A wall unit installed in a narrow technical space: a precise HVAC project in Sainte-Rose
In Sainte-Rose, in the northern sector of Laval, AirGreen carried out a HVAC installation that clearly demonstrates the importance of adaptation on site. The project involved a GREE FREE MATCH R32 DoubleZone heat pump, configured in 2 zones with 2 wall units, to improve the comfort of two distinct spaces in the building.
The photo shows one of the wall units installed in an indoor environment that is far from a perfectly clear showroom wall. We are here in a basement-type area, workshop, storage, or technical space, with a concrete block wall, a low beam on the ceiling, a nearby window, a lower wall-mounted electric heater, and an existing structure that strongly limits installation options.
This type of project requires a very different approach from a standard installation in a finished living room. Consideration must be given to the available height, the strength of the support, air clearance, the routing of refrigerant lines, condensation drainage, vibration, maintenance access, and the durability of the mounting. In this specific case, the GREE wall unit was installed on a wooden support designed to provide a stable attachment in front of the concrete block wall, while respecting the necessary clearances around the unit.
The result is a functional installation, well positioned and adapted to an environment where every centimeter counted.
Why a GREE FREE MATCH R32 DoubleZone heat pump was suitable for this building
The GREE FREE MATCH R32 is a multi-zone solution that allows connecting two indoor units to a single outdoor unit, depending on the selected combination. For this project in Sainte-Rose, this DoubleZone configuration was particularly relevant because the client wanted to treat two zones without unnecessarily multiplying outdoor equipment.
A 2 zones, 2 heads system offers several advantages in a residence or a small building:
- each space can receive more targeted treatment;
- a single outdoor unit can power two wall units;
- comfort can be adjusted according to the actual use of the rooms;
- Inverter technology allows for more stable modulation;
- the installation can be adapted to existing buildings without central ducts;
- the system can be used for both air conditioning and supplemental heating, depending on conditions and configuration.
In many homes in Laval, especially in Sainte-Rose, Chomedey, Vimont, Duvernay, and Laval-des-Rapides, interior spaces are not always uniform. Some basements are cooler, some upstairs rooms overheat in summer, and some house extensions do not receive the same comfort as the rest of the building. A well-designed DoubleZone system can address this reality.
A concrete block wall: solid, but not always easy to work with
In the photo, the wall unit is installed in front of a concrete block wall. This type of surface may seem ideal because it is sturdy, but in practice, it requires a precise method. The blocks can be hollow, irregular, old, or already weakened by previous work. Direct fastening without analysis can cause alignment, vibration, or long-term durability problems.
In this project, our team used wooden supports to create a stable base adapted to the position of the wall unit. This approach compensated for the wall constraints, respected the optimal location of the unit, and maintained adequate clearance from the beam above.
This detail is important. A wall-mounted heat pump must be installed level, securely fixed, and placed to allow good air circulation. If the unit is too close to a beam, too low, too tilted, or poorly supported, comfort can be affected, and maintenance becomes more difficult.
The main constraint: a low beam above the unit
One of the visible challenges of this installation is the presence of a beam or soffit very close to the ceiling. The wall unit had to be positioned quite high to distribute the air well, but not too close to the upper obstacle. A poor position could have limited air intake above the device or reduced distribution efficiency.
During the installation, we therefore evaluated:
- the upper clearance of the indoor unit;
- the direction of the airflow;
- access to the cover and filters;
- the possibility to remove and clean the filters;
- alignment with the path of the refrigerant lines;
- the necessary slope for the condensation drain;
- interaction with the window and other wall elements.
In a finished room, the choice of location is often dictated by aesthetics. In this space, it was mainly about finding the balance between performance, access, and physical constraints. This is exactly the kind of decision that distinguishes a professional installation from a simple mechanical setup.
The importance of drainage in a basement or technical space
A wall head produces condensation when operating in cooling mode. This water must be reliably drained. In a basement or technical space, drainage must be planned with even more care because a mistake can cause water stains, humidity, or damage to surrounding surfaces.
For a HVAC installation like this one, we pay special attention to the drain slope, the exit point, protection against blockages, and future access for inspection. If a drainage pump is necessary in some configurations, it must be properly selected and installed. In other cases, gravity drainage may be possible, but only if the path actually allows it.
The client does not always see this part of the work, but it is essential. A wall head that cools well but drains poorly quickly becomes a source of problems. At AirGreen, we therefore treat drainage as a central part of the installation, not just a simple detail.
A wall head in an unfinished space: why finishing remains important
Even if the installation is in an unfinished space, our team maintains a clean finishing logic. The goal is to deliver a stable, accessible system consistent with the room's use. The supports must be straight, the unit well aligned, the lines protected, and the technical elements must remain accessible.
In this project in Sainte-Rose, the environment showed signs of previous work on the ceiling and wall. This does not change our way of working. On the contrary, in a less finished space, a well-structured installation becomes even more important because it reduces the risk of future damage and makes adjustments easier if the client decides to renovate the room later.
