In Saint-Alexandre, an installation where technical details matter just as much as the choice of heat pump
A wall-mounted heat pump can be highly efficient on paper, but its actual performance also depends on the quality of its installation. For this project completed in Saint-Alexandre, we worked with a Fujitsu AIRSTAGE Altair 500, a series of single-zone systems using R-32 refrigerant and designed to provide both summer cooling and heating through much of the Quebec winter.
A detail visible in the photo of this installation nicely sums up how we work at AirGreen: a level is placed directly on top of the Fujitsu outdoor unit during installation. This small gesture is not decorative. It is part of the checks that help ensure the unit is properly positioned before considering the work complete.
For a home with vinyl siding like this one, the goal is not simply to place the condenser in the easiest-to-access location. We must consider airflow, clearance around the unit, the routing of the refrigerant lines, drainage, access for future maintenance, and the overall appearance of the HVAC installation.
Fujitsu AIRSTAGE Altair 500: a range of R-32 wall-mounted heat pumps
Fujitsu’s technical documentation presents the AIRSTAGE Altair 500 H Series as a single-zone range comprising the 09KPAS1, 12KPAS1, 18KPAS1, 24KPAS1, 30KPAS1, and 36KPAS1 capacities. Depending on the model, the rated cooling capacity ranges from 9,000 to 33,000 BTU/h, while the rated heating capacity varies from 10,000 to 34,000 BTU/h.
The photo of our project in Saint-Alexandre clearly identifies the Fujitsu AIRSTAGE R32 platform, but the nameplate showing the exact capacity of this installation is not visible. We therefore prefer not to arbitrarily assign a BTU rating to the system shown in the photograph.
This distinction is important. A good heat pump company in Saint-Alexandre, on the South Shore, or in Greater Montreal should never determine an appliance's capacity solely from its external appearance. Sizing must correspond to the building, the area actually served, its insulation, solar exposure, number of floors, and several other characteristics.
A series designed for cooling and heating
The Altair 500 series is not simply a wall-mounted air conditioner with a heating function added. It is an Inverter heat pump capable of modulating its operation to respond more gradually to the home's needs.
According to the Fujitsu data sheet, the stated heating operating range for models in this series extends down to -15 °C. The documentation also indicates, for certain models, a special operating mode that allows certain outdoor-unit operating conditions to be extended, particularly in cooling mode.
For a Quebec homeowner, this feature must be interpreted correctly. A minimum operating temperature does not automatically mean that the heat pump must single-handedly replace all other heating methods in a building during every cold spell. The system should always be selected based on the actual configuration of the residence and the desired heating strategy.
R-32: an important element of this new generation of Fujitsu systems
The inscription R32 is clearly visible on the outdoor unit photographed in Saint-Alexandre.
Fujitsu indicates that R-32 has a global warming potential, or GWP, of 675, compared with 2,088 for R-410A, representing a stated reduction of 68%. The manufacturer also specifies that R-32 equipment can operate with a reduced amount of refrigerant while maintaining the desired performance.
For us, the arrival of R-32 in Fujitsu wall-mounted heat pumps also entails a very concrete requirement: the installation procedures, refrigerant handling, and work tools must correspond to the characteristics of the installed system.
It is therefore not enough to replace an old unit with a new machine and automatically assume that all the practices from the old installation are still appropriate.
A perfectly level installation: why this check deserves our attention
In the photo of this project, the spirit level placed on the outdoor unit shows a very simple step in our installation inspection.
We check the condenser’s position because an outdoor unit must remain stable throughout the seasons. In Saint-Alexandre as well as Montreal, Laval, Longueuil, the North Shore, and the South Shore, an outdoor unit is exposed to much harsher conditions than equipment installed in a temperate climate: rain, snow, ice, freeze-thaw cycles, significant temperature variations, and possible water accumulation around the property.
An installation that appears correct on the day of the work can become problematic if its support shifts over time.
This attention to level and stability helps us ensure a clean, predictable, and accessible installation. The prescribed clearances must also be maintained, and the support must not shift in a way that places unnecessary strain on the refrigerant lines.
