FUJITSU CENTAURI R32 Central Heat Pump | 3 Tons - 36000 BTU

A 3-tonne power plant designed for our winters, with a level of comfort that can be felt in every room

A central heat pump isn't a "technical" purchase reserved for experts: it's a choice for everyday comfort. When the system is properly sized, installed, and adjusted, the difference is very noticeable: the different floors finally reach a similar temperature, the air is more consistent, the house stabilizes quickly after a door is opened, and you stop "chasing" cold spots.

In the Montreal , Laval , and Longueuil area, as well as on the North and South Shores, homes are very diverse: brick duplexes, cottages from the 80s and 90s, recent open-concept constructions, and partial renovations where insulation is excellent in some areas and average in others. This context has a direct consequence: the performance of a central heat pump depends as much on the unit itself as on the air distribution, the settings, and the thoroughness of the initial start-up.

The FUJITSU CENTAURI R32 3-tonne (36,000 BTU) unit catches our attention precisely for this reason. It falls into a category where a rare balance is sought: stable heating operation, finer modulation (rather than "on or off" cycles), and a ducted design that allows comfort to be distributed throughout the house without multiplying the number of wall units.

The exact system specifications (useful for submissions, compatibility, and tracking)

To avoid model errors (a more common problem than you might think), here are the identifiers we use in our documents and during validation:

• Outdoor unit (model) : AOUH36KUAS1

• Indoor unit (model) : AMUH36KUAS

• AHRI : 217290596

• ENERGY STAR® : Yes (including Cold Climate)

• Size : 3 tons | 36,000 BTU

• Refrigerant : R-32

• Wi-Fi : Optional

• Voltage : 220V

• MCA / MOP : 25A / 25A

• Noise level (indoors) : up to 31 / 46 dB(A) depending on operation

• Noise level (outdoors) : 56 dB(A)

• Warranty (Compressor – Parts – Labor) : 12-12-0 years (extended warranty available)

These elements have concrete value: they serve to confirm conformity, to choose the right accessories, to avoid thermostat/control incompatibilities, and to maintain clear traceability over the years (service, maintenance, parts, updates).

What “3 tonnes / 36,000 BTU” really means (and why sizing changes everything)

Two common misconceptions are:

• “Bigger = more comfortable.”

• “If it’s getting very hot, it’s definitely optimal.”

In reality, a 3-tonne system is perfect… when it's the right size . An oversized system can:

• linking short cycles (start/stop);

• reduce dehumidification in summer (less pleasant comfort, “heavy” feeling);

• accentuate temperature variations between floors;

• prematurely wear out certain components.

Conversely, an undersized system can:

• struggling during cold spells or during large temperature changes (returning from work, cold house);

• maintain uneven comfort in distant rooms;

• requesting additional funding, if available, may increase costs.

At AirGreen, we treat sizing as a precision step. We examine the volumes, the condition of the building envelope, wind exposure, windows, the presence of a basement (often cooler), and especially the reality of existing ductwork. A central heat pump may look excellent on paper, but if the air isn't properly delivered to the right places, the client won't benefit from their investment.

Why R-32 is of so much interest in 2025 (without unnecessary jargon)

The R-32 refrigerant is becoming increasingly prevalent in the industry. For the owner, the key is not to memorize a number, but to understand the intention: a more modern refrigerant, designed for new high-efficiency ranges, with a logic of market evolution towards more responsible and high-performing solutions.

In real life, it doesn't change your routine. It mainly changes the design logic: manufacturers are developing entire platforms around these new refrigerants, with modulating compressors, finer controls, and improved performance in more variable conditions.

Efficiency and stability: what we observe in ducted houses

When we talk about efficiency, there's the theoretical value… and then there's the everyday experience. On a properly calibrated system, the customer typically notices:

• a more constant temperature, with fewer “peaks”;

• a more even distribution between rooms;

• improved comfort at night (bedrooms are often the ultimate test);

• a quieter operating noise, especially when the fan is properly configured.

In many homes in the greater Montreal area, comfort complaints stem not from heating capacity, but from distribution: too much air on the ground floor, not enough upstairs, insufficient air return, or poorly balanced ductwork. A unit like the FUJITSU Centauri truly shines when these issues are addressed, because then the modulation and adjustments can genuinely work to improve comfort.

What the FUJITSU CENTAURI R32 brings to a real-world installation (Montreal, Laval, Longueuil)

Ducted indoor unit: a major advantage in renovation (and "home-centric" comfort)

The AMUH36KUAS indoor unit integrates into a ducted system, which is often the most logical option when:

• the house already has a network of pipes;

• we want to avoid multiple visible wall units;

• We are looking for uniform comfort, rather than very localized “zone” comfort.

In our projects, the value of the central unit is particularly evident because:

• families who want a stable temperature in several rooms;

• houses where the open area masks an imbalance (comfortable living room, colder bedrooms);

• owners who want a clean, discreet, and sustainable solution.

Indoor noise level : this is often underestimated. When the mechanical room is close to an office, bedroom, or family room, quiet operation is a real advantage. A central system can become "invisible" when the acoustics are well managed (mounting, insulation, connections, fan speeds).

Outdoor unit: location, clearances, snow and vibrations — the local reality

In Quebec, the outdoor unit does not live in an “ideal” environment. It lives with:

• snow, ice, thaws;

• the winds;

• accumulations at the edge of the roof;

• neighborhood constraints (noise and placement);

• the need for easy access for maintenance and service.

