A ducted project completed in a tight technical space in Deux-Montagnes
In Deux-Montagnes, this AirGreen installation perfectly illustrates what many homeowners are looking for today: a ducted heat pump system capable of providing uniform comfort, without a visible wall unit in living spaces. The choice was made for a GREE Ducted – Slim Duct – Ductable solution, a family of systems designed to be integrated into an attic, a technical ceiling, a false ceiling, or a suitable duct network.
In this project, one of the most important aspects was not just the equipment selection, but the physical integration of the unit and ducts in a tight space. As seen on site, the team worked in a technical area under the roof, with a sloped wooden structure, loose insulation, metal ducts, insulated flexible connectors, and areas where every inch had to be used precisely. This is exactly the type of context where a HVAC installation requires experience, method, and a good understanding of pressure losses.
The client wanted a solution more discreet than a traditional wall-mounted system, while maintaining effective air distribution. A GREE ducted conduit meets this need well, as it allows conditioned or heated air to be directed to multiple zones from a concealed indoor unit. Unlike a visible wall-mounted air conditioner, the ducted system goes unnoticed: only the supply and return air grilles remain visible.
Why a GREE Ducted System was suitable for this house
The GREE FM Ducted Conduit and GREE All Match Slim Duct R32 systems offered by AirGreen cover several capacities, including 9,000 BTU, 12,000 BTU, 18,000 BTU, 21,000 BTU, 24,000 BTU, 30,000 BTU, and 36,000 BTU, depending on the chosen configuration. This variety allows the solution to be adapted to the volume of the house, the number of rooms served, the level of insulation, sunlight exposure, duct length, and the required airflow.
In a ducted installation, it would be unwise to choose a capacity in BTU based solely on the area. Proper sizing takes several factors into account:
- the actual length of the ducts;
- the number of air outlets;
- the available static pressure;
- restrictions caused by elbows, reducers, and transitions;
- the insulation of the attic or technical ceiling;
- the heating power needed during winter;
- the system’s ability to maintain stable airflow without excessive noise.
At AirGreen, we pay special attention to these points, especially for installations in the North Shore, where many homes in Deux-Montagnes, Saint-Eustache, Sainte-Marthe-sur-le-Lac, and Boisbriand have complex attic spaces. An improperly sized system may seem to work at first but later produce uneven rooms, too low airflow, blowing noise, or too short cycles.
An attic installation that required clean execution
The site required precise work around existing ducts and newly adapted fittings. The network visible in the photo shows a combination of insulated rigid and flexible ducts, with joints sealed with metal tape and protected against air leaks. This detail is essential: in an attic, a small leak in a duct can cause significant losses, especially in air conditioning when cold air circulates in a warmer space.
Our technicians worked to maintain airtight continuity on the joints. The goal was to limit losses, protect the insulation, ensure stable airflow, and prevent moisture from becoming a problem around cold surfaces. In ducted heat pump installations, sealing quality is not just an aesthetic detail; it directly affects system efficiency, comfort, and durability.
The restricted access also required good site organization. Tools, fittings, duct sections, and insulating materials had to be positioned so as not to damage the structure or crush the existing insulation. Working in the attic requires patience: every move must be planned because the support surfaces are limited and ducts can be easily deformed if you lean in the wrong place.
Low static pressure or high static pressure: an important choice
In the GREE range offered by AirGreen, there are solutions for low static pressure ductwork and high static pressure ductwork. This distinction matters a lot.
A low pressure model is generally suitable for shorter configurations, with few outlets, few restrictions, and a simple duct network. It can be very efficient when the installation is compact, for example for a living area, a few rooms, or a well-defined section of the house.
A high static pressure model becomes relevant when ducts are longer, multiple grilles are served, the routes include bends, or when air must be pushed through a more demanding network. In a house where the attic imposes a complex routing, this option can make the difference between a system that works correctly on paper and a system that offers real comfort in the rooms.
For this project in Deux-Montagnes, the analysis of the distribution network was an integral part of the approach. A ducted HVAC installation is not just about hanging an indoor unit and connecting two ducts. It is necessary to validate air behavior, pressure losses, transitions, and final balancing.
The role of R32 in the GREE All Match Slim Duct models
The GREE All Match Slim Duct R32 series represents an interesting option for clients who want a modern, compact solution well suited for discreet installations. The refrigerant R32 is used in several recent systems and allows for good energy performance with a more current design than older generations.
For owners in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this type of system offers a concrete advantage: it combines discreet architectural integration with heating and cooling capacity suited to residential needs. Depending on the chosen model, some GREE configurations can offer good winter performance, with operating ranges designed for Quebec conditions.
In a project like this, the advantage is not only technical. It is also visual and practical. The client gets centralized comfort without multiplying wall units throughout the house. For owners sensitive to interior aesthetics, this is often the deciding factor.