A compact outdoor unit near a vinyl-sided wall
The photographed project shows a common situation in our work: an outdoor unit installed near a residential wall covered with vinyl siding.
This context requires several decisions to be made before proceeding with the final connection.
You need to consider where the lines will exit, how they will be protected outdoors, how the drainage will be arranged, and what access must remain available for any future HVAC maintenance or technical service.
We also aim to avoid an unnecessarily bulky installation. The Altair 500 series uses an outdoor unit design that Fujitsu describes as compact, with different allowable piping lengths depending on the unit’s capacity.
For the 9,000 and 12,000 BTU models, Fujitsu indicates, for example, a maximum piping length of 20 m, or 66 ft. This increases to 30 m, or 98 ft, for the 18,000 and 24,000 BTU models, then to 50 m, or 164 ft, for the 30,000 and 36,000 BTU models.
This flexibility can be very useful when a homeowner does not necessarily want the outdoor unit placed directly behind the indoor wall-mounted unit.
Pipe diameters that vary according to capacity
One mistake we take particular care to avoid when replacing an older wall-mounted heat pump is assuming that the existing lines necessarily have the correct dimensions for the new equipment.
The Altair 500 specifications illustrate this issue very well.
For this range, Fujitsu specifies:
- 9,000 and 12,000 BTU: 1/4-in. liquid line and 3/8-in. gas line;
- 18,000 and 24,000 BTU: 1/4-in. liquid line and 1/2-in. gas line;
- 30,000 and 36,000 BTU: 3/8-in. liquid line and 5/8-in. gas line.
This is essential information when carrying out a heat pump installation or replacing an older system.
Reusing a line simply because it is already in the wall is not always the best solution. We must first confirm its size, condition, and compatibility with the selected model.
A suitable power supply for each capacity
The same logic applies to the electrical system.
The different Altair 500 capacities do not all require the same circuit breaker. Fujitsu specifies a 208–230 V, 60 Hz, single-phase power supply, but the electrical protection requirements vary by system: 15 A for the 9,000, 12,000, and 18,000 BTU models, 20 A for the 24,000 BTU model, and 30 A for the 30,000 and 36,000 BTU models.
That is why we verify the available electrical capacity before installation rather than discovering an incompatibility once the heat pump is already in place.
Particularly quiet indoor operation on smaller-capacity models
Noise is one of the criteria most often considered when choosing a wall-mounted air conditioner or heat pump.
The Fujitsu Altair 500 series offers several fan speeds, in addition to automatic mode. The 9,000 and 12,000 BTU models can operate as quietly as 19 dB(A) in quiet cooling mode, according to the manufacturer’s specifications. For higher capacities, the minimum sound level gradually increases according to the required airflow.
This is a particularly relevant detail for installation in a bedroom, office, or living space where the heat pump operates for long periods.
Comfort depends not only on the temperature shown on the remote control. Good air circulation, stable modulation, and low noise levels can make a significant difference in everyday use.
What this Fujitsu Altair 500 installation in Saint-Alexandre shows about our approach at AirGreen
We do not consider installing the outdoor unit a secondary detail
When a customer reviews a quote for a wall-mounted heat pump installation, their attention often focuses on the brand, BTUs, and price. Yet much of the final quality depends on less visible decisions.
On this Saint-Alexandre project, the level check photographed during the installation represents exactly this type of work.
We take into account the unit support, required clearances, line routing, and the possibility of returning to service the system without having to dismantle an unnecessarily complex installation.
We check the model specifications before deciding how to install it
The Altair 500 range offers several different combinations.
A 12,000 BTU system does not necessarily use the same lines, circuit breaker, or settings as a 30,000 BTU model. Even within a single Fujitsu family, it is therefore necessary to work with the technical specifications corresponding precisely to the selected equipment.
This is particularly important during a replacement.
An existing refrigerant line, old wiring, or an outdoor unit location should never be kept solely to save a few steps. We first assess whether they truly meet the requirements of the new Fujitsu heat pump.
