A ducted HVAC installation designed to disappear into the house, not in performance
In Saint-Eustache, this HVAC installation project led us to work in a context highly sought after by homeowners on the North Shore: achieving the comfort of a high-performance heat pump without a visible wall unit in the main rooms, thanks to a ducted solution, also called ducted ducts, Slim Duct or ductable system.
The client wanted more uniform cooling and heating, with a discreet integration into the house’s architecture. The attic offered a possible path for the ducts but also imposed several constraints: tight roof trusses, limited access, blown-in floor insulation, low slopes, and the need to preserve the thermal envelope’s efficiency. It is precisely in this type of situation that a GREE All Match Slim Duct R32 system becomes particularly interesting when properly sized, well installed, and correctly balanced.
The photo taken on site clearly illustrates the reality of the project: black flexible ducts already integrated into the attic, a dense wood structure, loose insulation, and a workspace that requires precision. This is not an installation where you can simply "run pipes" and close up. Every curve, every fastener, every drainage slope, and every connection directly affects comfort, noise, airflow, and system durability.
At AirGreen, we approach ducted installations as much a design job as an installation. Choosing the machine is not enough: you need to understand the house, the air distribution, pressure losses, service access, desired noise level, and the real needs of the occupants.
Why a GREE ducted heat pump was suitable for this house in Saint-Eustache
The main advantage of a GREE ducted heat pump is its discreet integration. The indoor unit is installed in a technical space, such as an attic, a false ceiling, or a mechanical area, then the air is distributed through a duct network to the targeted rooms. The desired result is simple: stable comfort, without a visible wall unit in the living areas.
In this house in Saint-Eustache, the client wanted to improve comfort without changing the interior appearance. A classic wall unit solution could have worked technically, but it did not fully meet the project's aesthetic and functional goals. The GREE All Match Slim Duct R32 range allows precisely this type of approach: a more integrated installation, compatible with configurations where ducts must run through tight spaces.
A flexible GREE ducted range for different residential needs
The GREE ducted units offered by AirGreen cover several capacities, including configurations of 9,000, 12,000, 18,000, 24,000, 30,000, and 36,000 BTU, depending on the home's needs, the volume to be treated, the level of insulation, solar orientation, and room distribution.
In a project like this, the choice of capacity is never made solely based on the area. Two houses of the same size in Saint-Eustache, Laval, or Montreal may require very different approaches depending on:
- the quality of attic insulation;
- the number of windows and their orientation;
- ceiling height;
- sun exposure;
- the natural air circulation;
- the number of rooms served;
- the total length of the ducts;
- the available static pressure;
- the acceptable noise level for occupants.
For this type of system, sizing is even more important than with a standard wall unit. A unit that is too weak risks running too long without reaching the desired comfort. A unit that is too strong can cause short cycles, less effective humidity control, and less stable air distribution. Our role is therefore to find the balance between capacity, static pressure, airflow, and real comfort.
The R32: a modern choice for a residential ducted installation
The GREE All Match Slim Duct R32 series uses the refrigerant R32, an increasingly common element in new generations of HVAC systems. For homeowners comparing available options in Montreal, Laval, Longueuil, on the North Shore and the South Shore, this technical detail is important because it places the installation within a sustainable modernization framework.
R32 is appreciated for its efficiency in recent heat pump systems. Combined with a well-executed installation, it provides good energy performance, a quick response to heating and cooling needs, and integration compatible with the current requirements of the Quebec residential market.
An attic installation: the invisible part that makes all the difference
Installation in an attic requires a very different method from a standard wall installation. In this house in Saint-Eustache, the space between the roof trusses required a precise routing for the ducts. The goal was not only to connect the indoor unit to the air outlets but to create a clean, efficient, and accessible distribution for future maintenance.
A poorly designed duct network can cause several problems:
- insufficient airflow in certain rooms;
- excessive blowing noise;
- losses in heating performance;
- condensation around the ducts;
- difficult access for service;
- discomfort between distant zones;
- higher than expected electrical consumption.
