In Marieville, a wall-mounted installation where the indoor unit’s positioning plays a central role in comfort
In Marieville, we installed a FUJITSU AIRSTAGE Orion XLTH wall-mounted heat pump+ in a residential space where aesthetics, air circulation, and proximity to openings had to be carefully considered.
The jobsite photo shows an indoor unit installed high on a main wall, directly above a set of mirrors. On the right, a wide opening leads to an adjacent room. This configuration makes the choice of location particularly interesting: the system had to heat and cool not only the room where it is installed but also promote good air distribution toward nearby areas.
At AirGreen, we place great importance on this aspect. A wall-mounted heat pump installation is not simply a matter of finding an empty space on a wall. We analyze the room’s volume, openings, windows, available height, traffic areas, and how air will be able to move throughout the home.
In this Marieville project, the indoor unit was installed high enough to ensure effective air distribution while maintaining appropriate clearance from the ceiling. Its location above the mirrors also avoids taking up wall space that could be used for furniture while keeping the unit accessible for HVAC maintenance.
Why the FUJITSU Orion XLTH+ Is Particularly Well Suited to Quebec’s Climate
The FUJITSU AIRSTAGE Orion XLTH+ belongs to a product line designed for cold climates. According to the technical documentation provided by Fujitsu, the series can operate in heating mode down to an outdoor temperature of -30 °C.
This is an essential consideration for homeowners in Marieville, as well as those in Montreal, Laval, Longueuil, the North Shore, and the South Shore, where a heat pump must be able to maintain its performance during long periods of cold weather.
The Orion XLTH+ series also uses R-32 refrigerant. Fujitsu documentation indicates a global warming potential of 675 for R-32, compared with 2,088 for R-410A, representing an announced reduction of 68%.
This range therefore combines several features that are highly sought after today in a high-efficiency wall-mounted heat pump:
- heating operation down to -30 °C;
- Inverter technology;
- R-32 refrigerant;
- quiet operation;
- built-in Wi-Fi;
- several capacities available;
- ENERGY STAR certification, depending on the model;
- excellent power modulation.
A range of capacities suited to several types of rooms
The FUJITSU Orion XLTH+ series includes the 09KTAP1, 12KTAP1, and 15KTAP1 models.
The installation photo in Marieville clearly identifies the unit as a FUJITSU AIRSTAGE, but it does not allow us to confirm with certainty the exact capacity installed. We therefore prefer not to arbitrarily assign a BTU rating to this installation.
The manufacturer’s technical data sheet indicates the following nominal capacities:
- 09KTAP1 : 9,000 BTU/h in cooling and 12,000 BTU/h in heating;
- 12KTAP1 : 12,000 BTU/h in cooling and 15,300 BTU/h in heating;
- 15KTAP1 : 14,500 BTU/h in cooling and 17,400 BTU/h in heating.
These figures illustrate an important point: a heat pump’s heating capacity is not necessarily identical to its nominal cooling capacity.
When choosing a unit, we therefore never rely solely on the number of BTUs included in the system’s commercial name. We consider the home’s actual heating load and, above all, the capacity available when the outdoor temperature drops.
Excellent heating capacity at very low temperatures
Fujitsu’s technical data sheet presents particularly interesting information for cold-weather heating.
At -30 °C, the maximum heating capacity remains equivalent to:
- 113% of nominal capacity for the 09KTAP1;
- 103% for the 12KTAP1;
- 101% for the 15KTAP1.
At -26 °C, the indicated values are still 147%, 128%, and 116%, respectively.
For a homeowner comparing different heat pumps in Marieville, this data is more relevant than simple claims such as “operates down to -30 °C.”
Two units can advertise the same minimum operating temperature while offering very different heating capacities as they approach that limit.
That is why, when making our recommendations at AirGreen, we always analyze low-temperature performance when the system is expected to play an important role in heating the home.
Very high energy efficiency
FUJITSU documentation indicates a TRÈS2 of:
- 33.5 for the 09KTAP1 model;
- 31.5 for the 12KTAP1 model;
- 28.7 for the 15KTAP1 model.
All three versions are also listed as meeting the ENERGY STAR classifications mentioned in the manufacturer's documentation.
These high efficiency ratings can help reduce electricity consumption compared with certain conventional electric heating systems, especially when the heat pump operates for much of the winter within its optimal efficiency range.
However, this does not mean that you should systematically choose the model with the highest TRÈS2.
Sizing remains the priority.