Inverter technology: more than a brochure talking point
Fujitsu describes the Altair 500 as a system using an Inverter compressor. The principle is to adjust operation rather than operate solely according to a full-capacity on-off logic.
In practice, this modulation can help the system maintain a more consistent temperature when the heat pump is properly sized and installed.
That is precisely why oversizing is not necessarily an advantage. Choosing far more BTUs “to be safe” can result in operation that does not match the actual needs of the room or home.
For our HVAC installations in Montreal, Laval, Longueuil, the North Shore, the South Shore, and municipalities such as Saint-Alexandre, we seek to match the system's capacity to the building rather than automatically choosing the largest unit available.
ProCore and Hydro Fin: features focused on durability
The Altair 500 series documentation also highlights highly corrosion-resistant copper ProCore coils and a heat exchanger using Hydro Fin fins to improve corrosion resistance and durability.
These features are particularly valuable in Quebec, where the outdoor unit is exposed to varying conditions year after year.
However, they do not replace maintenance.
A heat pump must be able to breathe properly. Homeowners should prevent excessive accumulation of leaves, debris, or snow around the outdoor unit and keep the indoor filters clean in accordance with the manufacturer's recommendations.
Wi-Fi control: a possibility, not a feature to assume
It is also important to be precise when discussing connected features.
Fujitsu documentation indicates that the Altair 500 platform can be used with various controllers and that Wi-Fi connectivity with the AIRSTAGE Mobile app is available with a compatible USB WLAN adapter. Several other control interfaces are also available as options.
We always prefer to verify which accessories are actually included or installed rather than presenting Wi-Fi as a feature automatically built into every configuration.
Mistakes to avoid when installing a Fujitsu heat pump
A quality installation often begins with what we refuse to do.
In particular, we avoid selecting capacity based solely on approximate floor area, assuming that the existing piping is compatible, overlooking electrical requirements, placing the outdoor unit where it will be difficult to service, or completing the work without verifying its stability and positioning.
The photo of this Fujitsu AIRSTAGE Altair 500 in Saint-Alexandre illustrates one of these basic checks: the unit is inspected with a level before the work is finalized.
This is just one step among several, but it illustrates the difference between simply placing a machine beside a house and completing a professional HVAC installation.
A suitable heat pump should be selected based on the building, not just its SEER2 rating
The energy performance of the Altair 500 series varies by capacity. The documentation indicates SEER2 values of up to 26.0 for the 9,000 BTU model, 24.0 for the 12,000 BTU model, and different values for the higher capacities. ENERGY STAR ratings also vary by model.
These data are useful for comparing equipment, but we avoid reducing the choice of a heat pump to a single figure.
A highly efficient machine that is incorrectly sized, poorly positioned, or installed on inadequate infrastructure will not deliver the desired experience.
We therefore look at the project as a whole: capacity, performance, piping, electrical supply, indoor unit location, outdoor condenser location, noise, access, drainage, and the intended use of the system.
AirGreen: Fujitsu heat pump installation in Saint-Alexandre and the Greater Montreal Area
This Fujitsu AIRSTAGE Altair 500 installation in Saint-Alexandre is a good example of what we aim to reproduce in each of our projects: a machine suited to its environment and workmanship in which even details that may seem simple are checked.
We carry out wall-mounted heat pump installations, replacements of existing systems, and various HVAC projects in Montreal, Laval, Longueuil, on the North Shore and the South Shore.
For a homeowner currently comparing several Fujitsu systems or hesitating between different heat pump capacities, our recommendation is not to start solely with the number of BTUs or the listed price.
The house must be assessed first.
Next, we can determine which capacity is suitable, where to install the units, which piping route is appropriate, and which electrical or architectural constraints must be addressed before the technicians arrive.
It is this preparation, combined with concrete on-site checks like the one seen at our installation in Saint-Alexandre, that makes it possible to truly benefit from a Fujitsu Altair 500 wall-mounted heat pump.