Installation of a Fujitsu AIRSTAGE Orion XLTH wall-mounted heat pump in Sainte-Catherine, on Montreal’s South Shore
Installation of a Fujitsu AIRSTAGE Orion XLTH in Sainte-Catherine: R-32 wall-mounted heat pump for cold climates, meticulous installation, and AirGreen’s technical advice for efficient comfort on the South Shore.
Take a tour of the installation
Each number is a point we check on site. Switch between summer and winter to watch air and heat move.
In summer, the outdoor unit rejects the house's heat outside.
Generic illustration of this type of installation, not a survey of this job site. Tap a number.
Mounted level on a wall plate, high enough for the air to reach the whole room, with enough space around it to slide the filters out easily.
The refrigerant lines, the communication cable and the drain go through the wall in a single opening, sealed against water, cold air and insects.
Two insulated copper pipes connect the two units. Outside, a line cover can protect them from sun, knocks and weather.
A shut-off switch near the outdoor unit isolates it safely for service. It must stay accessible at all times.
The compressor and the fan. In heating mode it captures heat from the outdoor air, even in winter, and moves it inside.
On the ground or on the wall, it keeps the unit above accumulated snow. The unit stays clear and defrost water can drain away.
The fan needs to blow freely. Storage, a fence or a wall too close, and efficiency drops while noise goes up.
In Sainte-Catherine, a Fujitsu Orion XLTH installation designed to deliver comfort without taking up space in the room
A wall-mounted heat pump can be extremely high-performing on paper and still deliver disappointing results if its placement, clearance, or orientation is poorly chosen. For this installation carried out in Sainte-Catherine, we worked with a Fujitsu AIRSTAGE Orion XLTH, a product line specifically designed to provide heating and cooling in Quebec’s demanding conditions.
The installation photo immediately shows something we at AirGreen consider very important: the clean integration of the indoor unit into the room. The Fujitsu module is installed high on the wall, with clear space in front of the air outlet and positioned so that the heat pump can project air into the room rather than directly against an obstacle.
The visual result is understated. The white Fujitsu front panel blends into the light-colored wall, while the controls and indicators are discreetly grouped on the lower-right section of the unit. In the photo, the air discharge louver is open and the unit is running, which also makes it possible to see the angle at which the air is distributed.
This type of detail matters more than it may seem. For us, an HVAC installation in Sainte-Catherine is not simply a matter of mounting a unit on the wall: we must consider airflow, occupied zones, the required clearance around the unit, future access for HVAC maintenance, and the technical route between the indoor and outdoor units.
Why the Fujitsu Orion XLTH is particularly well suited to Quebec’s climate
The Fujitsu technical documentation provided for the AIRSTAGE Orion XLTH series indicates an operating range in heating mode down to -26 °C for the 09KZAH1, 12KZAH1, 15KZAH1, 18KZAH1, and 24KZAH1 variants. This is therefore not simply a wall-mounted air conditioner with a heating function added: this series was developed as a true cold-climate heat pump.
The series also uses R-32 refrigerant. In its documentation, Fujitsu indicates a global warming potential of 675 for R-32, compared with 2,088 for R-410A, representing a stated 68% reduction in GWP. The range is also equipped with an Inverter compressor, allowing the system to modulate its output instead of operating solely in on-off cycles.
For a homeowner in Sainte-Catherine, Longueuil, or elsewhere on the South Shore, this modulation is particularly useful during periods when heating or cooling demand is moderate. A properly sized heat pump can gradually adjust its operation to maintain a more stable temperature.
A compact indoor unit that conceals a great deal of technology
The design visible in the photo belongs to the wall-mounted Fujitsu AIRSTAGE family. Behind this relatively minimalist facade, the Orion XLTH documentation presents several useful features for a residential installation:
- Built-in Wi-Fi with control compatible with the AIRSTAGE app;
- Inverter technology;
- multiple fan speeds, including a quiet mode;
- backlit remote control;
- economy mode and energy-saving mode;
- minimum heat function;
- automatic defrost;
- automatic restart;
- ability to integrate with various controllers and management systems;
- Fujitsu ProCore indoor coil, made of highly corrosion-resistant copper;
- basic crankcase heater on the outdoor unit for cold-weather conditions.
