An installation above a large window where every inch of wall space had to be used intelligently
In Le Sud-Ouest de Montréal, we installed a Fujitsu AIRSTAGE Orion XLTH wall-mounted heat pump in a residential unit located high above the ground, with a constraint that was particularly visible in the site photo: the available wall space was limited by a large window, a glass door leading to the balcony, and a narrow wall return on the right side.
Rather than sacrificing a significant portion of usable wall space or placing the unit in a location that would have distributed the air poorly, we chose to position the Fujitsu heat pump directly above the window.
This choice may seem simple when viewing the final result, but it requires several checks: clearance below the ceiling, strength of the mounting surface, access for maintenance, airflow direction, refrigerant piping route, condensate drainage, and the ability to maintain a clean visual finish.
The photo also shows the care taken with the piping route. To the right of the indoor unit, we used a white line-set cover that follows the wall vertically. This allows the mechanical connections to blend into the décor rather than leaving the piping and wiring exposed.
In a home where the heat pump is located directly in the living area, this kind of detail is important. The installation must be technically correct, but it must also fit naturally into the room once the ladder, tools, and construction materials have been removed.
A heat pump installed above a window: a location that requires precision
Placing a wall-mounted unit above a window is sometimes an excellent solution, but it is never a decision we make solely for aesthetic reasons.
We must first verify that the available space allows the required clearances around the wall-mounted heat pump.
In this Southwest installation, the Fujitsu unit is located near the ceiling, but its positioning still allows air intake through the upper section and air discharge through the lower louver.
The front panel also remains accessible.
This aspect is essential because, sooner or later, a technician must be able to:
- open the unit;
- remove the filters;
- clean the heat exchanger;
- access the condensate pan;
- inspect the blower wheel;
- check the electrical components;
- perform HVAC maintenance or diagnostics.
A very compact installation must never become an installation that is impossible to service.
Routing the lines along the right side: a visible detail that reveals part of the work
The photo clearly shows the line-hide descending along the right side of the Fujitsu unit.
Behind this finish are the components that allow the indoor and outdoor units to operate as a single system: refrigerant piping, communication wiring, and, depending on the chosen route, condensate drainage.
In an apartment or high-rise residential unit, routing these components can become more complex than in a detached house with a completely unobstructed exterior wall.
The balcony’s proximity is therefore advantageous.
It generally allows for a relatively direct route to the outside, subject to the building’s actual configuration and the rules applicable to the property.
Reducing unnecessary detours offers several advantages:
- a cleaner-looking installation;
- less line-hide length;
- fewer changes in direction;
- easier drainage planning;
- better future access to the connections.
A large glazed area that directly affects cooling requirements
The location shown in the photo includes a large window and a glass door opening onto the balcony.
This type of glazed façade can play an important role in calculating a room’s heat load.
In summer, sun exposure can quickly increase the indoor temperature. The amount of heat entering through the windows depends in particular on their orientation, size, thermal performance, and whether blinds or curtains are present.
This is one of the reasons why we avoid sizing a heat pump based solely on the number of square feet.
We also assess:
- the room’s exposure;
- the number of windows;
- the glazed area;
- the floor;
- insulation;
- the layout of the home;
- adjacent rooms;
- natural air circulation.
In a unit located several floors above ground level, the thermal experience can be very different from that of a ground-floor unit, even if both homes have exactly the same floor area.
Fujitsu AIRSTAGE Orion XLTH: a range designed for both winter and summer
The Fujitsu AIRSTAGE Orion XLTH series used for this type of installation is a single-zone cold-climate range.
According to the Fujitsu documentation provided for this project, the family includes several rated cooling capacities: 9,000, 12,000, 14,500, 18,000 and 22,000 BTU/h, depending on the combination of indoor and outdoor units. Rated heating capacities range from 12,000 to 25,200 BTU/h.
The photo does not make it possible to read the nameplate of the installed unit. We therefore do not artificially assign it a specific capacity.
This is important because several units in the same family may have a very similar exterior appearance while having different technical specifications.
Heating down to -26 °C for Montreal’s climate
The most important feature of this series for our climate is its heating operating range.
Fujitsu indicates that the Orion XLTH models presented in the technical specifications can operate in heating mode down to -26 °C. The documentation also specifies that there is no shutdown device at this temperature.
