A discreet indoor installation designed to distribute air efficiently without compromising the room’s architecture
In Hinchinbrooke, this installation of a Fujitsu AIRSTAGE Altair 700 wall-mounted heat pump perfectly illustrates an aspect of HVAC work that may seem simple in a photo but requires considerable precision in the field: determining exactly where to place the indoor unit to achieve good air circulation, maintain the access needed for maintenance and integrate the equipment neatly into the room.
In the photo of our installation, the Fujitsu wall-mounted unit is very close to the ceiling, on a light-colored wall, near an architectural corner with several moldings. The available space was therefore precisely defined. We had to avoid placing the unit too close to the decorative elements, maintain the clearances required for operation and position the heat pump so that its flap could distribute air throughout the room without obstruction.
The result is intentionally understated: no exposed refrigerant lines around the unit, no visible wiring and a heat pump with a white casing that blends naturally into the existing decor.
This installation in Hinchinbrooke, in the Montérégie area, is also a good example of what we look for at AirGreen when a homeowner chooses a wall-mounted heat pump: a high-performance machine is not enough. Its location, piping route, leveling and the way it integrates with the building largely determine the quality of the final result.
Why the indoor unit’s position was particularly important here
The site photo immediately reveals several constraints.
The unit is installed very high, which is generally advantageous for a wall-mounted heat pump because the conditioned air can be projected more freely into the room. However, it is not enough to mount the unit “as high as possible.”
For this project, we had to take several factors into account, including:
- the ceiling;
- the decorative moldings;
- the angle of the wall to the right of the heat pump;
- the full opening of the lower flap;
- the air intake located in the upper part of the unit;
- the routing of the lines behind or near the unit;
- for future accessibility for HVAC cleaning and maintenance.
A wall-mounted unit placed too close to the ceiling could make filter maintenance less convenient or disrupt air intake. Conversely, an installation that is too low can become visually dominant and compromise air distribution.
Here, the positioning preserves a clean finish while keeping the unit in the upper part of the wall, where a Fujitsu heat pump can efficiently distribute heating or cooling.
A particularly clean integration in a room with trim
The visible trim around the ceiling also made the finishing more delicate.
In a room without architectural details, moving a unit a few centimetres to the left or right may have virtually no aesthetic impact. Here, that was not the case. The proximity of the corner and trim required a clean alignment.
We pay close attention to this kind of detail during our wall-mounted heat pump installations in Montreal, Laval, Longueuil, on the North Shore, the South Shore, and in Montérégie. A heat pump remains visible for many years. A positioning difference that seems minor during installation can become obvious every time the homeowner enters the room.
The photo of this Hinchinbrooke installation shows an appliance that appears to belong in the space rather than having been added without consideration.
Fujitsu Altair 700: how the technical specifications concretely affect a residential installation
The Fujitsu AIRSTAGE Altair 700 is a single-zone wall-mounted heat pump from Fujitsu’s H series. The technical documentation for this family covers two combinations: the 09KMAS1 and 12KMAS1 models. The indoor unit photo does not allow us to read the nameplate, so we therefore avoid arbitrarily assigning either capacity to the photographed system.
The Altair 700 family includes:
- a version with 9,000 BTU/h in cooling, with a nominal heating capacity of 12,000 BTU/h;
- a version with 12,000 BTU/h in cooling, with a nominal heating capacity of 14,000 BTU/h.
This distinction is important. We never choose a capacity solely because a “larger” heat pump seems to offer more heating.
9,000 or 12,000 BTUs: why proper sizing remains essential
For a residence in Hinchinbrooke, as for a property in Montreal, Laval, or Longueuil, several factors influence sizing:
- the actual area served;
- ceiling height;
- the number and type of windows;
- sun exposure;
- insulation;
- the layout of the rooms;
- the number of exterior walls;
- heat loss in winter;
- the way air can circulate from one room to another.