A heat pump that is too large for the room may operate with less favorable cycles, while an undersized unit may lack capacity on the coldest days.
The positioning shown in the photo: a detail worth analyzing
In the photo of this installation in Marieville, we can see that the indoor unit is installed very close to the ceiling, but with sufficient space above the unit.
This height provides several advantages.
First, the cool air can be projected forward and mix with the ambient air before descending into the occupied area. In heating mode, the louvers can direct the warm air downward to reduce the natural stratification of heat near the ceiling.
Then, the wall beneath the unit remains practically entirely available.
Positioning the unit above mirrors is also interesting from an aesthetic perspective. Rather than installing the heat pump in the middle of a blank wall or compromising the placement of a piece of furniture, the unit fits into an area that is already being used vertically.
Finally, the opening to the right of the unit may help circulate air toward the adjacent room, depending on the residence's overall layout.
A common mistake: installing the unit in a corner that is too enclosed
We sometimes see systems installed very close to a side wall, in an alcove, or above a door where the airflow is immediately blocked.
This type of compromise can considerably reduce comfort quality.
In an installation like the one in Marieville, we want the fan to be able to send air into the room without immediately encountering:
- a partition;
- a wardrobe;
- a tall cabinet;
- a curtain;
- a wall return;
- a decorative obstruction.
Simply moving the unit a few dozen centimeters can sometimes have a much greater impact than choosing between two devices with nearly identical specifications.
A FUJITSU heat pump designed for everyday comfort, not just extreme days
Up to 23 dB(A) in quiet mode
Noise is a major consideration when the indoor unit is installed in a living space.
According to the FUJITSU specifications, the 09KTAP1 and 12KTAP1 models can reach as low as 23 dB(A) in quiet mode. The 15KTAP1 model goes down to 26 dB(A).
This noise level allows the heat pump to operate quietly, which can be especially appreciated in a living room, bedroom, office, or open space used daily.
The fan offers several speeds:
- automatic;
- high;
- medium-high;
- medium;
- medium-low;
- low;
- quiet mode.
This variety allows the system to adjust airflow more precisely according to demand.
Inverter technology: modulation rather than simple on-off operation
Inverter technology allows the compressor to adjust its output according to the temperature and the required load.
Instead of operating continuously at full capacity and then stopping completely, the unit can reduce its speed as the room approaches the desired temperature.
This modulation generally allows:
- more stable temperature;
- fewer abrupt cycles;
- quieter operation;
- better-adjusted energy consumption;
- better comfort during transitional seasons.
In a home in Marieville, this becomes particularly useful in spring and fall, when heating or cooling demand varies significantly throughout the day.
Built-in Wi-Fi for remote control
FUJITSU states that the Orion XLTH+ series has built-in Wi-Fi connectivity for remote monitoring with the AIRSTAGE app.
For many homeowners, this feature quickly becomes useful.
It allows you to change the temperature before arriving home, adjust operation from another room, or check the settings without having to use the infrared remote control.
The documentation also mentions more advanced control options with compatible interfaces, including BACnet and Modbus. These features will be particularly relevant in more complex projects or certain commercial environments.
ProCore copper coils
The indoor unit in the series uses ProCore coils, described by Fujitsu as copper coils with high corrosion resistance.
In an installation designed to operate for both heating and cooling, component durability is obviously an important consideration.
A wall-mounted system is used for several months each year. In some Quebec homes, it may even become the building’s most frequently used HVAC appliance.
Simple, identical piping dimensions across all three capacities
The technical documentation specifies identical refrigerant piping dimensions for all three models in this range:
- 1/4 in. for the liquid line;
- 3/8 in. for the gas line.
The specified minimum piping length is 10 ft, while the maximum length is 66 ft.
The maximum permitted vertical difference is 49 ft.
These features provide good flexibility for locating the outdoor unit when the building configuration does not allow it to be positioned directly behind the indoor unit.
Nevertheless, we always try to design a logical and as-clean-as-possible piping route.
An outdoor unit designed for our winter
Fujitsu indicates that the Orion XLTH+ includes a base pan heater designed for cold climates.
This feature deserves particular attention in Quebec.
During a defrost cycle, the heat pump melts the frost accumulated on the outdoor heat exchanger. This water must be able to drain properly.
When the outdoor temperature is very low, it can freeze quickly.
We must therefore consider not only the outdoor unit’s mechanical operation, but also:
- its height above the ground;
- snow that may accumulate around it;
- where the defrost water will fall;
- the possibility of ice formation;
- prevailing winds;
- accessibility for maintenance.
