Installation of a Fujitsu AIRSTAGE Altair 700 wall-mounted heat pump in Saint-Édouard: a compact HVAC installation using R-32 refrigerant

In Saint-Édouard, an installation designed around simplicity, outdoor clearance, and performance

For this installation in Saint-Édouard, our AirGreen team installed a Fujitsu AIRSTAGE Altair 700 wall-mounted heat pump, a ductless solution designed to provide cooling and heating through a compact system consisting of a wall-mounted indoor unit and an outdoor unit with an Inverter compressor.

In the photo of this installation, several details immediately catch the attention of our HVAC installers. The outdoor unit is positioned against a brick wall on a bracket that keeps it above ground level. This arrangement is not merely aesthetic. In Quebec's climate, we must consider snow accumulation, condensate drainage during defrosting, airflow around the heat pump, and future access to the equipment for maintenance.

The choice of a Fujitsu Altair 700 is also technically appealing. The Fujitsu documentation provided for this series confirms the use of R-32 refrigerant, Inverter technology, built-in Wi-Fi, piping lengths of up to 20 m (66 ft), and heating operation down to -15 °C.

A Fujitsu AIRSTAGE Altair 700 designed for single-zone residential applications

The Altair 700 series is part of Fujitsu's AIRSTAGE single-zone wall-mounted lineup. The technical documentation provided with the project lists two capacities:

• 09KMAS1, with a nominal cooling capacity of 9,000 BTU/h;
• 12KMAS1, with a nominal cooling capacity of 12,000 BTU/h.

The exact capacity of the photographed installation cannot be confirmed from the exterior image alone, since the complete nameplate is not visible. We therefore prefer not to arbitrarily assign a BTU rating to this installation.

This distinction is important. At AirGreen, sizing a wall-mounted heat pump is not determined solely by a home's square footage. We also examine insulation, window orientation, sun exposure, heat loss, room layout, ceiling height, and how air can circulate between spaces.

An oversized unit is not automatically preferable. It can quickly reach the requested temperature without operating long enough to ensure optimal dehumidification in summer. Conversely, an undersized heat pump may operate at high load for long periods.

Performance varies depending on the capacity selected

The Fujitsu technical sheet provides several useful data points for understanding the differences between the two Altair 700 models.

For the 09KMAS1 model, the nominal cooling capacity is 9,000 BTU/h, with a modulation range from 3,100 to 12,100 BTU/h. In heating mode, the listed nominal capacity is 12,000 BTU/h, with a range from 2,800 to 14,500 BTU/h.

For the 12KMAS1 model, we find 12,000 BTU/h in cooling, with modulation reaching up to 13,800 BTU/h. Its nominal heating capacity is 14,000 BTU/h, with a listed maximum of 15,000 BTU/h.

This modulation capability is precisely one of the advantages of Inverter technology. Rather than operating solely according to an on-off logic, the compressor can adjust its output to the room’s actual needs. This helps stabilize the indoor temperature more effectively and reduce unnecessary cycles.

High energy efficiency for a small wall-mounted heat pump

The Altair 700 series offers particularly attractive efficiency levels for homeowners looking for a compact solution.

Fujitsu documentation indicates a 30.0 TRÉS2 for the 09KMAS1 model and 27.5 for the 12KMAS1 model. Both configurations are also identified as meeting the ENERGY STAR ratings presented in the Fujitsu technical sheet.

The manufacturer also indicates that its H-series AIRSTAGE systems can provide energy savings of up to 30%, depending on the conditions of use and the system being replaced.

In practice, however, actual performance depends on many factors: outdoor temperature, indoor setpoint, building insulation, occupants’ habits, and installation quality.

For us, this is an essential point. An excellent heat pump that is poorly installed can deliver disappointing results. Conversely, a carefully planned installation makes it possible to get more of the performance expected by the manufacturer.

R-32: a clearly visible feature on the outdoor unit in Saint-Édouard

In the photo of this installation, the marking R32 appears clearly on the outdoor unit’s panel.

Fujitsu explains that this refrigerant has a lower global warming potential than R-410A. In its documentation, the manufacturer compares a GWP of 675 for R-32 with 2,088 for R-410A, representing an announced reduction of 68%.

The use of R-32 is therefore part of the transition currently underway in the HVAC industry toward refrigerants with a lower climate impact.

For the homeowner, this does not change the heat pump’s day-to-day operation. For the installer, however, the refrigerant used affects installation procedures, handling practices, and the technical requirements applicable to the system.

