FUJITSU CENTAURI R32 Central Heat Pump | 1.5 Tons - 18000 BTU

A central heat pump designed for Quebec: stable comfort, precise control, performance in extreme cold

When a homeowner upgrades from individual electric heating, an old furnace, or an outdated A/C + heating system, they're not just looking for "air conditioning." They want consistent comfort in every room, better humidity control, less noise, a more predictable bill, and above all, a system that won't break down as soon as the temperature drops in Montreal , Laval , Longueuil , the North Shore , and the South Shore .

The FUJITSU CENTAURI R32 1.5-tonne (18,000 BTU) unit addresses this reality precisely. It's a compact, efficient central solution designed for both renovation and new construction projects, capable of maintaining reliable performance in winter conditions. The AOUH18KUAS1 (outdoor) + AMUH18KUAS (indoor) combination utilizes a modern inverter platform and a multi-position ducted air handler, which is particularly useful when site constraints demand practical solutions rather than purely theoretical ones.

For whom is this model particularly relevant?

• Owners of single-family or semi-detached houses wanting a discreet central (ducted) solution without compromising on comfort quality.

• Plex and multi-unit dwellings where the aim is to improve air distribution and reduce complaints of cold or overly hot areas.

• Replacement projects: old central system, furnace + A/C, or older generation heat pump.

• Residences where the mechanical location (basement, technical closet, false ceiling) requires a multi-position air handler (installation in upward, left, right, or downward with kit).

Why are so many people turning to a “central” solution?

A wall-mounted unit can be excellent, but a central heat pump offers something highly sought after: a more consistent, “natural” feeling of comfort, because the temperature doesn't depend on a single zone or a localized airflow. For a house with multiple bedrooms, a finished basement, or rooms in remote locations, this approach is often the most logical.

What the FUJITSU CENTAURI R32 18,000 BTU actually delivers in the field

At AirGreen, we love technical specifications… but we love even more what they look like in real-world conditions: imperfect existing ducts, sometimes undersized air returns, rooms exposed to wind, ambient noise, and load variations between mid-season and dry cold.

Below, we detail what really matters to a homeowner, with concrete explanations (and not vague promises).

1) Performance and stability: a system designed for the winter here

One of the major issues in Quebec is not just “does it heat up?”, but how it heats up. A system that alternates between overly aggressive cycles, blows very hot air and then stops for long periods, or loses its stability in cold periods, quickly creates discomfort: variations, cold spots, a feeling of dry air, and noise.

The CENTAURI is designed to maintain solid heating performance in demanding conditions, with a stated capacity down to -21°C . In practice, this helps reduce the feeling of a drop in comfort at night, during cold snaps or strong winds.

What this changes for the customer:

• More stable temperature (fewer perceived variations).

• Fewer abrupt restarts (therefore often less “operating” noise).

• Improved continuity of comfort between mid-season and the depths of winter.

2) Inverter technology: smooth, seamless comfort

The principle is simple: instead of operating in an on/off fashion, the inverter adjusts the compressor speed according to the actual demand. As a result, the system operates more frequently at a moderate pace, which improves comfort, efficiency, and longevity.

In a typical Montreal home (where days can go from mild to cold in a matter of hours), the inverter becomes a very tangible advantage:

• Maintaining a constant temperature despite weather changes.

• Reduction of overheating and underheating.

• Better performance in “real” conditions, not just in the laboratory.

3) R-32 refrigerant: modernity, regulatory consistency, and performance

The CENTAURI uses R-32 , a newer and more environmentally friendly refrigerant than many previous generations. For homeowners in Longueuil and on the South Shore , this is often an important factor: upgrading today also means avoiding becoming tied to a technology that will be less relevant tomorrow.

Beyond the environmental aspect, R-32 is also recognized for its thermodynamic performance, which makes sense: to obtain stable comfort while improving seasonal efficiency.

4) Air handler AMUH18KUAS: ducted, multi-position, practical for renovations

The AMUH18KUAS indoor unit is a multi-position ducted air handler. In practice, this detail makes all the difference. Why? Because the mechanical room is never "perfect." Between beams, existing ductwork, drainage, electrical location, and accessibility for maintenance, a system that adapts is a system that installs better... and is more durable.

Concrete advantages:

• Adaptable to a basement with a low ceiling, a utility closet, or a false ceiling.

• Possibility of cleaner integration into existing conduits.

• Useful flexibility in renovations where you want to avoid rebuilding entire sections of ceiling.

5) Airflow and static pressure: when ducts are not perfect

An often underestimated point: a central heat pump does not "push" air into a vacuum. It does so within a real network, with bends, transitions, grilles, sections that are sometimes too small, and returns that are sometimes limited.

The air handler's ability to handle higher external static pressure is useful when:

• Some sections are longer.

• The network has been modified over the years.

• There are some points of restriction (old shutters, decorative grilles that are too tight, poorly sized ducts).

Our AirGreen approach:
We always validate the distribution logic: air returns, balancing, grille positioning, and mechanical constraints. An excellent heat pump installed on a poorly understood system can provide only "average" comfort — and we aim for a clear, measurable, and stable result.

6) Silence: a real “quality of life” advantage

Noise in HVAC systems is an irritant that becomes part of daily life. A central system can be extremely comfortable… or become a constant inconvenience if the configuration isn't well thought out.

With the CENTAURI, interior noise levels can be very low depending on the mode and speed, which is particularly appreciated when:

• The technical room is close to a family room.