The indoor unit’s sound level also deserves close attention. Depending on the capacity selected, the level in quiet mode drops to 23 dB(A) for the 9,000 and 12,000 BTU models, 26 dB(A) for the 15,000 BTU model, and 30 dB(A) for the 18,000 and 24,000 BTU versions.
This is a parameter we consider particularly important when the unit is located in a bedroom, living room, or living area used for extended periods.
What Fujitsu Orion XLTH capacity was installed?
The photo clearly identifies the Fujitsu AIRSTAGE family, and the project information indicates that it is an Orion XLTH. However, the nameplate containing the complete model number is not visible in this image. We therefore prefer not to arbitrarily assign a capacity of 9,000, 12,000, 15,000, 18,000, or 24,000 BTU to this installation.
This is an important distinction because the specifications genuinely change from one capacity to another.
The Fujitsu technical sheet on page 4 provides the following data, among other details:
| Series model | Rated cooling | Rated heating | VERY2 / SEER2 | CPSC2 Region V / HSPF2 |
|---|---|---|---|---|
| 09KZAH1 | 9,000 BTU/h | 12,000 BTU/h | 33,1 | 10,7 |
| 12KZAH1 | 12,000 BTU/h | 16,000 BTU/h | 30,5 | 10,1 |
| 15KZAH1 | 14,500 BTU/h | 18,000 BTU/h | 27,5 | 10,1 |
| 18KZAH1 | 18,000 BTU/h | 21,600 BTU/h | 25,5 | 10,1 |
| 24KZAH1 | 22,000 BTU/h | 25,200 BTU/h | 24,0 | 9,4 |
This range clearly illustrates why we avoid choosing a heat pump solely based on square footage. Proper sizing also depends on insulation, windows, sun exposure, room layout, number of floors, and the building’s heat loss.
Installing a larger unit “just to be safe” is not automatically an improvement.
An often-overlooked technical detail: piping varies according to capacity
For technicians and homeowners replacing an older heat pump, refrigerant line sizing is particularly important information.
The Orion XLTH series does not use the same piping for all capacities:
- 09KZAH1: liquid 1/4 po, gas 3/8 po;
- 12KZAH1: liquid 1/4 po, gas 3/8 po;
- 15KZAH1: liquid 1/4 po, gas 1/2 po;
- 18KZAH1: liquid 3/8 po, gas 5/8 po;
- 24KZAH1: liquid 3/8 po, gas 5/8 po.
That is why, when replacing a wall-mounted heat pump in Montreal, Laval, Longueuil, the North Shore, or the South Shore, we never automatically assume that the existing refrigerant lines can be reused.
Diameter compatibility, the condition of the copper, the refrigerant previously used, line length, and the manufacturer’s requirements must be verified before making this decision.
The same difference applies on the electrical side
Fujitsu documentation specifies a 208 to 230 V, 60 Hz, single-phase power supply for the entire series, but the circuit breaker rating varies.
The 09KZAH1 and 12KZAH1 models are specified with a 15 A circuit breaker, while the 15KZAH1, 18KZAH1, and 24KZAH1 variants are specified with a 20 A circuit breaker.
This point must be verified before installation. A capacity change can therefore affect not only the piping but also the required electrical supply.
The visible positioning in Sainte-Catherine: simple in appearance, important for performance
In this installation, the indoor unit is positioned very high on the wall while maintaining clearance from the ceiling. Air is discharged forward and downward, which follows the design logic of a wall-mounted unit intended to distribute air throughout the occupied space.
We consider several factors before determining the final location:
Airflow path
A unit should not direct most of its airflow straight into an upper cabinet, partition, or other obstruction. The goal is to achieve effective air circulation throughout the served area.
Occupant comfort
A technically possible location is not always a comfortable one. A direct and permanent projection toward a sofa, desk, or bed can become unpleasant, particularly in cooling mode.
Service access
The filters must be removable and cleanable. Over time, a deep cleaning of a wall-mounted heat pump may also become necessary. An installation placed extremely close to the ceiling or an architectural feature unnecessarily complicates the work.
Aesthetics
In this photo from Sainte-Catherine, the unit is neatly aligned, and the white casing remains relatively discreet on the wall. For AirGreen, the visual quality of the work is part of the installation, particularly when an HVAC system becomes a permanently visible element in a room.
What this Fujitsu installation in Sainte-Catherine can teach a homeowner before buying a heat pump
Do not choose only a brand: choose the right combination of capacity and installation
Two homes equipped with exactly the same Fujitsu Orion XLTH can deliver very different results if one is properly sized and installed and the other is not.
