Installation of a Fujitsu AIRSTAGE Altair 500 wall-mounted heat pump in Saint-Paul-d'Abbotsford

A compact, carefully executed installation for integrating a Fujitsu heat pump into a room where every detail mattered

In Saint-Paul-d'Abbotsford, this Fujitsu AIRSTAGE Altair 500 wall-mounted heat pump installation perfectly illustrates the type of project we regularly carry out at AirGreen: adding an efficient heating and cooling system to an already furnished room without compromising the available space, the wall’s aesthetics, or the room’s everyday use.

In the installation photo, the Fujitsu indoor unit was positioned very close to the ceiling, immediately beside a window and its curtain rod. This configuration required special attention. It was not enough to choose a location where the appliance would physically “fit.” We also had to consider the clearance around the unit, the direction of the airflow, the routing of the refrigerant lines, condensate drainage, and the final appearance.

The result is a discreet HVAC installation, with a white wall-mounted unit that blends naturally into the room and connections that have been neatly grouped on the left side of the appliance.

The Fujitsu AIRSTAGE Altair 500 series is a single-zone heat pump line available in capacities of 9,000, 12,000, 18,000, 24,000, 30,000, and 36,000 BTU. Fujitsu documentation also specifies that this series uses R-32 refrigerant, operates in heating mode down to -15 °C, and combines air conditioning and heating in a ductless wall-mounted system.

Why the indoor unit’s location was particularly important

The choice of location for a wall-mounted heat pump directly affects its actual comfort.

In this installation in Saint-Paul-d'Abbotsford, several elements were close together:

• the ceiling;
• the corner of the room;
• the window;
• the metal rod;
• the curtain;
• the passage of the lines to the outside.

We therefore sought to maximize the available wall space while maintaining a logical position for airflow.

The unit was installed high enough to promote good air distribution throughout the room. This is particularly useful for air conditioning, since the cooled air can then gradually spread throughout the occupied area.

It was also necessary to prevent a curtain from hanging directly in front of the air outlet. An obstruction in front of the motorized louver can reduce air distribution and make it seem as though a properly sized heat pump is not cooling evenly.

A clean finish despite the window being immediately adjacent

The photo shows a detail that we consider very important in our installations: managing the routing of the lines.

When the indoor unit is installed near a window, it is sometimes impossible to route the lines out exactly behind the center of the unit. We must then determine the shortest and cleanest route without creating an unnecessary buildup of duct covers indoors.

Here, the connections were grouped on the left side of the unit, with a compact transition to the wall outlet.

This type of work may seem secondary when comparing quotes for heat pumps in Montreal, Laval, Longueuil, on the North Shore or the South Shore, but it makes a significant difference once the installation is complete. Poor planning can leave long sections of line-hide visible, complicate drain drainage, or require a less suitable location for the indoor unit.

Fujitsu AIRSTAGE Altair 500: a new generation using R-32

The Fujitsu Altair 500 uses R-32 refrigerant. According to the documentation provided by Fujitsu, its global warming potential is 675, compared with 2,088 for R-410A, representing a stated 68% reduction in GWP.

For a homeowner, the choice of a heat pump obviously does not depend solely on the type of refrigerant. We also consider:

• the required capacity;
• the efficiency;
• the capacity available in cold weather;
• the noise level;
• the physical dimensions;
• the electrical characteristics;
• the possible piping length;
• the layout of the house.

R-32 is nevertheless one of the features that sets this generation of units apart from the many R-410A heat pumps installed in Quebec in recent years.

A range covering 9,000 to 36,000 BTU

The Altair 500 family includes six sizes.

The Fujitsu technical data sheet lists nominal cooling capacities of 9,000, 12,000, 18,000, 22,000, 30,000, and 33,000 BTU/h, commercially corresponding to models 09KPAS1, 12KPAS1, 18KPAS1, 24KPAS1, 30KPAS1, and 36KPAS1. In heating mode, the nominal capacities are respectively 10,000, 14,000, 18,000, 24,000, 30,000, and 34,000 BTU/h.

This does not mean that capacity should simply be selected based on floor area.

When preparing our estimates, we must also consider, among other factors:

• insulation;
• the number of windows;
• solar exposure;
• ceiling height;
• the floor where the unit is located;
• adjacent rooms;
• natural air circulation;
• actual winter heating requirements.

An oversized unit can reach its setpoint too quickly and run for less time at low output. An undersized unit, on the other hand, may run almost continuously when it is very hot or very cold.

Inverter technology: modulate rather than simply start and stop

The Altair 500 series uses an Inverter compressor.

