A wall-mounted installation designed to withstand Saint-Liboire winters without complicating the home's architecture
At Saint-Liboire, installing a wall-mounted heat pump involves more than simply mounting an indoor unit and connecting an outdoor condenser. Equipment selection, the height of the outdoor unit, routing the lines, protecting the connections, clearances around the unit, and heating capacity when temperatures drop sharply all contribute to the final result.
For this installation, we worked with a FUJITSU AIRSTAGE ORION XLTH+, a series specifically designed to provide heating in very cold weather. Fujitsu's technical documentation indicates a heating operating range down to -30 °C, with R-32 refrigerant, an Inverter compressor, and a base pan heater intended for harsh climates.
The project photo also illustrates several important details of our approach at AirGreen: the outdoor unit is installed on metal wall brackets, directly in front of a brick façade, rather than placed at ground level. This configuration frees up the space beneath the heat pump and helps keep the unit away from the direct accumulation of snow, ice, leaves, and water.
Why the FUJITSU ORION XLTH+ Is Well Suited to Montérégie's Climate
In Saint-Liboire, as elsewhere on the South Shore and in Montérégie, the needs of a heat pump change considerably between July and January. A unit may seem to perform well during a 30 °C summer day, but the true test for a heat pump intended for Quebec heating comes when the mercury drops well below zero.
The FUJITSU AIRSTAGE ORION XLTH+ series was developed specifically with this reality in mind.
According to the technical data sheet provided for models 09KTAP1, 12KTAP1, and 15KTAP1:
- the heating range extends down to -30 °C;
- the air conditioner can operate between -10 °C and 50 °C;
- the system uses R-32;
- the compressor uses Inverter technology;
- a basic base pan heater is integrated for extreme cold conditions;
- the maximum permitted piping length is 20 metres, or 66 feet;
- the maximum permitted vertical difference is 14.9 metres, or 49 feet;
- the refrigerant lines use 1/4 in. for liquid and 3/8 in. for gas for the three capacities presented in this series.
This last detail is particularly relevant when replacing a heat pump. Before deciding to keep existing piping, we must always check its diameter, condition, length, and compatibility with the new equipment. A refrigerant line is not interchangeable simply because it already connects two units.
An outdoor unit on wall brackets: a visible detail that matters greatly
In this FUJITSU heat pump installation in Saint-Liboire, the outdoor unit is firmly supported by two metal brackets secured to the masonry.
This arrangement offers several practical advantages.
First, it keeps the bottom of the unit well above ground level. In winter, this additional height makes it easier to manage snow around the unit. A heat pump must be able to draw in and discharge large quantities of air. Allowing a unit to become surrounded by a snowdrift can significantly affect its operation.
Second, the space beneath the machine facilitates the drainage of water produced during defrost cycles. When a heat pump heats a home in cold weather, frost can form on the outdoor heat exchanger. The system then periodically initiates a defrost cycle. The resulting water must be able to leave the area around the unit without creating a mass of ice that could eventually rise toward the chassis.
Third, this installation keeps the service connections on the right side of the unit accessible. This is important for future HVAC maintenance: diagnostics, electrical checks, and work on the refrigeration circuit must be possible without unnecessarily dismantling the installation.
A clean installation on a brick wall requires precise preparation.
Masonry imposes its own constraints.
We must select suitable anchor points, position the supports to distribute the weight of the unit properly, and ensure that the heat pump remains stable. An outdoor unit contains a fan and a compressor that operate for long periods; an inadequate mounting can promote the transmission of vibrations through the structure.
The photo also shows that the pipes and cables are routed along the building in a relatively direct path. For us, the quality of a wall-mounted heat pump installation is judged as much when the system is off as when it is running: the piping, wiring, supports, and connections must form an organized and accessible whole.
Ce que nous vérifions avant de percer ou de fixer quoi que ce soit
What we check before drilling or attaching anything
- An installation of this type requires checking, among other things:
- the desired position of the indoor unit;
- the wall structure;
- the possible route for the condensate drain;
- the distance between the indoor and outdoor units;
- the actual length of the refrigerant piping;
- the required clearances around the condenser;
- the presence of windows, dryer vents, meters, or other equipment;
- future access to the unit’s valves and electrical panel;
- the height required to better manage snow;
the electrical power supply required by the installed capacity.