In Montreal’s Le Sud-Ouest, this means that this heat pump is not intended only for cool spring or fall days.
It was developed to continue producing heat during a much more demanding part of the Quebec winter.
The minimum operating temperature is only part of the equation, however.
What really matters: the capacity still available when it is very cold
The Fujitsu technical specifications go further by indicating the percentage of maximum capacity available at several winter temperatures.
Depending on the model, the data is provided at:
- -15 °C;
- -21 °C;
- -26 °C.
Some capacities in the series still deliver maximum output above their rated reference capacity even at very low temperatures.
This information is particularly useful when a homeowner compares several cold-climate heat pumps.
Two units may display the same operating limit at -25 °C or -26 °C and yet produce different amounts of heat when the thermometer actually reaches that temperature.
At AirGreen, we therefore look at the winter performance curve, not just the most impressive figure printed in a brochure.
This project in Southwestern Quebec shows why the choice of equipment and the quality of the installation must go hand in hand
Inverter technology for a more stable temperature
The Fujitsu Orion XLTH uses Inverter technology.
This technology allows the compressor to modulate its capacity rather than operate solely through simple on-and-off cycles.
In a residential space with large windows, this modulation is particularly valuable.
The thermal load can change throughout the day. A room heavily exposed to sunlight may require more cooling for a few hours, then much less once the sun has moved.
The inverter allows the system to gradually adapt to these changes.
The goal is therefore not only to reach the desired temperature, but to maintain it with fewer fluctuations.
Indoor operation that can become remarkably quiet
A heat pump installed in a living room or living area should be acoustically comfortable.
Depending on the model in the range, Fujitsu indicates an indoor sound level as low as 23 dB(A) in quiet mode. The series also offers several fan speeds, with six levels plus automatic mode.
This is an important consideration in an installation like this because the unit is placed directly in the occupied area.
The performance of an HVAC system is not measured solely in BTUs. Noise, airflow speed, and temperature stability have just as much influence on the everyday experience.
A wall-mounted unit that takes up no floor space
In an urban dwelling, preserving available space is often a priority.
The ductless heat pump is well suited to this constraint.
In this installation, using the area above the window preserves:
- floor space;
- the adjacent wall;
- access to the balcony;
- full use of the window;
- movement through the room.
The system remains visible, but its placement makes use of an area that would otherwise have been difficult to use.
Why a pipe cover is more important than it appears
A pipe cover is not simply a decorative element.
It also protects the various installation components and creates a more orderly route along the wall.
On this project, the white cover blends in with the interior finish and follows the wall return on the right side.
Poor planning could have created a succession of bends or a highly visible route across the room.
We prefer to plan the route before permanently securing the unit so that the mechanical line integrates as much as possible with the existing architecture.
R-32: the refrigerant used by the new Orion XLTH range
The documented series operates with R-32 refrigerant.
Fujitsu indicates a global warming potential of 675 for R-32, compared with 2,088 for R-410A in the comparison presented in its documentation, representing an approximately 68% reduction in GWP.
The refrigerant change also has a practical consequence for installations and replacements: we must always verify the exact requirements of the new unit.
An older heat pump installed in the same location does not necessarily mean that all existing components are compatible.
Pipe diameters are not identical for all capacities
The Fujitsu data sheet lists several pipe sizes depending on the selected Orion XLTH model.
The combinations shown include:
- 1/4 in. liquid and 3/8 in. gas;
- 1/4 in. liquid and 1/2 in. gas;
- 3/8 in. liquid and 5/8 in. gas.
This difference can become decisive when replacing an older heat pump in a condo or apartment.
Automatically reusing existing piping without measuring its diameter can result in an installation that does not comply with the new appliance’s specifications.
We therefore always check the indoor and outdoor models before confirming a solution.
Electrical requirements also vary depending on capacity
All appliances in the documented series operate at 208 to 230 V, 60 Hz, single-phase.
However, the specified circuit breaker varies between 15 A and 20 A depending on capacity.
This distinction is important in urban residential buildings, where the electrical panel may be compact and several circuits may already be in use.
During a project, we must confirm that the available power supply actually matches the requirements of the proposed equipment.
A high-mounted installation also requires proper drainage management
In cooling mode, the indoor unit removes some of the moisture present in the air.