Unlike a simpler design that operates essentially at full capacity or is off, the Inverter allows the compressor to adjust its operation according to demand.

In a room like the one shown in this installation, this helps maintain a much more stable temperature.

As the room approaches the desired temperature, the unit can reduce its output instead of causing large on-off cycles.

For the customer, this generally translates into:

• more consistent comfort;
• quieter operation;
• better temperature modulation;
• energy consumption better suited to actual demand.

Fujitsu also indicates that H Series AIRSTAGE systems can deliver energy savings of up to 30%, depending on operating conditions and the application.

As low as 19 dB for some indoor units

Noise is one of the most underestimated criteria when choosing a wall-mounted heat pump.

This becomes particularly important when the unit is installed in a bedroom, office, or space used in the evening.

According to the Fujitsu specifications, the 9,000 and 12,000 BTU Altair 500 indoor units can reach as low as 19 dB(A) in quiet mode. The 18,000 BTU model is rated at 26 dB(A), the 24,000 BTU model at 31 dB(A), and the 30,000 and 36,000 BTU models at 32 dB(A).

The series offers six fan speeds plus automatic mode.

This modulation is interesting because a unit does not need to operate continuously at its maximum airflow rate. When demand is low, a reduced speed can maintain the temperature without causing excessive air circulation in the room.

A ProCore heat exchanger designed to improve durability

The documentation for the Altair 500 series also features ProCore coils made of highly corrosion-resistant copper. Fujitsu additionally mentions a heat exchanger with Hydro Fin fins designed to improve corrosion resistance and the durability of the heat exchanger.

For us, the durability of a heat pump nevertheless always depends on the system as a whole.

Even an excellent unit must be installed correctly.

This includes, in particular:

• properly made flared connections;
• an adequate vacuum;
• a leak test;
• a drain installed with the proper slope;
• a compliant electrical supply;
• outdoor positioning that complies with clearance requirements;
• regular maintenance of the filters and heat exchangers.

The quality of the unit and the quality of the HVAC installation must therefore be considered together.

The technical details that truly affect the quality of a wall-mounted heat pump installation

Different piping dimensions depending on capacity

A particularly useful aspect of the Altair 500 technical specifications concerns the dimensions of the refrigerant lines.

Fujitsu specifies:

• 9,000 and 12,000 BTU: 1/4 in. liquid and 3/8 in. gas;
• 18,000 and 24,000 BTU: 1/4 in. liquid and 1/2 in. gas;
• 30,000 and 36,000 BTU: 3/8 in. liquid and 5/8 in. gas.

This detail becomes particularly important when replacing an old heat pump.

You should never assume that existing piping will automatically be compatible with a new unit simply because the two systems have approximately the same capacity.

Before proposing the reuse of existing lines, we must verify their diameter, condition, length, the refrigerant used by the previous system, and the manufacturer's exact requirements.

Up to 164 feet of piping on the largest models

Installation flexibility also varies depending on capacity.

The technical specifications indicate a maximum length of:

• 66 ft for the 9,000 and 12,000 BTU models;
• 98 ft for the 18,000 and 24,000 BTU models;
• 164 ft for the 30,000 and 36,000 BTU models.

The stated maximum vertical differences are 49, 82, and 98 feet, respectively, depending on the capacity category.

In a home where the outdoor unit must be positioned far from the indoor unit, these limits become essential.

A long line set also requires more rigorous execution: pipe supports, insulation, refrigerant quantity, pressure losses, outdoor protection, and future access for servicing.

208–230 V power supply and circuit breaker sizing

All models presented in the Altair 500 specifications operate on a 208 to 230 V, 60 Hz, single-phase power supply.

The required circuit breaker capacity varies by model:

• 15 A for the 9,000, 12,000, and 18,000 BTU units;
• 20 A for the 24,000 BTU model;
• 30 A for the 30,000 and 36,000 BTU models.

For a heat pump installation, we therefore always check the electrical conditions before commissioning.

This prevents discovering at the end of the project that a panel is overloaded, a circuit is unsuitable, or additional work by an electrician is required.

Heating down to -15 °C: understanding this feature correctly

Fujitsu documentation indicates an official heating operating range of -15 °C to 24 °C for models in the Altair 500 series.

This is an important point for Quebec homeowners to understand.

This series can provide heating during a significant portion of the fall, winter, and spring, but it should not be confused with certain heat pumps specifically designed to maintain operation at temperatures of -25 °C, -30 °C, or lower.

The right choice therefore depends on the objective.

