. In Sainte-Marthe-sur-le-Lac, as in many residential areas of the North Shore, the outdoor location must be carefully chosen to respect the comfort of the client, the neighborhood, and the building constraints.
We pay special attention to:
- stability of the support;
- height relative to snow;
- defrost water drainage;
- clearances around the unit;
- the protection of refrigerant lines;
- the exterior finish of ducts and cables.
GREE systems designed for the Quebec climate offer interesting heating performance, with some models adapted to very low temperatures, down to about -30 °C depending on configurations. This makes it a relevant option for owners who want to reduce their dependence on less efficient heating systems while maintaining stable comfort during winter.
Commissioning and air balancing
Once the equipment is installed, commissioning is not limited to starting the machine. Our technicians check the complete operation of the system:
- air conditioning mode test;
- heating mode test;
- pressure verification;
- drainage control;
- validation of the airflow;
- listening for vibrations;
- adjustment of the registers if applicable;
- explanation of the operation to the client.
With a ducted system, air balancing is essential. A diffuser that is too strong can create discomfort; a diffuser that is too weak can leave an area less well treated. The goal is to achieve homogeneous comfort, without excessive noise and without unpleasant drafts.
What the client notices after installation
After this type of project, feedback often focuses on three points: silence, aesthetics, and uniform comfort. The client does not see a large wall unit, does not lose wall space, and enjoys a more stable temperature in the served rooms.
In a house like this, the difference is especially noticeable during hot and humid days, but also during cold periods when the heat pump contributes to heating. The system works more discreetly, with air distribution better integrated into the architecture.
Mistakes to avoid with a ducted system
A Slim Duct system can deliver excellent results, but only if it is well designed. Here are the most common mistakes we systematically avoid:
Choose a capacity based only on the area
The area gives a first indication, but it is not enough. A very glazed, poorly insulated, or south-facing room may require a different capacity than a more protected room. Conversely, an oversized machine can create short cycles, discomfort, and poorer dehumidification.
Installing ducts that are too long or too restrictive
An improperly sized duct increases pressure losses and reduces actual flow. The system can then become noisier, less efficient, and less comfortable.
Neglecting service access
A hidden ducted system must not become inaccessible. Filters, the drain, fittings, and some components must remain accessible for HVAC maintenance.
Placing diffusers without considering air movement
Air must circulate naturally in the room. A diffuser placed too close to a wall, obstacle, or sensor can harm performance and aesthetics.
Underestimating drainage
A poorly designed drain can cause costly problems. It is one of the most important points in any ducted system installation.
Why choose AirGreen for a GREE ducted heat pump
AirGreen is a GREE Elite dealer, which gives us a concrete advantage for specialized installations like ducted systems. Our teams are trained to understand the differences between low static pressure, high static pressure, short ducts, more complex networks, pressure losses, and service requirements.
Our approach is based on simple principles:
- propose a solution truly adapted to the building;
- clearly explain the available options;
- install with precision and cleanliness;
- avoid shortcuts that harm performance;
- offer reliable after-sales service;
- work with liability insurance of 5 000 000 $;
- support clients with their subsidy questions when models are eligible.
Our clients in Montreal, Laval, Longueuil, on the North Shore and the South Shore often contact us after receiving conflicting advice about the feasibility of a project. In many cases, an installation considered difficult by another company becomes possible thanks to a better building analysis and more precise HVAC design.
Subsidies and energy eligibility
GREE ducted systems can, depending on the exact model installed, capacity, certifications, and current criteria, be eligible for certain energy subsidies. Programs like Hydro-Québec's LogisVert generally require the equipment to meet specific criteria, especially regarding efficiency and certification.
At AirGreen, we help clients understand the necessary information for their request: indoor model, outdoor model, invoice, installation date, capacity, AHRI number if applicable, and technical documents. Since criteria can vary depending on the model and period, we always verify the information at the time of submission.
For an owner, this step is important because a good heat pump is not chosen solely based on the purchase price. You also need to consider:
- potential energy savings;
- the system's lifespan;
- the quality of the installation;
- the warranty;
- availability of parts;
- access to service;
- the added value to the building.
Comfort that naturally integrates into the home
This installation in Sainte-Marthe-sur-le-Lac clearly demonstrates why GREE All Match Slim Duct R32 systems are gaining popularity in residential projects. They provide a high-performance solution that is almost invisible. For clients who want a clean interior, it is a very interesting alternative to traditional wall units.
The ceiling diffuser becomes the only visible trace of the system in the room. Behind this apparent simplicity, however, lies precise technical work: capacity calculation, unit positioning, duct installation, insulation, drainage, refrigerant lines, electrical supply, commissioning, and balancing.
It is exactly in this type of project that the experience of a team specialized in HVAC makes the difference. A successful ducted installation is not only measured on the day of installation. It is measured in daily comfort, quiet operation, drainage reliability, the quality of the distributed air, and customer satisfaction several seasons later.
At AirGreen, we design each project as a complete solution, not just a simple equipment installation. This project with a GREE ducted system in Sainte-Marthe-sur-le-Lac is an excellent example: efficient technology, discreet integration, and a clean finish that respects the client's living space.