That is why our technicians paid special attention to the duct paths, bends, lengths, connections, and protection of the existing insulation. In an attic, every intervention must also be done without unnecessarily compacting the blown insulation, as this can reduce the home's thermal performance.
Managing flexible ducts: a detail often underestimated
In the construction site photo, you can clearly see black flexible ducts running through the attic structure. This type of duct can be very useful in a Slim Duct installation, but it must be handled with care. A duct that is too crushed, too bent, or poorly suspended can increase pressure loss and reduce the airflow available to the vents.
Our teams therefore ensure to follow essential principles:
- limit sharp bends;
- avoid compressed sections;
- properly support the lengths;
- maintain a smooth path;
- ensure the tightness of the connections;
- preserve insulation around the ducts;
- position the grilles to promote good air diffusion.
These actions are almost never seen once the work is finished, but they determine the quality of comfort for years.
Low static pressure or high static pressure: making the right choice
The GREE ducted range includes different approaches, including versions with low static pressure and high static pressure depending on the configurations. This distinction is important.
A low static pressure unit is better suited for short, simple, and less restrictive networks. It can be ideal for serving a few zones close to the indoor unit when the ducts are short and clear. A high static pressure unit may be preferable when the network is longer, when there are multiple outlets, or when the house requires a more complex distribution.
In the case of this installation in Saint-Eustache, the analysis of the attic, the length of the run, and the number of planned outlets guided the technical selection. This is not a decision we make based on a product sheet alone. We assess the site, obstacles, areas to be treated, and the overall balance of the network.
A comfortable solution for owners who do not want visible wall units
Wall-mounted heat pumps remain an excellent solution in many homes. However, some owners prefer not to have a visible unit in the living room, dining room, or bedrooms. The GREE ducted system meets this preference by distributing air through more discreet grilles.
In this house, the desired result was a more natural comfort feeling: no concentrated air jet in the same spot, no wall unit visually dominating the room, and a more even temperature in the served areas. For clients sensitive to interior aesthetics, this is often a decisive argument.
The role of balancing after installation
Once the unit is installed and the ducts connected, the work is not finished. System balancing is an essential step. It involves checking that air reaches the different outlets properly and that the distribution matches the needs of each room.
In a ducted installation, two grilles can be connected to the same unit but may not receive the same airflow if the network is not balanced. A more distant room, a longer duct, or an additional bend can create a noticeable difference. That’s why our technicians validate the system’s behavior after startup.
The goal is to deliver an installation that actually works under the home's conditions, not just a “connected” installation.
Drainage, condensation, and service access: three critical points
A Slim Duct system installed in an attic must be designed with great attention to drainage. In cooling mode, the indoor unit produces condensation. This water must be reliably drained, with an adequate slope or a pump solution when necessary.
Poor drainage management can lead to costly problems: infiltration, ceiling stains, moisture in the attic, or system shutdown due to safety protection. To avoid this, we check slopes, access points, connections, and the logic of the drainage path.
Service access is also a major factor. A very compact installation may seem neat at first, but become problematic if no clearance has been planned for maintenance. At AirGreen, we think ahead from the installation stage about future interventions: cleaning, diagnostics, inspection, component replacement, connection checks, and HVAC maintenance.
Winter performance and the reality of the North Shore climate
In Saint-Eustache, winters can put HVAC systems to the test. The selection of a heat pump must therefore take into account cold temperatures, defrost cycles, the positioning of the outdoor unit, and the actual heating capacity when the temperature drops.
The GREE range includes models designed to operate in demanding winter conditions, with some units capable of delivering suitable performance down to very low temperatures depending on the selected model. In a residential project on the North Shore, this factor must be seriously considered, especially when the system is intended to contribute to heating and not just summer air conditioning.
The location of the outdoor unit is just as important: sufficient clearance, protection against excessive snow accumulation, service access, stable support, and defrost water management. An excellent unit can lose efficiency if it is poorly positioned.
