A FUJITSU installation in Saint-Alexandre adapted to a brick wall, an irregular ceiling, and limited space
This AirGreen installation in Saint-Alexandre, in Montérégie clearly shows why installing a wall-mounted heat pump is not simply a matter of choosing an open wall and attaching an indoor unit to it. The building often imposes its own constraints: existing masonry, tight corners, irregular ceilings, limited routes for refrigerant piping, and the need to maintain good air distribution throughout the room.
The photo of this project is particularly revealing. The FUJITSU AIRSTAGE ORION XLTH+ indoor unit is installed very high on a white-painted brick wall, practically at the meeting point of an interior corner. The ceiling does not have perfectly uniform geometry, so the space available around the heat pump required more precise planning than an installation on a simple, unobstructed drywall wall.
We also worked on routing the piping with a white finishing line set cover, visible below and beside the unit. In this type of architectural environment, the goal is twofold: meet the system’s technical requirements while avoiding turning the refrigerant piping, wiring, and drainage into visually dominant elements.
The result is a compact installation where the FUJITSU ORION XLTH+ heat pump integrates into the existing architecture rather than working against it.
Why this Saint-Alexandre project required careful consideration of the location
An interior brick wall presents different challenges from a conventional partition wall.
When a wall-mounted unit must be installed on or in front of masonry, we must consider the nature of the support, the routing of the piping, and how the finishing elements can follow the building’s irregularities.
Several constraints are visible in this installation:
- the presence of a painted brick wall;
- a very high installation;
- a ceiling with unusual geometry;
- a wall corner immediately to the right of the unit;
- a piping route that had to remain clean despite the existing architecture;
- an obvious need to preserve the louver’s full opening.
These are precisely the details that distinguish a true HVAC installation from simply mounting equipment.
The unit had to remain functional despite its proximity to the corner
In the photo, the FUJITSU unit is relatively close to the perpendicular wall on the right.
The placement of a wall-mounted heat pump must always take air movement into account. Installing an indoor head in a corner without considering the airflow path can impair temperature distribution in the room.
Here, the lower flap is completely open and the airflow area remains unobstructed. The unit can therefore project air into the available space rather than directly against an obstacle positioned a few centimeters in front of it.
This is particularly important in heating, since comfort depends not only on the temperature of the air produced. It also depends on that air's ability to circulate effectively throughout the occupied area.
A FUJITSU ORION XLTH+ designed for Quebec's cold climate
The FUJITSU AIRSTAGE ORION XLTH+ series belongs to Fujitsu's single-zone wall-mounted range designed for heating in cold climates.
The technical documentation provided by Fujitsu indicates heating operation down to -30 °C, a feature directly relevant to installations in Saint-Alexandre, as well as in Montreal, Laval, Longueuil, the North Shore, and the South Shore.
This operating range clearly distinguishes the ORION XLTH+ from a wall-mounted air conditioner intended primarily for summer cooling.
We are talking here about a true cold-climate wall-mounted heat pump, designed to make a serious contribution to heating the home during much of the Quebec winter.
Three capacities, but a remarkably uniform indoor format
The range includes three main configurations:
- 09KTAP1, with a nominal cooling rating of 9,000 BTU/h;
- 12KTAP1, with a nominal rating of 12,000 BTU/h;
- 15KTAP1, with a nominal rating of 14,500 BTU/h.
The combinations are as follows:
9,000 BTU model
Indoor unit ASUH09KTAS with outdoor unit AOUH09KTAP1.
12,000 BTU model
Indoor unit ASUH12KTAS with outdoor unit AOUH12KTAP1.
15,000 BTU commercial-grade model
Indoor unit ASUH15KTAS with outdoor unit AOUH15KTAP1, with a published nominal cooling capacity of 14,500 BTU/h.
The photo from Saint-Alexandre is not clear enough to read the unit's label and confirm which of these three capacities was installed. We therefore avoid artificially assigning a BTU rating to this project.
What is interesting, however, is that all three indoor units share the same general format: approximately 35 3/16 in. wide, 11 5/8 in. high, and 11 in. deep.
In a space as constrained as the one shown in this installation, this compact format becomes a real advantage.
Heating performance that changes how BTUs should be compared
A homeowner shopping for a heat pump often sees references to “9,000 BTU,” “12,000 BTU,” or “15,000 BTU” and may naturally assume that these also represent the exact heating capacity.
That is not the case with this range.
The technical data sheet indicates nominal heating capacities of:
- 12,000 BTU/h for model 09;
- 15,300 BTU/h for model 12;
- 17,400 BTU/h for model 15.
The advertised maximum capacities reach 24,000, 27,300, and 28,000 BTU/h, respectively, depending on operating conditions.