At AirGreen, we view the equipment as part of a complete system: the indoor location, outdoor unit position, refrigerant line length, condensate drainage, electrical supply, and building requirements must all work together.
Within the Orion XLTH series itself, the maximum piping length varies considerably by capacity. Fujitsu specifies up to 25 m for the 09 and 12 models, 30 m for the 15, and up to 50 m for the 18 and 24 models. The maximum allowable elevation differences also range from 20 m to 30 m, depending on the model.
In a more complex home, a condo, or a building where the outdoor unit must be located far from the indoor unit, this data can directly influence equipment selection.
Very-low-temperature performance deserves consideration before purchase
The statement “operates down to -26 °C” is useful, but it does not tell the whole story. An even more relevant figure is the actual heating capacity available as the outdoor temperature drops.
The Fujitsu data sheet specifically provides maximum capacity percentages at -15 °C, -21 °C, and -26 °C for each version in the series. At -26 °C, for example, the listed values range from 80% to 127% of the reference rated capacity, depending on the model.
This shows why we examine performance tables rather than just the minimum temperature stated in promotional materials.
For a residence in Sainte-Catherine, this information can make a difference during periods of extreme cold, when the heat pump is called upon to provide a significant portion of the heating.
What about LogisVert grants in 2026?
Fujitsu documentation classifies the Orion XLTH models presented as ENERGY STAR, including the cold-climate classifications.
For installations completed on or after November 26, 2025, Hydro-Québec indicates that a heat pump must, among other requirements, be certified ENERGY STAR to qualify for the LogisVert program. Hydro-Québec currently specifies that, when all program requirements are met, the standard grant for a heat pump certified for cold climates is calculated at $120 per 1,000 BTU/h of capacity at -8 °C.
However, the amount should not be calculated simply from the “12,000 BTU” or “18,000 BTU” in the commercial name. Hydro-Québec uses the eligible capacity specific to the installed combination and allows you to verify a heat pump using its AHRI number or ENERGY STAR model number. The program also specifies that the applicable amount depends on the installation date.
For certain multi-unit residential buildings meeting the program’s specific criteria, a bonus introduced for installations completed on or after June 15, 2026, may increase the assistance to $220 per 1,000 BTU/h at -8 °C. However, this bonus is subject to several conditions and should not be assumed for a residence simply because it is located in Sainte-Catherine.
At AirGreen, we therefore recommend confirming the exact combination being installed rather than promising an approximate amount based solely on the advertised nominal capacity.
A common mistake: comparing only the price of two heat pumps
When a homeowner compares multiple quotes for wall-mounted heat pumps on the South Shore, the total price is obviously important, but it is essential to verify what is actually being offered.
In particular, we recommend comparing:
- the precise capacity and indoor and outdoor model numbers;
- heating performance in cold weather;
- SEER2 and HSPF2/CPSC2;
- the type of refrigerant;
- the diameter of the refrigerant lines;
- the length of piping included in the installation;
- the planned electrical work;
- condensate drainage;
- the outdoor unit support;
- the warranties on parts, the compressor, and labor;
- actual eligibility for rebate programs;
- the proposed installation and commissioning method.
A lower-priced quote that omits several necessary tasks may ultimately become more expensive. Conversely, paying more is not an automatic guarantee of a better installation. The technical details and execution are what make it possible to compare quotes properly.
Why the Orion XLTH is an appealing option for Montreal and the surrounding regions
This Fujitsu Orion XLTH installation in Sainte-Catherine is a good example of the type of project we regularly complete: a relatively discreet wall-mounted indoor unit paired with a platform designed to operate for both heating and cooling.
The features that particularly stand out to us are operation down to -26 °C, R-32, the Inverter compressor, ENERGY STAR certification, built-in Wi-Fi connectivity, the range of capacities, and the detailed performance charts provided by Fujitsu.
But even a highly efficient machine requires an installation adapted to the building.
That is precisely the difference between simply buying a heat pump and undertaking a genuine HVAC project.
AirGreen: Fujitsu heat pump installation in Sainte-Catherine and Greater Montreal
At AirGreen, we install Fujitsu wall-mounted heat pumps in Sainte-Catherine, as well as in Montreal, Laval, Longueuil, the South Shore, and the North Shore.