The 09KMAS1 version can modulate its cooling capacity between 3,100 and 12,100 BTU/h, while the 12KMAS1 can vary between 3,100 and 13,800 BTU/h. In heating mode, the advertised ranges are respectively 2,800 to 14,500 BTU/h and 2,800 to 15,000 BTU/h.
This modulation capability is one of the major advantages of Inverter technology.
Instead of constantly operating at full capacity and then shutting off, the system gradually adjusts its output according to demand. This helps maintain a more consistent temperature and can reduce repetitive on-off cycles.
Up to 30.0 SEER2 depending on capacity
Energy efficiency is one of this series' strengths.
According to the Fujitsu specification sheet:
- the 09KMAS1 model has a SEER2 of 30.0;
- the 12KMAS1 model has a SEER2 of 27.5.
The documentation also identifies both models as meeting the ENERGY STAR, ENERGY STAR Cold Climate, and the program listed by Fujitsu in its technical sheet.
For a homeowner comparing several wall-mounted heat pumps, these figures are interesting, but we always recommend looking beyond a single rating.
A highly efficient unit that is improperly sized or positioned may deliver poorer results than a system selected precisely for the building's needs.
Heating down to -15 °C according to the published operating range
Fujitsu specifies an operating range for the Altair 700 in heating mode down to -15 °C, and an operating range in cooling mode from -10 °C to 50 °C.
For an installation in Hinchinbrooke, this information deserves to be properly understood.
An operating limit of -15 °C means that the unit is designed to operate down to that temperature under the conditions published by the manufacturer. It does not mean that its heating capacity remains the same at all outdoor temperatures.
That is why we always consider the heat pump in the broader context of the property: insulation, existing heating system, the owner's needs, and intended use.
R-32: a technical component of this new generation from Fujitsu
The Altair 700 series 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.
For the homeowner, this change is not noticeable in the heat pump’s everyday use. For our technicians, however, it directly affects the work methods, tools, connection practices, and procedures that must be followed during the HVAC installation.
An R-32 heat pump must be installed with the refrigerant’s specific requirements and the manufacturer’s specifications in mind. It is not simply a matter of mechanically replacing an old R-410A system while keeping all the old practices.
1/4 in. and 3/8 in. lines
For both documented Altair 700 capacities, Fujitsu specifies:
- 1/4 in. for the liquid line;
- 3/8 in. for the gas line.
The specified minimum piping length is 10 feet, while the maximum length can reach 66 feet. The maximum permitted vertical difference is 49 feet.
These dimensions are not suggestions.
When we carry out a Fujitsu heat pump installation, the piping dimensions must be respected. Automatically reusing an old line simply because it is already in the wall can create a problem if its dimensions do not match those required by the new unit.
This is an error we specifically strive to avoid when replacing systems.
An invisible detail in the photo: the care taken with the line routing
One of the best visual aspects of this indoor installation is precisely what you do not see.
Around the Fujitsu heat pump:
- no long line-hide is visible;
- no wire hangs down from the side of the unit;
- no insulated copper tubing is exposed;
- no condensate drain runs through the wall in a disorganized manner.
This requires planning the route before permanently securing the wall plate.
Depending on the building configuration, the lines may exit directly behind the unit or be routed toward one side. In all cases, we must manage the refrigerant piping, wiring, and condensate drainage simultaneously.
Drainage is particularly important in cooling mode. Moisture extracted from the air condenses in the indoor unit and must be drained properly.
Insufficient slope, a crushed pipe, or a poorly designed route can potentially cause water leaks indoors, even when the heat pump itself is operating normally.
Only 19 dB(A) in quiet mode
In a residential room like the one pictured, the indoor unit’s sound level can be just as important as its energy efficiency.
The Altair 700 specifications indicate a sound level as low as 19 dB(A) in quiet mode. The published values for the indoor unit are identical for both capacities:
- quiet: 19 dB(A) in cooling mode;
- low speed: 30 dB(A);
- medium speed: 35 dB(A);
- high speed: 40 dB(A).