This illustrates an important reality when comparing heat pumps: the nominal cooling capacity tells only part of the story.
For a residence in Saint-Alexandre, we are just as interested in how the system performs at -15 °C, -20 °C, or even colder temperatures.
At -30 °C, the ORION XLTH+ officially continues to operate in heating mode
Fujitsu publishes a heating range of -30 °C to 24 °C for all three models in the series.
The documentation also indicates the maximum percentage of heating capacity retained relative to the nominal capacity.
At -30 °C, Fujitsu states:
- 113 % for the 09KTAP1;
- 103 % for the 12KTAP1;
- 101 % for the 15KTAP1.
At -26 °C, the figures are respectively 147%, 128%, and 116%.
These figures must be interpreted correctly. They do not mean that a heat pump in this range can automatically replace any other heating system in any home. The actual result always depends on the building's heat load, its insulation, fenestration, the area served, room distribution, and the selected capacity.
Proper sizing remains more important than the “bigger is better” reflex
A common mistake is to choose a heat pump primarily based on the home's floor area, then add a substantial margin “just to be sure.”
A larger unit is not automatically more comfortable.
At AirGreen, our analysis takes into account, among other factors:
- the floor area actually accessible to the airflow;
- the number of floors;
- the quality of the insulation;
- the number of windows;
- exterior walls;
- ceilings and unusual room volumes;
- air infiltration;
- whether the home has an open or partitioned layout;
- of the heating system already in place;
- of the actual use of the different rooms.
In a building with architecture like that seen in the Saint-Alexandre project, the layout of the space can be just as important as the total number of square feet.
What this AirGreen installation reveals about the quality of a wall-mounted heat pump project
The finishing line-hide is not a minor detail
Under the indoor unit, we can see the cover that conceals the connections required for the system to operate.
In a wall-mounted heat pump installation, several components may need to run between the indoor and outdoor units:
- copper refrigerant lines;
- communication wiring;
- power supply according to the configuration;
- condensate drainage.
Without planning, these elements can quickly become highly visible.
On this project, the white line-hide follows the surroundings relatively discreetly and blends in with the painted brick wall.
This finish is particularly important in rooms where the unit is installed in an area visible on a daily basis.
1/4 in. and 3/8 in. refrigerant lines
The ORION XLTH+ also features a highly useful technical characteristic for installers and homeowners considering equipment replacement.
For the three capacities in this range, Fujitsu specifies:
- 1/4 in. for the liquid line;
- 3/8 in. for the gas line.
The published minimum piping length is 10 feet, while the maximum length can reach 66 feet, with a maximum vertical difference of 49 feet.
This data becomes crucial when an older installation already has lines running through the walls.
We never assume that existing piping is compatible with a new system simply because it is already in place. Its dimensions, condition, previous refrigerant, and configuration must be verified.
An R32 refrigerant with a significantly lower GWP than R410A
This generation of FUJITSU heat pump uses R32.
In the series documentation, Fujitsu indicates a global warming potential of 675 for R32, compared with 2,088 for R410A, representing an announced reduction of 68%.
The choice of refrigerant is not merely a line on a technical specification sheet. It also affects work methods, installation procedures, and certain service requirements.
That is why new generations of HVAC equipment must be installed and serviced using methods suited to their design.
Particularly high energy efficiency
The performance data for the ORION XLTH+ are also important for a homeowner comparing several wall-mounted heat pumps.
Fujitsu indicates the following TRÈS2 values:
- 33,5 for model 09;
- 31,5 for model 12;
- 28,7 for model 15.
The technical specifications also associate all three units with the ENERGY STAR, ENERGY STAR Cold Climate, and ENERGY STAR Most Efficient 2025 classifications.
These certifications are useful criteria when comparing equipment and may also be relevant for certain financial assistance programs. However, actual eligibility for a grant must be confirmed based on the specific model, installation, and program conditions in effect at the time of the project.
Inverter technology: producing what the room actually needs
Inverter technology allows the compressor to modulate its capacity.
Rather than operating exclusively according to a full-power/on-off logic, the heat pump can adjust its output when demand becomes lower.
In a room like the one photographed in Saint-Alexandre, this can help maintain a more consistent temperature once the setpoint is reached.
This modulation is also relevant in spring and fall, when heating and cooling needs can vary quickly over the course of a single day.
An indoor unit that can operate at only 23 dB(A)
Noise is one of the criteria homeowners notice immediately after a new installation.
The 09 and 12 models of the ORION XLTH+ can operate as quietly as 23 dB(A), while model 15 is rated at 26 dB(A) in the same mode.
The unit has six fan speed levels in addition to the automatic setting.
This ability to operate at low speed becomes especially interesting when the heat pump is installed in an area where occupants spend a lot of time.