The Fujitsu technical data sheet also indicates a moisture-removal capacity that varies by model within the series.
All this water must be drained properly.
The drain must therefore be planned with a sufficient slope when drainage relies on gravity.
For an installation above a window, the route must be planned before drilling and before permanently securing the line-set cover.
An improperly sloped drain can eventually cause:
- water accumulation;
- noise;
- overflow;
- condensation;
- infiltration on the interior wall.
Drainage quality is one of those details that customers hardly ever notice when everything works properly, but immediately notice when there is a problem.
Washable filters make routine maintenance easier
The Orion XLTH series uses washable filters.
For a homeowner, regularly cleaning the filters is one of the simplest ways to maintain good airflow.
Overloaded filters can reduce airflow, increase operating time, and diminish comfort.
Therefore, a high installation must not prevent this routine maintenance.
We always keep in mind the possibility of opening the front panel and accessing the filters.
Integrated Wi-Fi and remote control
Fujitsu’s documentation also presents integrated Wi-Fi connectivity with remote monitoring and control through the AIRSTAGE app.
In a Montréal home, this can be particularly practical during periods of extreme heat or cold.
The homeowner can adjust the system before returning home instead of unnecessarily running the heat pump at the full setpoint all day.
The series also offers several controller and additional interface options depending on the installation requirements.
ENERGY STAR and energy performance: always verify the exact combination
The technical sheet provided classifies the Orion XLTH systems presented in ENERGY STAR categories, including references associated with cold climates.
However, performance varies from one capacity to another.
The documentation indicates VERY2 values of up to 33.1 BTU/hW for certain models, with different values for higher capacities.
For this reason, we always recommend comparing specific model numbers rather than simply using the trade name “Orion XLTH.”
The same applies to rebate programs.
Eligibility must be confirmed based on the exact combination of units, applicable criteria, and program requirements at the time of the project.
A highly glazed façade makes supply-air positioning particularly important
In this installation in the Southwest, the unit is located above a heavily glazed area.
This position can be advantageous because a significant portion of heat gains and losses occurs precisely near windows.
In summer, the heat pump helps offset solar heat gain.
In winter, it can help reduce the sensation of coolness associated with a large glazed area.
However, the louvers must be oriented properly so that the air is distributed throughout the room rather than remaining concentrated immediately in front of the unit.
The vertical airflow direction is automated on the documented series, while horizontal adjustment is indicated as manual.
What we check before a similar installation in a condo or apartment
A project like this reminds us of several essential points to address before work begins:
- Confirm the available space above the window.
- Check the clearances required by the manufacturer.
- Confirm the wall structure and mounting points.
- Choose the capacity based on the home’s actual load.
- Determine the piping route before drilling.
- Properly plan the condensate drain.
- Check the electrical supply.
- Confirm the authorized location for the outdoor unit.
- Plan for future access for HVAC maintenance.
- Minimize the visual impact of the piping as much as possible.
These steps are particularly relevant in buildings in the Southwest, downtown Montreal, and high-density residential areas, where architectural layouts are rarely as simple as those of a house with four unobstructed exterior walls.
AirGreen: installations adapted to the actual architecture of Greater Montreal
This installation of a Fujitsu AIRSTAGE Orion XLTH heat pump in Le Sud-Ouest of Montreal clearly demonstrates how we work.
We made use of limited space above a large window, preserved access to the balcony and wall surfaces, and then integrated the mechanical route into a discreet pipe cover on the right side.
The result appears simple because the planning work was completed beforehand.
At AirGreen, we carry out wall-mounted heat pump, heating and air conditioning system, and HVAC projects throughout Montreal, Laval, Longueuil, the North Shore, and the South Shore.
However, every project presents its own constraints.
In Le Sud-Ouest, this may involve a large glass surface, a balcony, a unit located several floors up, a very short wall, or an interior layout with few possible installation locations.
Our role is to find a solution that respects the equipment, the building, and the space’s everyday use.
The Fujitsu Orion XLTH provides the technical features required for a demanding climate: heating operation down to -26 °C, Inverter technology, R-32 refrigerant, quiet indoor operation, and several available capacities.
However, a heat pump of this quality delivers its best performance only when it is properly sized and installed.
This is precisely the combination we focus our work on.