Making these decisions before installation avoids many compromises later on.
Performance varies according to the selected capacity
The ORION XLTH+ lineup presented in the Fujitsu documentation includes several capacities. It is therefore important not to automatically attribute the figures for a 9,000 BTU unit to a 12,000 or 15,000 BTU unit.
The provided specifications list, among others, the 09KTAP1, 12KTAP1, and 15KTAP1 models, associated respectively with nominal cooling capacities of 9,000, 12,000, and 14,500 BTU/h.
- For the 15KTAP1 model, for example, the documentation indicates:
- nominal cooling capacity: 14,500 BTU/h;
- cooling range: 3,900 to 19,400 BTU/h;
- nominal heating capacity: 17,400 BTU/h;
- heating range: 4,500 to 28,000 BTU/h; 28,7;
- TRÉS2 specified: 10,7;
- CPSC2 region V:
- minimal indoor sound level: 26 dB(A) in quiet mode;
- power supply: 208 to 230 V, 60 Hz, single-phase;
specified breaker: 20 A.
The 9,000 and 12,000 BTU variants have their own characteristics. This is precisely why we size a wall-mounted heat pump according to the property, rather than simply according to the area listed in a sales brochure.
Low-temperature capacity deserves more attention than nominal capacity
One particularly interesting figure in the Fujitsu specifications is the percentage of heating capacity available at very low temperatures.
- 157 % For the 15KTAP1, the manufacturer indicates a maximum capacity corresponding to:
- 138 % of its nominal capacity at -15 °C;
- 116 % at -26 °C;
- 101 % at -30 °C.
For the other capacities in the series, the ratios also vary. This information helps explain why a heat pump should not be evaluated solely by looking at its nominal BTU rating.
For a homeowner in Saint-Liboire, Longueuil, Laval, the North Shore, the South Shore, or Montréal, performance when the outdoor temperature drops can matter much more than the maximum output available on a mild fall day.
The technical details that make the difference between an installed heat pump and a truly finished HVAC installation
R-32 and the new generation of Fujitsu heat pumps
A clearly visible detail on the outdoor unit of this installation is the identification R32, accompanied by the safety marking corresponding to the refrigerant group A2L.
Fujitsu states in its documentation that R-32 has a significantly lower global warming potential than R-410A. The data sheet lists a GWP of 675 for R-32 versus 2,088 for R-410A, representing an announced reduction of 68%.
For the installer, a new refrigerant also means that work methods, tools, handling, and commissioning procedures must be adapted to the equipment.
We therefore do not treat an R-32 installation exactly like an older installation simply because both units are wall-mounted heat pumps.
Inverter technology primarily improves comfort modulation
An Inverter heat pump can vary compressor operation according to the room’s actual demand.
Rather than operating solely according to an on-off logic, the system can modulate its output. As the indoor temperature approaches the setpoint, the unit can reduce its output to maintain a more stable environment.
In a properly sized home, this modulation can help:
- limit sudden temperature fluctuations;
- extend periods of low-speed operation;
- reduce repeated starts;
- improve acoustic comfort;
- match energy consumption to actual needs.
Proper sizing remains essential, however. A larger unit is not automatically better for a given room.
As low as 23 dB(A) indoors, depending on capacity
The ORION XLTH+ series also emphasizes quiet operation.
The 09KTAP1 and 12KTAP1 models are listed at just 23 dB(A) in Quiet mode, while the 15KTAP1 is listed at 26 dB(A). Sound levels naturally vary with fan speed and operating conditions.
This feature becomes particularly valuable when the indoor unit is installed near a living room, bedroom, home office, or any space where background noise needs to remain discreet.
Integrated Wi-Fi and compatible controls
The documentation for the AIRSTAGE ORION XLTH+ also indicates integrated Wi-Fi connectivity with access through the AIRSTAGE mobile app.