The visible air distribution in the photograph
The jobsite photograph shows the unit in operation, with its large lower louver open.
The technical specifications indicate automatic vertical air direction, while horizontal adjustment is manual.
The maximum airflow varies according to capacity and can reach:
- 820 m³/h for the model 09;
- 870 m³/h for the model 12;
- 930 m³/h for the model 15.
These data remind us why we need to leave enough space in front of the indoor unit. A heat pump may have excellent airflow on paper, but its distribution efficiency will be reduced if its air stream immediately encounters a beam, cabinet, or wall.
The washable filter and future access for maintenance
An installation should not only look good on the day our technicians leave the job site.
It must also allow for proper HVAC maintenance.
Fujitsu equips this range with a washable air filter.
In practice, the filters must remain clean so that airflow is not unnecessarily restricted. Over time, more thorough maintenance of the evaporator, fan, and drainage system may also be required.
That is why we consider future access when selecting the location.
The ProCore copper coils
The ORION XLTH+ indoor unit also incorporates ProCore copper coils, which Fujitsu describes as being designed with high corrosion resistance.
This type of feature is located behind the casing and is therefore not visible in an installation photograph.
Yet when we compare several systems for our customers in Saint-Alexandre, Montréal, Laval, Longueuil, North Shore and South Shore, it is precisely these design differences that can make the comparison more meaningful than a simple price comparison.
Integrated Wi-Fi adds convenient remote management
Fujitsu indicates integrated Wi-Fi connectivity with access to remote monitoring features through the AIRSTAGE app.
For a homeowner, this makes it easier to manage the temperature without constantly being in front of the physical remote control.
The platform also offers several options for additional controllers and interfaces, including certain BACnet and Modbus integrations intended for more advanced management applications.
Electrical requirements vary according to the selected capacity
The electrical supply must always be verified before the final equipment order.
For this series, Fujitsu specifies a 208 to 230 V, 60 Hz, single-phase power supply.
The specified circuit breakers are:
- 15 A for the 09KTAP1;
- 20 A for the 12KTAP1;
- 20 A for the 15KTAP1.
A preliminary assessment therefore helps avoid choosing a heat pump without verifying whether the existing electrical installation can accommodate the planned configuration.
Features designed for winter, not just air conditioning
The outdoor section of the ORION XLTH+ includes several features that are particularly relevant to our climate.
Fujitsu specifically mentions:
- a base pan heater designed for extreme cold conditions;
- an automatic defrost function;
- a low-noise outdoor mode;
- heating operation down to -30°C;
- an Inverter compressor;
- a compact outdoor design.
When we install a heat pump in Saint-Alexandre, we therefore never consider only the appearance of the photographed indoor unit. The quality of the project depends just as much on the positioning of the outdoor unit, its height above the snow, its clearance, and how the water produced during defrosting can be drained.
Mistakes to avoid when a wall seems difficult
An unusual room can sometimes lead to compromises being made too quickly.
Installing the head unit too low simply to make the work easier
A unit that is easier to install is not necessarily a unit that is better positioned. Air distribution must be considered first.
Running the lines without planning their appearance
On a painted brick wall like the one in Saint-Alexandre, poorly organized piping becomes immediately visible. Planning the line hideaways is an integral part of the final result.
Neglecting access to the filters
A head unit wedged into an impossible-to-reach location will become problematic during cleaning.
Choosing the BTU rating before studying the room
Sizing must be based on heat losses and gains, but also on the actual ability of air to circulate between the different zones.
Focusing solely on the advertised minimum temperature
The fact that a heat pump can operate down to -30 °C is important, but its available capacity at low temperatures must also be examined and compared with the building’s needs.
Why this Saint-Alexandre project reflects our approach at AirGreen
This installation presents a situation we encounter regularly: an excellent location from a thermal standpoint is not necessarily the easiest wall to work on.
In this case, the existing brickwork, ceiling height, room angle, and line set routing all influenced the installation.
The solution was to integrate the FUJITSU AIRSTAGE ORION XLTH+ properly without compromising its performance.
This is the same logic we apply during our installations in Montreal, Laval, Longueuil, on the North Shore, the South Shore, and in the municipalities of Montérégie.
We examine the building first, then the unit.
Because a high-end heat pump installed in the wrong location can deliver disappointing results, while properly sized, well-positioned, and methodically installed equipment becomes a true year-round comfort system.
At Saint-Alexandre, this FUJITSU ORION XLTH+ R32 installation is a good example: a compact wall-mounted unit integrated into an unconventional existing structure, a clean line set layout, preserved air distribution, and a technical platform capable of providing heating and cooling in Quebec’s demanding conditions.