A unit capable of heating at -30 °C must be installed so that it can actually operate under these conditions.
The electrical circuit depends on the selected model
The series operates at 208 to 230 V, single-phase, 60 Hz.
According to the technical data sheet:
- The 09KTAP1 model requires a 15 A circuit breaker;
- The 12KTAP1 model requires a 20 A circuit breaker;
- The 15KTAP1 model also requires a 20 A circuit breaker.
Before any installation, we must therefore check the electrical panel’s capacity and the configuration of the available circuits.
This step is particularly important in older homes in Marieville, Montreal, Laval, Longueuil, the North Shore, and the South Shore, where electrical panels may already be heavily loaded.
A clean installation must also remain easy to maintain
The location shown in the photo keeps the indoor unit completely accessible.
This is important for heat pump maintenance, including filter cleaning and more thorough periodic cleanings.
A common mistake during renovation work is to install furniture, shelves, or decorative elements too close to the heat pump afterward.
We recommend always preserving sufficient clearance around the unit.
A high-performance unit will remain high-performing only if it can breathe properly and be maintained.
Why sizing must be based on the house rather than an online chart
It is tempting to choose the BTU rating according to a simple rule: a certain number of square feet would automatically correspond to a certain capacity.
In reality, several factors affect the requirements:
- insulation level;
- number of exterior walls;
- window size and orientation;
- sun exposure;
- ceiling height;
- number of floors;
- open or closed layout;
- air infiltration;
- desired indoor temperature;
- use of the heat pump as the primary or secondary heating system.
In Marieville, the large opening to the right of the unit is precisely an element that must be taken into account. A heat pump can contribute to the comfort of an adjacent room when air circulation is favorable, but it does not automatically replace a dedicated unit if the space is divided or far away.
What we aim to achieve at the end of a project
Once the heat pump is installed, our goal is for the homeowner to almost forget it is there.
The temperature must be stable, the air must be distributed properly, and the unit must not unnecessarily attract attention.
On this Marieville project, the unit’s elevated position and white color allow it to blend naturally into the light-colored wall. The mirrors below remain usable, and the opening on the right remains completely unobstructed.
The heat pump therefore becomes a functional part of the building without compromising the interior design.
A four-season solution for Marieville and Greater Montreal
The published operating range for the FUJITSU Orion XLTH+ extends from -10 °C to 50 °C in cooling and from -30 °C to 24 °C in heating.
It is therefore truly a system designed to be used for a large part of the year.
In summer, it provides air conditioning and contributes to dehumidification.
In spring and fall, Inverter technology enables fine modulation.
In winter, its low-temperature heating capacity allows it to continue operating when several heat pumps less suited to cold climates begin to lose a great deal of performance.
For homeowners in Marieville, as well as in Montreal, Laval, Longueuil, the North Shore, and the South Shore, this versatility is one of the main arguments in favor of a properly sized cold-climate heat pump.
A few tips before a similar installation
Before having a wall-mounted heat pump installed, we recommend considering a few simple elements.
First, observe the natural flow between rooms. A unit positioned facing an opening can sometimes serve a larger area than one enclosed in a corner.
Next, avoid choosing the location solely based on the home's exterior appearance. The indoor and outdoor units must be planned together.
Future furniture must also be taken into account. A wall that is completely clear today may hold a large bookcase or cabinet a few months later.
Finally, the electrical panel must be checked before finalizing the model selection.
These small decisions made before the work begins contribute enormously to the quality of the final HVAC installation.
The AirGreen approach to a wall-mounted heat pump installation in Marieville
On this project, as with our heat pump installations in Montreal, Laval, Longueuil, on the North Shore, and on the South Shore, we approached the heat pump as an integral part of the building.
We took into account the available space, ceiling height, openings, air movement, access for maintenance, and visual integration.
The FUJITSU AIRSTAGE Orion XLTH+ offers very strong technical features: heating down to -30 °C, R-32 refrigerant, Inverter technology, built-in Wi-Fi, very quiet indoor operation, and high energy performance.
But even the best appliance will not deliver the expected results if its location or sizing is poorly chosen.
That is why we consider every project a customized installation.
In Marieville, this FUJITSU heat pump fits neatly into a true living space and demonstrates that a successful installation must bring together three elements: an appliance suited to the Quebec climate, proper sizing, and thoughtful placement.