What this AirGreen installation brings to comfort, efficiency, and sustainability
Better distributed comfort in the rooms
A well-installed ducted system allows for more even air distribution than a single wall unit placed in a central room. The vents can be positioned to serve the areas actually used: bedrooms, hallway, living room, open area, or entire floor, depending on the network design.
In this project, the work on the ducts was precisely aimed at optimizing this distribution. A poorly placed air outlet can create uncomfortable zones, while insufficient air return can reduce overall performance. Our teams therefore pay attention to the complete circulation: supply air, return air, pressure, noise, and accessibility for maintenance.
The comfort felt does not come only from BTU capacity. It comes from a combination: a well-chosen device, properly sized ducts, sealed connections, adequate insulation, and rigorous commissioning.
Mistakes to avoid with a ducted system
Many problems encountered in ducted installations come from rushed design. Here are the most common mistakes we avoid at AirGreen:
Underestimating static pressure
A system may have enough BTU but not enough available pressure to distribute air properly. The result is often low airflow at the farthest vents.
Using too much flexible ducting
Flexible ducting is useful, especially in difficult spaces, but it must be installed carefully. Too many bends, tight curves, or a crushed duct can harm airflow.
Neglecting the tightness of joints
Each connection must be properly sealed. A leak in an attic means that heated or cooled air is lost in an unoccupied space, which reduces efficiency and increases operating costs.
Forgetting service access
A concealed ducted system must remain accessible for HVAC maintenance, inspections, cleaning, filter replacement, and technical checks. An installation that is too compact without sufficient access can complicate after-sales service.
Choosing capacity based only on size
Two houses of the same size can have very different needs. Insulation, solar orientation, ceiling height, windows, heat loss, and the duct network influence the selection.
An installation designed for future maintenance
One of the things that distinguishes professional work is the ability to think about the next technician who will have to intervene. In this installation in Deux-Montagnes, the network organization and component positioning were approached with this logic. A ducted heat pump must be able to be inspected, cleaned, and adjusted without having to demolish a section of ceiling or move an excessive amount of insulation.
This perspective is especially important in homes where the indoor unit is installed in an attic. Filters, service panels, condensate drains, electrical connections, and refrigerant fittings must remain accessible. A system that performs well on the day of installation must also remain practical five, eight, or ten years later.
Subsidies and eligibility: what to check
Some heat pump systems may be eligible for subsidy programs, especially when the models meet applicable energy efficiency criteria. The criteria can vary depending on the exact model, indoor/outdoor combination, capacity, and the lists in effect at the time of installation.
At AirGreen, we help clients verify the available information before finalizing their choice. For GREE ducted systems, eligibility must be confirmed according to the exact installed configuration. This step is important because a product family can contain several capacities and combinations, but each case must be validated with the official data of the selected model.
For an owner in Deux-Montagnes, Laval, Montreal, Longueuil, on the North Shore or on the South Shore, this validation can have a real impact on the net cost of the project.
Why choose AirGreen for a GREE ducted project
Ducted systems require a different expertise than a standard wall installation. You need to understand the device, but also the building. You must know how to read a technical space, anticipate air behavior, work cleanly in difficult areas, and adapt the project to the real constraints of the site.
AirGreen is a GREE Elite dealer, with direct experience in low and high static pressure ducted systems. This expertise is reflected in the field by:
- a more accurate model selection;
- a better analysis of the duct network;
- a cleaner installation in attics and false ceilings;
- a genuine concern for waterproofing;
- clear support before, during, and after the work;
- a structured after-sales service;
- liability insurance coverage of 5 000 000 $;
- detailed quotes before the start of the work.
Our clients especially appreciate the transparency of the process. Before starting, we clarify the equipment, options, costs, constraints, and steps. This approach reduces surprises and allows the homeowner to understand what will be installed in their home.
A discreet solution for homes in Deux-Montagnes and the North Shore
Deux-Montagnes features a varied residential stock: single-family homes, renovations, extensions, bungalows with attics, newer constructions, and spaces where installing a wall unit is not always the best visual choice. The GREE All Match Slim Duct R32 and other GREE ducted units models can meet this diversity.
In projects where interior aesthetics are a priority, a ducted solution can be ideal. It avoids adding a wall unit in every room and allows the use of more discreet grilles. For clients who want to cool or heat several rooms from a compact central system, this approach is often more consistent.
The result: an integrated, discreet system better suited to the home
At the end of this installation, the client benefits from an integrated HVAC solution that respects the interior layout while improving thermal comfort. The work in the attic, duct connections, section insulation, joint sealing, and selection of the right type of ducted unit form a coherent whole.
This type of project clearly demonstrates the value of an installation carried out by a team experienced with real-world site constraints. In an environment like the one shown on the job site, having the right equipment is not enough. You also need the right method.
For homeowners in Deux-Montagnes, Montreal, Laval, Longueuil, the North Shore and the South Shore considering a ducted heat pump, a slim duct, a ducted system or an upgrade of their duct network, AirGreen offers a comprehensive approach: estimate, model selection, installation, commissioning, usage advice, and post-installation follow-up.