That's why installation is just as important as the brand. We choose the location with future maintenance, clearances, vibration management, and protection against accumulation in mind. A unit installed too low or with insufficient clearance can lose performance and trigger unnecessary operating conditions. A properly positioned unit on a suitable support prevents problems season after season.

Optional Wi-Fi: useful when used correctly (otherwise, useless)

When properly integrated, Wi-Fi becomes a practical tool:

• adjust the temperature remotely (return from a trip, late arrival);

• monitor certain behaviors (deviations, instructions, schedules);

• simplify home management if you have multiple occupants.

But the key point is that Wi-Fi is no substitute for proper initial setup. A high-performing, correctly balanced central system doesn't require daily adjustments to the thermostat. Our goal is for you to set a sensible temperature and for your home to remain comfortable without constant intervention.

Auxiliary heating: insurance, not a plan A

In some cases, a backup (often electric) may be relevant, particularly if:

• the house has significant losses;

• Renovations are planned but not yet carried out;

• You want additional security during extreme peaks.

The idea is not to depend on the backup: the idea is to protect your comfort in particular scenarios, while maintaining efficient main operation most of the time.

AirGreen case studies: what it looks like in practice

These are scenarios very close to what we see every week.

Case 1 — Cottage in Laval (residential area, existing conduits)
The client had an aging system and complained mainly about the upstairs: too hot in summer, too cold in winter. After inspection, the problem wasn't just the unit: the air return was limited and some dampers were improperly adjusted.
Our intervention consisted of:

• validate the sizing of the power plant;

• correct the balancing of certain conduits (flow rates and distribution);

• optimize ventilation settings.
  As a result, the house “stabilized” more quickly and the upper floor became habitable without over-regulation or over-ventilation.

Case 2 — Longueuil (family home, comfort of rooms is a priority)
The main need: more consistent rooms, free from disturbing noise at night. Here, the focus has been on:

• selecting the most consistent configuration;

• noise control (connections, supports, fan speed, transitions);

• fine-tuning at startup.
  When you get this trio right, the central unit becomes almost imperceptible, and that's exactly what many families want.

Case 3 — Montreal (renovation, constrained mechanical space)
A typical project: a narrow mechanical room, limited clearance, and an owner who wanted a clean and sustainable solution. The key was:

• route planning;

• electrical compliance;

• Condensate and drain management (often neglected, but essential).
  In these houses, the success of a central system often hinges on logistics and details.

AirGreen pre-installation checks: what we measure, what we correct

For a homeowner, it's difficult to know if an installer is "doing things right." Here are our checkpoints, the ones that make the difference between a decent central heating system and a remarkable one:

1. Condition of the conduit network

   • visible leaks, weak connections, unsuitable sections;

   • air return quality;

   • areas “starved” for bandwidth, especially upstairs.

2. Airflow and balance

   • adjustments by register;

   • consistency between parts;

   • correction of excesses (blowing too hard) and deficiencies (parts that remain behind).

3. Electricity and compliance

   • appropriate protections (MCA/MOP);

   • clean path;

   • secure and logical connections for the service.

4. Condensate management

   • slope, siphon, safety;

   • prevention of odours, backflows, overflows;

   • Pump selection if necessary, depending on configuration.

5. Outdoor location and longevity

   • vibrations, clearances, snow;

   • future access;

   • A clean installation that withstands the seasons.

The most common mistakes (and how to avoid them from the start)

Certain mistakes are constantly repeated in the market, even by "good brands." They explain a large part of the dissatisfaction:

• Neglecting the ductwork : a central unit is not a wall unit. Without a coherent air network, comfort will never be consistent.

• Ignoring air return is one of the best predictors of comfort. Insufficient return creates imbalances, noise, and inefficient distribution.

• Install the outdoor unit “where it fits” : in Quebec, placement must take into account snow, drainage, clearances, and service.

• Rushing the initial settings : a central heating system must be started up methodically. The settings directly influence the feeling of comfort.

At AirGreen, we have a rule: if the customer has to struggle with their thermostat or get used to uncomfortable zones, that's not an acceptable outcome. A central heat pump should simplify your daily life, not add to it.

Why choose AirGreen for a Fujitsu central unit in this category?

A central heat pump involves several functions simultaneously: refrigeration, ventilation, air distribution, electricity, and drainage. AirGreen's value lies in treating everything as a complete system.

• Free on-site assessment : we verify the reality of the ducts and constraints before making a recommendation.

• Transparent pricing : a clear offer, with no surprises at the end.

• Professional refrigeration technicians : our strength lies in both installation and after-sales service.

• Payment only at the end : you pay when you are satisfied with the result.

We serve Montreal , Laval , Longueuil , the North Shore and the South Shore daily, and we adapt the solution to the home, not the other way around.

Who is the FUJITSU CENTAURI R32 3 tonne (36,000 BTU) intended for?

This model is particularly relevant if you are looking for:

• a reliable and stable central heat pump for heating in a demanding climate;

• consistent comfort across multiple rooms, without multiplying the visible units;

• a modern system with R-32 , control options, and a durable installation;

• a professional approach where sizing, ductwork and adjustments are treated with seriousness.

Contact AirGreen!
For accurate recommendations, sizing validation, and careful installation of your FUJITSU CENTAURI R32 36,000 BTU central heat pump , contact AirGreen. We schedule an on-site visit in Montreal , Laval , Longueuil , the North Shore , and the South Shore , and then provide you with a clear, comprehensive, and compliant quote.