In heating mode, the stated values are slightly different depending on the speed, including 21 dB(A) in quiet mode.
This feature is particularly relevant when a wall-mounted heat pump is installed in a bedroom, office, living room, or space where occupants spend several consecutive hours.
The proximity of the ceiling also requires regular filter maintenance
The Altair 700 uses washable air filters. Fujitsu also specifies ProCore indoor coils made of highly corrosion-resistant copper.
Even with a high-performance heat pump, maintenance remains essential.
When the filters accumulate too much dust, airflow decreases. The fan then has to operate under less favorable conditions, and comfort can gradually deteriorate.
We therefore recommend that homeowners check the filters regularly, especially when there are:
- pets;
- a lot of dust;
- renovations;
- intensive use of the heat pump;
- multiple occupants in the house.
Periodic professional HVAC maintenance can then clean the evaporator, tangential fan, and components that the owner normally cannot access more thoroughly.
Integrated Wi-Fi for remote control
Fujitsu documentation also mentions integrated Wi-Fi connectivity with the AIRSTAGE mobile app.
This makes it possible to manage certain heat pump functions remotely, which is particularly convenient when a property is not occupied constantly.
The series also supports several control and integration options, including certain wired controllers and interfaces that enable compatibility with BACnet and Modbus protocols.
For a typical residence in Hinchinbrooke, Wi-Fi control is probably the most directly useful feature. More advanced integration options become particularly interesting in commercial buildings or automation projects.
A 208–230 V power supply with 15 A protection, as specified by Fujitsu
The two documented Altair 700 configurations operate at 208 to 230 V, 60 Hz, single-phase, and the technical sheet specifies a 15 A circuit breaker.
Nevertheless, always rely on the data for the specific installed model and the electrical requirements applicable to the project.
During our installations, the electrical work is never treated as a secondary detail. A new heat pump must be powered correctly, and the circuit protection must meet the equipment’s requirements.
Mistakes to avoid when installing a wall-mounted heat pump near the ceiling
An installation like the one in Hinchinbrooke highlights several mistakes we seek to prevent.
Installing the unit too close to trim
The casing must be able to open for maintenance, and the filters must remain accessible. The clearances required for air intake must also be maintained.
Neglecting the airflow direction
A unit that is visually well centered is not necessarily positioned properly for comfort. We also assess the direction in which the air needs to be projected.
Forgetting about drainage
An installation is not successful if the condensate water cannot drain properly.
Reusing any existing piping
For the Altair 700 shown here, Fujitsu specifies 1/4 in. liquid and 3/8 in. gas lines. Existing piping must be checked before deciding whether to reuse it.
Automatically choosing 12,000 BTU when 9,000 BTU would be sufficient
Oversizing is not an advantage. The right capacity is the one that matches the building’s actual load and the area being served.
An AirGreen installation where aesthetics and technical performance go hand in hand
This Fujitsu AIRSTAGE Altair 700 heat pump installation in Hinchinbrooke looks minimalist once completed. That is precisely the goal.
The homeowner essentially sees a white indoor unit, neatly aligned high on the wall. Behind this apparent simplicity, however, are several technical decisions: height, location, wall bracket, piping route, drainage, electrical supply, clearance around the unit, and airflow direction.
At AirGreen, we apply the same approach to our wall-mounted heat pump installations in Montreal, Laval, Longueuil, on the North Shore, the South Shore, and in surrounding municipalities.
We want the installation to be clean on the day we complete the work, but above all, to remain practical to use, accessible for maintenance, and suited to the building for years to come.
In this Hinchinbrooke project, the Fujitsu Altair 700 fits particularly well into the room thanks to its compact wall-mounted design and careful positioning around the existing architectural constraints. It is an installation where the most successful elements are precisely those that attract the least attention: no unsightly piping, no exposed cables, and a unit that blends naturally into the wall while remaining positioned to provide heating and cooling effectively.