For some homes, an Altair 500 can be a highly effective heating solution when combined with another heat source. In other situations, where the heat pump must provide the maximum possible share of heating during periods of extreme cold, we may recommend a series designed for lower outdoor temperatures.

At AirGreen, we prefer to explain this difference clearly rather than present all heat pumps as if they had exactly the same winter performance.

Cooling down to 50 °C outdoors

In cooling mode, the stated operating range extends to 50 °C outdoors. For the 18,000 to 36,000 BTU models, Fujitsu also indicates a special cooling mode that, when configured, allows certain operating conditions to be extended down to -20 °C for specific applications.

For a standard residential installation in Saint-Paul-d'Abbotsford, the main benefit is clearly the ability to maintain comfort during the hot and humid days of the Quebec summer.

Dehumidification: an important advantage in our climate

A heat pump is not used solely to lower the temperature.

In summer, a significant part of comfort comes from reducing humidity.

The Altair 500 specifications indicate a moisture-removal capacity ranging from 1.12 L/h for the 9,000 BTU model to 4.9 L/h for the 36,000 BTU model, depending on the model and test conditions.

Proper sizing remains essential here as well. A unit that cools too quickly may reach the desired temperature before running long enough to remove as much humidity as desired.

One included remote control and several control options

The Altair 500 series comes with a backlit wireless remote control, with illuminated buttons.

Fujitsu also offers several optional accessories:

• Wi-Fi adapter;
• wired controllers;
• BACnet interfaces;
• Modbus interfaces;
• Cielo controllers;
• 24 V thermostat interfaces;
• connection options for certain building management systems.

This flexibility can be useful both for a residence and for certain small commercial spaces.

What we wanted to avoid with this installation in Saint-Paul-d'Abbotsford

In a configuration near a window like this one, several mistakes could have compromised the result.

The first option would have been to place the unit too close to the curtain. Another would have been to create a long, visible cable-trunking route through the room simply to make the exterior work easier.

We also wanted to avoid installing a unit too low or off-center without reason, which would have reduced the overall visual quality.

The challenge of a good installation is therefore not limited to connecting four elements — copper, drain, power supply, and communication. They must be coordinated with the room’s actual architecture.

Our approach to installations in Montreal, Laval, Longueuil, on the North Shore, and on the South Shore

We encounter different situations every day.

In Montreal, installations are often found in duplexes, triplexes, or buildings where outdoor space and piping routes are limited.

In Laval and on the North Shore, we frequently work in detached homes where the best location must be determined among several façades.

In Longueuil and on the South Shore, projects can range from a simple wall-mounted system to much more complex multi-zone or central installations.

In Saint-Paul-d'Abbotsford, as elsewhere, our approach remains the same: we seek a balance between the machine’s performance, the simplicity of the refrigerant routing, drainage, accessibility for maintenance, and the final appearance.

Our advice before buying a Fujitsu Altair 500

Before choosing this heat pump or another series, we recommend checking several points.

First, you need to determine the capacity actually required. Then, you need to confirm whether the heating range down to -15 °C fits your heating strategy.

You also need to consider the location of the indoor unit, not just that of the outdoor compressor.

An indoor installation near a window, as in this project, requires precise planning of the clearances and line-set route.

Finally, if you are replacing an old heat pump, always ask whether the existing lines can actually be reused. The diameters required by the Altair 500 vary considerably depending on the capacity.

A successful installation can also be judged after the technicians have left

Once the heat pump is installed, the goal is for it to simply become a functional part of the home.

In this installation in Saint-Paul-d'Abbotsford, the Fujitsu indoor unit occupies a relatively constrained space, but its positioning remains clean, elevated, and consistent with the room’s layout.

That is exactly what we look for in our projects: a wall-mounted heat pump that provides the expected heating and cooling without making it seem as though the entire room had to be arranged around it.

The Fujitsu AIRSTAGE Altair 500 offers an interesting combination of inverter technology, quiet operation, R-32 refrigerant, a ProCore heat exchanger, various capacities, and control options. The official technical data sheet also confirms Energy Star compatibility for several capacities, with different classifications depending on the model.

At AirGreen, we complement these specifications with what is not always visible in a brochure: precise location selection, quality refrigerant connections, proper drainage, electrical verification, neat line-set finishing, and rigorous commissioning.

For a Fujitsu heat pump installation in Saint-Paul-d'Abbotsford, Montreal, Laval, Longueuil, the North Shore, or the South Shore, choosing the right unit matters greatly. How it is installed matters just as much.