Common mistakes to avoid with a ducted system
Through our installations in Montréal, Laval, Longueuil, on the North Shore and the South Shore, we often see the same mistakes in poorly planned ducted system projects.
The first is underestimating static pressure. A duct network creates resistance. If the device is not selected for this reality, the airflow may be insufficient.
The second is neglecting duct insulation. In an attic, temperature differences can be significant. Poorly insulated ducts can cause energy loss and condensation.
The third is trying to serve too many rooms with a single small unit. A ducted system is not magic: it must be sized according to precise criteria.
The fourth is placing the grilles without thought. A poorly positioned grille can blow directly onto a bed, create a cold zone, or leave a room less comfortable.
The fifth is not planning for maintenance. A system that is hard to access often becomes a poorly maintained system.
AirGreen's experience in discreet and complex installations
This project in Saint-Eustache falls into a category of installations where the team's experience matters a lot. Ducted systems require coordination between equipment selection, structural reading, duct installation, refrigeration connection, drainage, electricity, and commissioning.
Our teams regularly carry out projects where the available space is limited: condos in Montréal, single-family homes in Laval, renovation projects on the South Shore, installations in attics on the North Shore, or configurations with particular architectural constraints in Longueuil. This experience allows us to anticipate problems before they become costly fixes.
In recent reviews from our customers, several elements often come up: clarity of explanations, cleanliness of the site, punctuality, quality of installation, and the ability to propose solutions where other contractors only see limits. For a ducted installation, this adaptability is essential.
A clean installation, but above all measurable
A good installation is not just about appearance. For a GREE All Match Slim Duct R32 system, we want the result to be measurable: good airflow, good comfort, stable operation, safe drainage, controlled noise, and reasonable access for service.
In this project, the attic installation was carried out with particular attention to protecting the structure and insulation. The ducts were arranged to promote efficient air circulation while respecting the physical constraints of the attic space. The connections were checked, passages optimized, and commissioning performed to confirm the system's proper operation.
Subsidies and eligibility: a point to verify according to the exact model
Homeowners considering a GREE ducted heat pump often ask if the system qualifies for a subsidy, especially under programs available in Quebec. The answer depends on the exact model, the indoor-outdoor combination, the certified efficiency, and the criteria in effect at the time of installation.
At AirGreen, we help customers validate the relevant information for their project. For eligible systems, we provide the necessary documents so the customer can complete their application according to the requirements of the applicable program. This step is particularly important for homeowners comparing several heat pump options, as the net cost after subsidy can influence the final decision.
Who is a GREE ducted solution suitable for?
A GREE ducted installation is especially suitable for homeowners who want:
- discreet comfort without a visible wall unit;
- a more uniform air distribution in several rooms;
- a solution compatible with an attic, a false ceiling, or a mechanical space;
- a modern system using R32 according to the chosen range;
- a clean and integrated HVAC installation;
- an option suited for homes on the North Shore, in Montreal, Laval, Longueuil, and the South Shore.
It is less suitable for projects where no duct passage is possible, where service access would be too limited, or when the budget does not allow for proper network design. In these cases, a wall unit, a multi-zone, or another configuration may sometimes be more logical.
The result for the client from Saint-Eustache
At the end of the project, the client obtained a discreet comfort solution integrated into the house structure, with air distribution designed for the targeted rooms. The goal was not simply to add an HVAC unit, but to create a system that respects the interior aesthetics, improves daily comfort, and remains accessible for maintenance.
This installation clearly illustrates why ducted systems require a more technical approach than a standard installation. Much of the work takes place in spaces the owner almost never sees: attic, ducts, connections, insulation, drainage, and adjustments. But it is precisely there that the quality of comfort felt in the living spaces is determined.
At AirGreen, we recommend this type of solution when the house is truly suitable and when the client is looking for a discreet, durable, and well-designed finish. For homeowners in Saint-Eustache, the North Shore, Montreal, Laval, Longueuil, or the South Shore, a GREE All Match Slim Duct R32 ducted heat pump can be an excellent option, provided it is installed with method, precision, and a full understanding of the air network.