Installation of a Fujitsu AIRSTAGE Altair 700 wall-mounted heat pump in Saint-Patrice-de-Sherrington, Montérégie
Installation of a Fujitsu AIRSTAGE Altair 700 in Saint-Patrice-de-Sherrington: R-32 wall-mounted heat pump, inverter, elevated outdoor support, 1/4–3/8 in. piping, and meticulous HVAC installation by AirGreen.
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.
A Fujitsu Altair 700 installation designed for the climate of Saint-Patrice-de-Sherrington
In Saint-Patrice-de-Sherrington, a wall-mounted heat pump installation must be planned with both the building and outdoor conditions in mind. For this project, we installed a Fujitsu AIRSTAGE Altair 700 wall-mounted heat pump, a single-zone system using R-32 refrigerant and designed to provide both summer cooling and heating during much of the Quebec winter.
The photo taken after our work shows an important detail that distinguishes a properly executed HVAC installation from an improvised one: the outdoor unit is securely mounted on a metal wall bracket rather than placed directly at ground level. The refrigerant lines are grouped, protected, and carefully insulated, following a compact route along the brick wall.
This configuration is particularly relevant in an area such as Saint-Patrice-de-Sherrington, where snow accumulation and freeze-thaw cycles must be considered when choosing the location of the outdoor unit.
The Fujitsu AIRSTAGE Altair 700 range presented in the technical documentation includes the 9,000 BTU/h 09KMAS1 and 12,000 BTU/h 12KMAS1 models. The outdoor photo of this installation does not show the unit’s nameplate, so we cannot visually determine which of these two capacities was installed without this additional information. However, both configurations share several essential characteristics: 208–230 V power supply, a 15 A circuit, R-32 refrigerant, and 1/4 in. liquid and 3/8 in. gas refrigerant lines.
Why the Fujitsu Altair 700 was well suited to this installation
For a wall-mounted heat pump in Saint-Patrice-de-Sherrington, nominal capacity is only part of the equation. We also consider the system’s behavior under partial load, its sound level, its operating range, the flexibility of the piping lengths, and how the unit can be integrated into the building without unnecessarily complicating the installation.
The Altair 700 series uses an Inverter compressor. Unlike a unit that operates primarily by switching on and off, the Inverter allows the heat pump to adjust its capacity according to actual demand. Once the indoor temperature is close to the setpoint, the system can reduce its output instead of repeatedly starting at full capacity.
The desired result is simple: a more stable room temperature, fewer sudden fluctuations, and electricity consumption better adapted to actual needs.
Fujitsu documentation also indicates a heating operating range down to -15 °C, as well as a cooling range of -10 °C to 50 °C for both capacities in the series.
This means that when shopping for a heat pump in Quebec, it is important to distinguish between two concepts: the presence of a heating mode and the unit’s actual ability to meet a property’s heating needs when temperatures drop significantly. A professional building assessment therefore remains essential.
High energy efficiency ratings across the two available capacities
The Fujitsu AIRSTAGE Altair 700 delivers particularly impressive performance data for a wall-mounted heat pump.
For the 9,000 BTU 09KMAS1 model, the technical sheet indicates, among other things:
- a nominal cooling capacity of 9,000 BTU/h;
- a cooling modulation range of 3,100 to 12,100 BTU/h;
- a nominal heating capacity of 12,000 BTU/h;
- a heating modulation range of 2,800 to 14,500 BTU/h;
- a SEER2 of 30.0;
- an HSPF2 Region V of 9.9;
- a 16.4 EER2;
- a COP2 of 4.64.
For the 12,000 BTU 12KMAS1 model, Fujitsu indicates:
- a nominal cooling capacity of 12,000 BTU/h;
- a cooling range of 3,100 to 13,800 BTU/h;
- a nominal heating capacity of 14,000 BTU/h;
- a heating modulation range of 2,800 to 15,000 BTU/h;
- a SEER2 of 27.5;
- an HSPF2 Region V of 8.5;
- a 13.5 EER2;
- a COP2 of 4.32.
Both units are ENERGY STAR certified, including the climate designations shown on the manufacturer's technical specifications.
For our customers in Montreal, Laval, Longueuil, the North Shore, the South Shore, and Montérégie, these figures are much more useful than simply comparing the number of BTUs printed on a box. They make it possible to understand how the system performs over an entire season.
R-32: an important technical choice in this new generation of Fujitsu equipment
In the photo of this installation, the label R32 is clearly visible on the outdoor unit's panel.
The Fujitsu Altair 700 does indeed use R-32 refrigerant. According to the manufacturer's document, its global warming potential is 675, compared with 2,088 for R-410A, representing an announced reduction of approximately 68% in GWP.
For us, this transition to R-32 also means working with the installation methods, tools, and practices suited to next-generation equipment.
Simply replacing an existing heat pump with a new unit is never enough without checking the compatibility of the entire installation.
1/4 in. – 3/8 in. piping and up to 66 feet of permitted routing
The piping is one of the details we systematically check before a Fujitsu heat pump installation.
For the 9,000 and 12,000 BTU Altair 700 models, Fujitsu specifies:
liquid: 1/4 in.
gas: 3/8 in.
The stated minimum length is 10 feet, while the maximum length can reach 66 feet. The maximum permitted vertical difference is 49 feet. The specifications also mention a precharge covering up to 49 feet of piping.
These figures become especially important when the indoor unit and outdoor unit cannot be placed back to back.
In this installation in Saint-Patrice-de-Sherrington, the visible routing remains particularly clean. The lines leave the building and are directed toward the outdoor unit without unnecessary detours. The black insulation is secured along the support, which reduces movement and helps keep the installation tidy.