The platform also supports several control options, including wired controllers and various interfaces intended for more advanced integrations. Fujitsu specifically mentions compatibility with BACnet and Modbus solutions through appropriate accessories.
For a single-family home, daily use generally remains simple: temperature, operating mode, ventilation, and scheduling. However, the ability to integrate the unit into a more advanced control infrastructure may be relevant for certain commercial or multi-unit residential projects.
ENERGY STAR and financial assistance: verify the exact pairing before calculating a rebate
The technical data sheet classifies the three configurations presented in the ENERGY STAR, ENERGY STAR Cold Climate, and ENERGY STAR Most Efficient 2025 categories.
This is a relevant consideration when a homeowner wants to check the financial assistance programs available.
However, we avoid advertising a rebate based solely on the commercial name “ORION XLTH+”. Eligibility must be validated using the exact pairing of the indoor and outdoor units, the selected capacity, and the references required by the applicable program at the time of installation.
This is a common mistake to avoid: two units with similar series names may not necessarily qualify for the same amount.
Errors we want to avoid when installing a wall-mounted heat pump
A successful installation often depends on details that are not very visible in an advertisement.
Among the errors we systematically seek to avoid at AirGreen:
-
Choosing BTUs based solely on floor area.
Insulation, windows, sun exposure, room layout, and heat loss must also be considered. -
Installing the outdoor unit too close to the ground.
In Quebec, snow and ice can quickly become a problem. -
Blocking airflow.
A condenser needs to breathe. The clearances around the unit are functional, not merely aesthetic. -
Reusing an existing line without checking it.
The diameters, cleanliness, and condition of the copper must meet the requirements of the new system. -
Neglecting condensate drainage.
A beautiful indoor unit cannot compensate for a poorly designed drain. -
Making the service valves inaccessible.
The installation must also be designed with the coming years of maintenance in mind. -
Choosing an excessive capacity “to be certain.”
Oversizing can negatively affect modulation, comfort, and dehumidification.
What this Saint-Liboire installation clearly demonstrates
The photograph of our project nicely summarizes several principles we apply when installing Fujitsu heat pumps.
The outdoor unit is positioned neatly against a brick façade, elevated on its supports, with the connections grouped on the side intended for servicing. The condenser retains clear space in front of its fan, while the technical routing remains relatively compact against the building.
This type of finish is important to us. An HVAC installation must operate properly from commissioning, but it must also remain logical when a technician returns several years later to perform maintenance or troubleshooting.
In Saint-Liboire, as in our projects in Montreal, Laval, Longueuil, on the North Shore and the South Shore, we therefore pay as much attention to selecting the machine as we do to its actual location on the property.
Why we offer the FUJITSU ORION XLTH+ for heating and air conditioning projects in Quebec
The combination of several features makes this series particularly interesting for certain residential projects:
- heating advertised down to -30 °C;
- Inverter technology;
- use of R-32;
- base pan heater designed for cold weather;
- compact outdoor format;
- piping that can reach 66 feet, depending on design limits;
- ProCore indoor coils made of highly corrosion-resistant copper;
- indoor operation as low as 23 dB(A) at certain capacities;
- integrated Wi-Fi;
- ENERGY STAR ratings indicated in the documentation;
- heating and air conditioning combined in a ductless wall-mounted system.
However, the machine’s name alone never determines the quality of a project. The right model, the right capacity, and an installation that complies with the building must work together.
A high-performance heat pump starts with an installation suited to the property
This installation of a FUJITSU AIRSTAGE ORION XLTH+ in Saint-Liboire shows why we approach every project as a complete installation rather than simply delivering equipment.
The condenser’s position, the brick mounting, the clearance beneath the unit, the line-set routing, access to the connections, sizing, and commissioning will all influence the use of the heat pump for many years.
At AirGreen, we install wall-mounted heat pumps, HVAC heating and air conditioning systems throughout the Greater Montreal area, as well as in several municipalities on the South Shore and surrounding areas. For every project, our goal remains the same: to select equipment suited to the building and install it cleanly, accessibly, and in a way that is consistent with Quebec’s climate conditions.