The role of the GREE FREE MATCH R32 in daily comfort
The GREE FREE MATCH R32 model is designed for multizone installations. It allows more flexible comfort management, especially when dealing with two spaces with different needs. In a residence, this can mean one head in the basement and another upstairs, one head in a family area and another in a bedroom, or a combination adapted to an extension or a workspace.
Thanks to Inverter technology, the system adjusts its operation according to demand. This modulation helps limit sudden temperature changes and improves perceived comfort. For homeowners, this often translates into a more stable temperature, better humidity control in summer, and more flexible use during cooler periods.
The refrigerant R32 is part of the new generation of solutions used in many modern heating and air conditioning systems. It is valued for its thermal performance and integration into recent equipment. As with any system, actual performance depends on the installed combination, sizing, quality of connections, vacuum pulling, and commissioning.
Subsidies: a verification based on the exact combination
For a DoubleZone heat pump, the issue of subsidies must always be handled precisely. Eligibility does not depend only on the commercial name of the model. It depends on the exact combination of the outdoor unit, the two indoor units, the certified capacity, the energy efficiency, the AHRI number, and the criteria of the current program.
That’s why AirGreen supports its clients in verifying important documents. For installations in Montreal, Laval, Longueuil, on the North Shore and the South Shore, we know that clients want to understand not only the total project price but also the potential cost after subsidy. This step must be clear before purchase, especially in the case of multizone systems.
Mistakes to avoid in a complex indoor installation
This project in Sainte-Rose illustrates several common mistakes that we help our clients avoid.
The first is to choose a location only because it is convenient for running lines. A wall head must also blow well into the room, remain accessible, and respect the manufacturer's clearances.
The second is to underestimate wall support. On a concrete, brick, or block wall or in an unfinished room, the mounting must be adapted. A poorly anchored indoor unit can vibrate, move, or create noise over time.
The third is to neglect drainage. In a basement, poor drainage can cause more inconvenience than in a main room because problems can go unnoticed for longer.
The fourth is to forget maintenance. Even in a technical space, filters must remain accessible. A client must be able to open the panel, remove the filters, and perform basic cleaning without dismantling the installation.
An AirGreen method adapted to the real buildings of Laval, Montreal, and the greater area
At AirGreen, we carry out installations of wall-mounted heat pumps, wall air conditioners, DoubleZone, TripleZone, and multi-zone systems in very varied contexts. Some projects take place in recent condos with perfectly finished walls. Others happen in basements, workshops, Montreal multiplexes, older houses, or buildings where every technical passage must be carefully planned.
This installation of a GREE FREE MATCH R32 DoubleZone in Sainte-Rose clearly shows our way of working: we start from the actual building, not an ideal scenario. We observe the constraints, adjust the method, and install the system in a way that protects performance, safety, and durability.
A local approach for Sainte-Rose clients
Sainte-Rose has several types of buildings: single-family homes, duplexes, renovated bungalows, finished basements, converted storage spaces, and older properties. In these environments, installing a heat pump often requires more judgment than a simple standard replacement.
Our team knows how to adapt HVAC solutions to local constraints:
- concrete block walls or old structures;
- low ceilings;
- limited exterior access;
- restricted mechanical spaces;
- different needs between floors;
- noise constraints;
- requests for discreet finishing;
- requirements related to subsidies and documentation.
The client thus benefits from a system that meets their real needs, rather than a generic installation.
Practical advice for owners considering a DoubleZone heat pump
Before installing a DoubleZone heat pump, it is useful to precisely identify the two zones to be treated. Note rooms that are too hot in summer, too cold in winter, places where air circulates poorly, and spaces most frequently used. This information helps choose the right units, the right location, and the right configuration.
It is also important to think about the future. An unfinished basement can be renovated later. A storage room can become an office. A workshop can become a family room. The installation must therefore remain logical even if the use of the room changes. In this project, the wall unit was installed to remain accessible and useful while respecting existing constraints.
A DoubleZone installation designed to last
This HVAC installation in Sainte-Rose shows that a good project is not just about the brand of equipment. The GREE FREE MATCH R32 is an excellent base for a 2-zone setup, but it is the quality of the installation that determines long-term satisfaction.
The wall mount, alignment, drainage, clearances, commissioning, and explanation to the client are all crucial elements. Once properly installed, a DoubleZone heat pump can significantly improve the comfort of a residence, especially when needs differ from one zone to another.
In Sainte-Rose, this installation perfectly reflects the work of AirGreen: a solution adapted to the building, precise execution, special attention to visible constraints, and a professional approach applied equally to finished spaces and technical rooms. For owners in Laval, Montreal, Longueuil, the North Shore, and the South Shore, it is this level of detail that transforms a simple heat pump installation into a true sustainable comfort solution.