A wall-mounted outdoor unit: a very useful detail in Quebec
The choice of outdoor support deserves particular attention.
For this project, the Fujitsu AIRSTAGE is mounted on a metal structure anchored to the building. This configuration keeps the unit elevated above the surface beneath it.
In a real-world HVAC installation in Quebec, this decision can help limit several problems:
- snow accumulation around the heat exchanger;
- obstruction of the bottom of the unit;
- ice directly beneath the heat pump;
- prolonged contact between the chassis and ground moisture;
- difficulty accessing it during certain maintenance work.
However, a common mistake must be avoided: raising the unit does not mean it can be positioned anywhere.
We must maintain the necessary clearances for airflow, verify the strength of the support, and plan how the water produced during defrost cycles will drain away in winter.
The location visible in the photo also offers a practical advantage: the unit remains accessible without being hidden behind a complex structure.
What this Saint-Patrice-de-Sherrington installation reveals about the quality of an HVAC project
An installation is never just about choosing the heat pump
Two homeowners can purchase exactly the same Fujitsu Altair 700 and achieve very different results if the capacity selection, piping, or positioning was poorly planned.
At AirGreen, we therefore place particular importance on the work that takes place before startup.
We assess, among other things, the area to be conditioned, insulation, windows, sun exposure, room layout, and usage habits. A larger heat pump is not automatically a better heat pump.
An oversized unit can reach its setpoint too quickly and reduce the benefits of variable-speed operation. Conversely, an undersized unit will have to run more and may struggle to meet demand under certain conditions.
The low sound level of the Altair 700
Fujitsu documentation indicates that indoor sound levels can drop as low as 19 dB(A) in quiet mode.
At high speed, the indoor unit is rated at 40 dB(A) in cooling and 42 dB(A) in heating.
On the outdoor side, the 9,000 BTU model is rated at 44 dB(A) in cooling and 47 dB(A) in heating, while the 12,000 BTU model is listed at 48 and 50 dB(A).
These figures explain why the physical location of an outdoor unit remains important even with a modern, quiet heat pump. Near a bedroom, patio, or neighboring property, a difference of a few feet in positioning can noticeably improve acoustic comfort.
A compact indoor unit with built-in Wi-Fi
Both Altair 700 capacities use an indoor unit measuring 32 13/16 in wide, 10 5/8 in high, and 8 3/4 in deep.
The outdoor unit measures approximately 31 7/16 in wide, 21 5/16 in high, and 11 7/16 in deep. Its listed weight is 71 lb.
These relatively compact dimensions make it easier to integrate the system into various residential configurations.
The series also offers built-in Wi-Fi connectivity, enabling remote monitoring and control using the AIRSTAGE app. Fujitsu also provides a range of optional interfaces and controllers, including for certain BACnet, Modbus, and 24 V thermostat integrations.
For a traditional residential installation, built-in Wi-Fi is often the most immediately useful feature: remote temperature control, adjusting settings before returning home, and more convenient day-to-day system management.
The mistakes we want to avoid during a similar installation
The experience gained from our installations of wall-mounted heat pumps in Montreal, Laval, Longueuil, on the North Shore, the South Shore, and in Montérégie always brings us back to the same critical points.
Inadequate piping should never be kept simply because it is already in place. For the Altair 700, the specified dimensions are clearly 1/4 in and 3/8 in.
An existing electrical supply must also be checked rather than assumed to be compatible. For this series, Fujitsu specifies a single-phase supply of 208 to 230 V / 60 Hz with a 15 A circuit breaker.
You should also avoid placing the outdoor unit too close to the ground, neglecting winter drainage, crushing the pipe insulation, or unnecessarily increasing the piping length.
Finally, the choice between 9,000 and 12,000 BTU should be based on the needs of the area rather than a simple approximation based on square footage.
A clean installation today must also remain practical for many years to come
We do not judge an HVAC installation solely by its appearance on the day the tools are put away.
The unit must remain accessible for cleaning, troubleshooting, and maintenance. The outdoor fan must be able to breathe properly. The lines must remain protected. The fasteners must withstand Quebec's seasons.
That is precisely what we look for when planning an installation like this Fujitsu AIRSTAGE Altair 700 in Saint-Patrice-de-Sherrington.
The final photo shows a compact unit installed neatly against a masonry wall, with the piping grouped and protected and a bracket keeping the unit above the lower surface. These details may appear simple, but they are part of the overall quality of a project.
For homeowners currently comparing Fujitsu wall-mounted heat pumps, performance ratings are obviously important. However, they must be considered alongside the appropriate capacity, building type, equipment location, piping quality, and commissioning precision.
It is this combination of equipment selection and installation quality that truly enables a heat pump to deliver the performance for which it was designed.
AirGreen for Fujitsu heat pump installation in Montérégie and Greater Montreal
At AirGreen, we install wall-mounted heat pumps in Greater Montreal and surrounding areas, including Montreal, Laval, Longueuil, the North Shore, the South Shore, and Montérégie.
An installation like the one completed in Saint-Patrice-de-Sherrington illustrates our approach: inspecting the building, selecting the right equipment, planning a logical refrigerant line route, installing the outdoor unit on a base suited to the site, and paying attention to details that will still matter several winters later.
The Fujitsu AIRSTAGE Altair 700 combines Inverter technology, R-32 refrigerant, excellent seasonal efficiency, quiet operation, and a compact design. When properly installed and correctly sized, it is a particularly attractive solution for heating and cooling a residential area.
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).