1/4 in. – 3/8 in. piping that facilitates certain replacements

Another interesting detail about the Fujitsu Altair 700 concerns its refrigerant connections.

The technical data sheet indicates the following for models 09KMAS1 and 12KMAS1:

Liquid: 1/4 in.
Gas: 3/8 in.

This information can become particularly important when replacing an older wall-mounted heat pump.

In some projects we carry out in Montréal, Laval, Longueuil, the North Shore, the South Shore, and Montérégie, the client wants to know whether existing piping concealed in the walls can be reused. The answer depends on the line diameters, their condition, their length, the previous refrigerant, and the manufacturer’s guidelines.

Even when a diameter appears compatible, we must check the condition of the lines before deciding to reuse them.

Up to 66 feet of piping: useful flexibility on the job site

The manufacturer’s documentation allows a maximum piping length of 20 m, or 66 ft, with a maximum vertical difference of 14.9 m, or 49 ft. The stated minimum length is 3 m or 10 ft.

This flexibility makes it easier to choose the outdoor location.

We are therefore not required to install the compressor directly behind the indoor unit. In some buildings, it may be preferable to move the outdoor unit to an area that is less exposed to foot traffic, more accessible for servicing, or offers better airflow.

In Saint-Édouard, the photo shows a particularly compact outdoor installation against the brick façade, with an arrangement that minimizes the footprint.

Why raise the outdoor unit in Quebec?

One of the most important details visible in this installation is the height of the outdoor unit.

A heat pump used for heating regularly produces water during its defrost cycles. When temperatures are low, this water can freeze around the unit.

We therefore avoid placing a unit intended for winter heating directly at ground level without considering:

• the average snow level;
• water drainage;
• the space required beneath the unit;
• obstacles that could block the heat exchanger;
• accessibility for cleaning and servicing.

The support visible in this installation keeps the heat pump at a more appropriate height above the ground.

The brick wall requires careful installation

Securing or positioning an outdoor unit near a brick wall also requires particular attention.

It is not enough to drill through the facade and pass the lines through. We must consider the routing of the refrigerant lines, communication wiring, electrical supply, and condensate drain.

When we pass through an exterior envelope, the passage must also be properly sealed to reduce the risk of water or air infiltration.

This part of the installation is sometimes much less visible than a beautiful wall-mounted indoor unit, but it can have a direct influence on the project’s durability.

What this Fujitsu Altair 700 installation teaches us before choosing a heat pump

Heating operation down to -15 °C must be properly understood

The Altair 700 documentation indicates a heating operating range from -15 °C to 24 °C.

This information must be correctly interpreted by a Quebec homeowner.

A heat pump capable of operating at -15 °C is not necessarily intended to replace, on its own, all other heating sources in a home when the temperature falls well below that threshold.

In Saint-Édouard, as elsewhere in the Montréal and Montérégie regions, we can experience much colder periods.

When evaluating this type of project, we must therefore consider the existing heating system and determine how the heat pump fits into the building’s overall heating strategy.

For some homeowners, its primary purpose is air conditioning and providing much of the heating during moderate temperatures. For other projects requiring greater performance at very low temperatures, a series specifically designed for cold climates may be more appropriate.

An indoor sound level as low as 19 dB(A)

The Altair 700 is also well suited to bedrooms, offices, and living spaces where noise can become an important consideration.

Fujitsu indicates an indoor sound level as low as 19 dB(A) in quiet mode.

For the 9,000 BTU model, the indicated outdoor sound level is 44 dB(A) in cooling and 47 dB(A) in heating. For the 12,000 BTU model, it is listed at 48 dB(A) in cooling and 50 dB(A) in heating.

These values explain why the compressor’s location must still be chosen intelligently. Even relatively unobtrusive equipment should, when the building configuration allows, be placed away from a bedroom window or an area where sound could be amplified by adjacent surfaces.

A relatively light power supply: 15 A circuit breaker

Both capacities listed in the technical specifications operate on a 208 to 230 V, 60 Hz, single-phase power supply, with a specified 15 A circuit breaker.

This can be an advantage in certain renovation projects where space available in the electrical panel is limited.

Nevertheless, we always check the existing panel before installation. The presence of an empty slot does not automatically mean that the connection complies with requirements. The panel capacity, wire gauge, circuit protection, and manufacturer’s recommendations must all be considered together.

A compact heat pump, but with a heating capacity higher than its nominal cooling capacity

One of the interesting technical features of this range is its heating capacity.