Our approach is to assess the entire project before confirming the equipment: heating load, home configuration, unit locations, electrical requirements, piping, drainage, and the intended use of the system.
The photo of this installation in Sainte-Catherine shows the interior result we strive for: a cleanly installed, accessible unit that blends into the room without unnecessarily drawing attention.
In the case of the Fujitsu AIRSTAGE Orion XLTH, the technology is already highly advanced. Our job is to ensure that the installation truly allows this technology to deliver the comfort and efficiency it was designed to provide.
The big day, step by step
The main steps of this kind of job at AirGreen. Every house has its quirks: the estimate brings them out.
We look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
Model, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
Floors and furniture protected, wall plate position marked level, wall opening located.
A single opening, with the slope the drain needs to flow outside.
Set on a stand raised above the snow, with the clearances the manufacturer requires.
Connected, insulated and protected. The opening is then sealed against water, cold air and insects.
A dedicated circuit and an accessible disconnect near the outdoor unit.
Leak test, vacuum, then start-up and a check of heating and cooling.
Remote, modes, filters: we show you the essentials before we leave.
- The on-site estimateWe look at the room, the outside wall, the line route and where the outdoor unit will go. That is where the capacity gets chosen.
- The quoteModel, capacity and price, in writing. We also check whether the model qualifies for assistance programs.
- Getting readyFloors and furniture protected, wall plate position marked level, wall opening located.
- The wall openingA single opening, with the slope the drain needs to flow outside.
- The outdoor unitSet on a stand raised above the snow, with the clearances the manufacturer requires.
- Lines, cable and drainConnected, insulated and protected. The opening is then sealed against water, cold air and insects.
- The electrical workA dedicated circuit and an accessible disconnect near the outdoor unit.
- Tests and start-upLeak test, vacuum, then start-up and a check of heating and cooling.
- The walkthroughRemote, modes, filters: we show you the essentials before we leave.
What would it look like at your place?
Two quick checks with real numbers: what heat costs, and what your current heaters add up to in BTU/h.
Conversion: 1 W = 3.412 BTU/h. An indication, not a load calculation: baseboards and furnaces are often stronger than the real need, and they can stay as backup. AirGreen confirms the capacity on site.
Four mistakes we do not make
Flip each card to see what we do instead.
Your own project, step by step
What to do, season by season
Three habits per season for this unit. They take a few minutes and prevent many calls.
- Clean the indoor unit's filters.
- Clear leaves and debris left on the outdoor unit by winter.
- Test cooling before the first hot days.
- Clean the filters more often when the unit runs a lot.
- Keep plants away from the outdoor unit.
- Check that no water drips from the indoor unit.
- Rake the leaves around the outdoor unit.
- Test heating before the first cold days.
- Book periodic maintenance before winter.
- Keep snow away from the stand and the front of the unit.
- Let the unit defrost: it is normal.
- Never hit the ice on the fins; call us if the unit stays iced up.
Is your home ready?
Check what applies at your place. A "no" is not a refusal: it is what we sort out during the estimate.
Four statements: true or false?
It all comes down to details you have just seen.
1. In heating mode, the outdoor unit can produce water.
During defrost cycles. That water must drain away without forming ice.
2. You pick the capacity with a simple square-footage rule.
Windows, insulation, orientation and how the room is used all count. Capacity is chosen on site.
3. A multi-zone connects several indoor heads to a single condenser.
One head per room, all on the same condenser. Each room keeps its own temperature.
4. The disconnect can sit behind the patio furniture.
It must stay accessible: it is what shuts the unit off for service.
0 / 4 right answers
What people ask us about this kind of work
Does a wall-mounted heat pump heat in winter?
Wall-mounted or multi-zone: how do I choose?
Where does the outdoor unit go?
Are there grants?
Do I need a permit?
How cold can it heat?
How much can I save?
How is the LogisVert assistance calculated?
Is it noisy?
The outdoor unit is covered in ice: is that normal?
Does AirGreen hold the required licences?
Is the estimate free?
No question matches. Write to us: we answer.
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Text and photo: a real AirGreen Climatisation & Chauffage job. The diagrams are generic illustrations of the type of installation, not a survey of this job site. Sources of the added figures: airgreen.ca product pages (NEEP / AHRI performance), Hydro-Québec (Heat pumps page, LogisVert, read on 13 October 2026), Régie de l’énergie (rate D as of 1 April 2026).