• There are rooms nearby.

• We want discreet comfort, without an “aggressive whirring”.

Important: Silence doesn't depend solely on the machine itself. It also depends on the installation: insulation of certain sections, mounting, vibration management, duct quality, and properly adjusted air velocity. This is precisely where installation expertise becomes crucial.

7) Control, connectivity and integration: Optional Wi-Fi and modern logic

More and more homeowners want simple, clear, and reliable control:

• Stable temperature by zones or by floors (depending on configuration).

• Remote monitoring (second home, prolonged absence).

• Centralized control via thermostat according to project requirements.

CENTAURI offers a flexible approach, with optional Wi-Fi and integration options depending on the configuration. In reality, we primarily help customers choose what's useful—not what's "trendy." Overly complex controls can become a problem; well-chosen controls become everyday convenience.

8) Key technical data: useful guidelines for smart shopping

HVAC comparisons are often confusing. Here are the points that come up most often in customer discussions (and that help to make a "real" comparison):

• Cooling capacity: 18,000 BTU (1.5 tons)

• Exterior model: AOUH18KUAS1

• Interior model: AMUH18KUAS

• AHRI: 217290593 (useful reference for validations and files)

• ENERGY STAR®: Yes

• ENERGY STAR® (Cold Climate): Yes

• Refrigerant: R-32

• Voltage: 220V

• Piping: 1/4 – 1/2

• Outdoor noise level: 55 dB(A) (useful reference depending on location)

• Warranty shown: 12 years compressor / 12 years parts / 0 years labor (additional warranty available under certain conditions)

9) Real-world scenarios: how this model performs with our clients (Montreal, Laval, South Shore)

Case 1 — Renovation in Montreal (duplex, existing ducts)
The homeowner wanted improved comfort in the upstairs bedrooms without installing multiple wall units. The existing ductwork had heat loss, and some areas were slower to circulate. By focusing on distribution (air return, balancing, and adjustments), we stabilized the upstairs temperature and reduced the feeling of drafts. The result: more consistent comfort and greater satisfaction during the shoulder seasons, when on/off systems are often problematic.

Case 2 — House in Laval (finished basement, compact mechanical room)
The challenge was space. Multi-position flexibility simplified the design and avoided risky compromises. The client also wanted quiet operation: once the installation was optimized (fixing, flow adjustments, vibration management), they noticed what we all seek: "you no longer think about the system," because it does its job without being noticed.

Case 3 — South Shore (residential area, remote control)
The owner wanted a modern solution and simple management during absences. Choosing a suitable control configuration allowed for intuitive use: stable temperatures, clear control, and real peace of mind in winter.

10) Common mistakes to avoid with a central heat pump (and how we deal with them)

1. Underestimating air return
   Even an excellent machine cannot "correct" insufficient air return. We assess the flow, the grilles, and the consistency of the network.

2. Choose based solely on tonnage
   The 1.5-tonne capacity is ideal for many scenarios, but the right choice depends on the load, building envelope, insulation, windows, and distribution. We prefer an approach based on actual needs, not a quick estimate.

3. Neglecting the location of the outdoor unit
   A poorly planned location creates problems: perceived noise, vibrations, complicated drainage, snow accumulation, and sometimes clearance constraints. We offer a layout that respects performance, maintenance, and everyday comfort.

4. Forget the interview
   To preserve efficiency and stability:

• Checking and replacing filters according to the configuration.

• Seasonal inspection: cleaning, drainage, functional check, anomaly detection.

• Adjustments if necessary (airflow, parameters, balancing), especially after renovations or changes in layout.

11) Subsidies and value: a major point in the decision

On your product page, a Provincial Grant (LogisVert) of $1932 is displayed. For many families in Montreal , Laval , Longueuil , the North Shore and the South Shore , this is a concrete factor that speeds up the decision: comfort and efficiency are improved while reducing the net cost.

At AirGreen, we help you clarify what applies to your situation (type of building, replacement, criteria), and build a clear project: equipment, installation, and expected result.

12) Why installation makes a difference (and what we do at AirGreen)

A central heat pump is not a “product in a box”. It is a system : sizing, piping, condensate drainage, power supply, configuration, control, and commissioning.

Our goal is simple: that your FUJITSU CENTAURI R32 central heat pump delivers the comfort you choose it for, throughout the season, not just on the day of installation.

What our customers particularly appreciate:

• Free on-site assessment : see the building, the reality of the ducts and constraints.

• Transparent pricing : a clear final offer before the work begins.

• Experienced technicians, structured installation, and attention to detail prevent recurring problems.

• Payment only at the end , when everything is in order and satisfactory.

13) What to expect during an AirGreen on-site appraisal

For many customers, the most reassuring step is this: assumptions are replaced by facts.

During an appraisal, we analyze, among other things:

• The network of conduits (dimensions, path, restriction points).

• The quality and location of the air returns.

• Mechanical constraints (access, drainage, clearance).

• Power supply (220V, protections, capacities).

• Comfort habits and problem areas (rooms that are too cold, too hot, humidity, etc.).

• The real expectations: silence, control, stability, heating performance.

Next step

Are you considering the FUJITSU CENTAURI R32 | 1.5 Ton - 18000 BTU Central Heat Pump for your home in Montreal , Laval , Longueuil , on the North Shore or South Shore ? Contact AirGreen for an on-site assessment and a clear proposal: system selection, HVAC installation, expected performance and options (control, Wi-Fi, integrations).