Fujitsu indicates that the outdoor unit can provide up to 33% more heat than the labeled nominal capacity, depending on the model and conditions. The brochure also highlights the Inverter compressor and the compact outdoor unit format.

We can see this directly in the data:

• 9,000 BTU model in cooling: up to 14,500 BTU/h in heating;
• 12,000 BTU model in cooling: up to 15,000 BTU/h in heating.

However, the maximum capacity advertised under certain conditions should not be confused with the capacity available at all outdoor temperatures.

Built-in Wi-Fi: useful for managing the temperature remotely

The Altair 700 series also features Wi-Fi connectivity, enabling remote monitoring and control through the compatible AIRSTAGE ecosystem.

For some AirGreen customers, this detail matters almost as much as energy performance.

For example, it becomes possible to adjust the temperature before returning home or check the settings without being directly in front of the wall-mounted unit.

The series also supports various control and integration options, including wired controllers and interfaces compatible with certain building management systems.

ProCore Copper Coils: An Often-Overlooked Detail

Fujitsu documentation also mentions the use of highly corrosion-resistant ProCore copper coils in the indoor unit.

This type of detail is particularly important to homeowners comparing several brands beyond the initial price.

When a heat pump is installed to operate for many years, we recommend looking not only at seasonal performance, but also at the internal construction, service options, parts availability, and the overall quality of the distribution network.

Rebates: Always Confirm with the Exact Model Number

The Fujitsu documentation identifies both Altair 700 models with several ENERGY STAR classifications, including an indication associated with cold climates.

However, this does not mean that we should automatically announce a specific rebate amount for every installation.

In Quebec, programs may change, and the amounts often depend on the exact AHRI number, capacity, indoor model, outdoor model, and the rules in effect when the application is submitted.

At AirGreen, we therefore prefer to verify the exact configuration before presenting a rebate as guaranteed.

Mistakes We Recommend Avoiding with a Wall-Mounted Heat Pump

An installation like the one in Saint-Édouard highlights several mistakes we regularly encounter during replacements or inspections.

The first is choosing capacity solely based on a chart such as “so many square feet = so many BTUs.” These charts can provide a starting point, but they do not replace an analysis of the building.

The second mistake is choosing the outdoor location based solely on appearance. A discreet corner may seem ideal until we realize that it traps the air expelled by the fan.

The third is underestimating winter drainage. A heat pump produces water during defrosting, and this water must be able to drain away without creating a significant buildup of ice.

Finally, we advise against judging an installation solely by the equipment brand. The quality of the refrigerant connections, evacuation, support, wiring, drainage, and commissioning directly affects the result.

An AirGreen installation recognizable down to the smallest details

In the photo taken in Saint-Édouard, the AirGreen label installed directly on the unit also highlights a practical aspect of how we work: the homeowner can quickly identify the company that completed the installation and find our contact information when maintenance or service becomes necessary.

The unit also visibly displays its Fujitsu AIRSTAGE branding, its R-32 identification, and a certification label on the lower section.

We aim to leave behind a clean, understandable, and accessible installation rather than an appliance installed without regard for future servicing.

Saint-Édouard, Montreal, Laval, Longueuil, the North Shore, and the South Shore: the same working principle

Whether we install a Fujitsu wall-mounted heat pump in Saint-Édouard, a multi-zone system in Montreal, a central heat pump in Laval, or a ductless unit in Longueuil, the method remains essentially the same: understand the building before choosing the equipment.

The model must meet the property’s needs, but the location must also be realistic. The electrical supply must be suitable. The piping must comply with the permitted diameters and lengths. The outdoor unit must be prepared for Quebec conditions. Finally, the homeowner must understand the operating range of the equipment.

This Fujitsu AIRSTAGE Altair 700 installation in Saint-Édouard illustrates this approach well. It is a compact R-32 system using 1/4 in. and 3/8 in. piping, operating at 208–230 V with 15 A protection, offering Wi-Fi connectivity, and capable of operating in heating mode down to -15 °C.

For a homeowner looking for a relatively compact, quiet, high-efficiency Fujitsu wall-mounted heat pump for a single-zone application, the Altair 700 series therefore deserves to be evaluated in the actual context of the building rather than based solely on a BTU rating.

At AirGreen, that is precisely what matters to us in a successful HVAC installation: matching the equipment, the environment, the technical constraints, and the homeowner’s expectations in a cohesive, clean, and durable system.