GENERAL AIRSTAGE CENTAURI XLTH R32 Central Heat Pump | -26°C | 4 Tons - 48000 BTU

GENERAL AIRSTAGE CENTAURI XLTH AMUH48KUAS 48,000 BTU: a 4-Ton Central Heat Pump for Large, Wind-Exposed Lots

Under the GENERAL name, the AMUH48KUAS air handler paired with the AOUH48KUAH1 outdoor unit is exactly the same machine as the Fujitsu AIRSTAGE CENTAURI XLTH 48,000 BTU. Only the name has changed: Fujitsu General Limited, the manufacturer, has been called GENERAL Inc. since January 1, 2026. You get the same manufacturer's spec sheet and the same warranty, whichever label you pick.

We recommend this system for one very specific kind of home: the large property built on an open lot, with no woods or neighbours to break the wind. On L'Île-Bizard, plenty of homes face Lac des Deux Montagnes or wide open land. In January, the front of the house takes the gusts head-on, the house loses heat faster, and that is exactly where the winter heating load peaks.

The CENTAURI XLTH outdoor unit was designed for that kind of winter. The manufacturer gives it a heating range that goes down to −26 °C, and a cooling range of −21 °C to 50 °C. On certifications, the system is recognized as ENERGY STAR Cold Climate and appears on Hydro-Québec's LogisVert list. In other words, a 4-ton central heat pump built to heat through deep cold, and not just in spring and fall.

GENERAL or Fujitsu AIRSTAGE: the same machine

The new name follows the manufacturer's acquisition, in August 2025, by Paloma Rheem Holdings, owner of Rheem since 1988. Everything else stayed put: Kawasaki, Japan, remains home base for the head office and for research, the factories have not changed, and the AIRSTAGE line keeps its model numbers as well as its warranty program. The Fujitsu name will gradually disappear from the cabinets; in the meantime, you will find the same machine under either brand.

If we show both product pages, it is so you can compare them line by line: you will see there is nothing to choose between them. The decision comes down to the name you would rather see on the unit.

The Fujitsu version stays online if you want to check for yourself: here is the Fujitsu AIRSTAGE CENTAURI XLTH 48,000 BTU page.

A central heat pump does not go in like a wall-mounted unit. The indoor unit is an air handler: it sits in the basement, a utility closet, a finished attic or a crawl space, pushes heated or cooled air through the home's ductwork, then draws it back through the return air. The AMUH48KUAS is multi-position. Upflow, downflow with the UTD-DFMMB1 kit, horizontal left or horizontal right: the orientation follows the room, not the other way around. In a large house, we can therefore adapt to the existing mechanical room instead of rebuilding it around the unit.

On an exposed lot, what matters is what the heat pump delivers once the cold settles in for good. The certified listing for this system shows 34,000 BTU of heating at −8 °C, with a COP of 2.86, and 51,000 BTU at −15 °C, where the COP stands at 1.96. These are two different test points: we present them as they are, without setting one against the other. The manufacturer's spec sheet, included with the product, gives the full performance data and dimensioned drawings.

Let's also talk about limits. Below −26 °C, the unit leaves the operating range stated by the manufacturer, and depending on the house's heat loss, backup can become useful before that point. For those hours, the air handler can run backup heat under several control logics. The manufacturer offers compatible electric heat kits for this, sold separately and wired to their own power supply. The whole idea of the XLTH is to keep that backup in a supporting role.

Seasonal efficiency shows in the certified values:

• SEER2 of 19.0 and EER2 of 11.2 in cooling;
• HSPF2 of 10.2 in heating;
• AHRI certificate 217895718 and ENERGY STAR ID 4511774;
• dehumidification of 4.7 pints/h, welcome on muggy July days.

A large house also means long ducts and plenty of grilles. On the air side, the unit delivers a maximum airflow of 1,600 CFM, against an external static pressure ranging from 0.2 to 0.8 in. WC. We check the ductwork during the visit, because an undersized network or a return air that is too small pushes pressure and noise up, no matter how good the unit is.

On noise, count on 34 to 51 dB(A) for the indoor unit and 60.0 dB(A) for the outdoor unit. A large lot offers a luxury that is rare in the city: choosing the location. We place the outdoor unit away from bedroom windows and clear of the snowdrifts the wind piles up, on a well-chosen pad or stand. At 37.01 × 12.60 × 54.33 in., it is a tall, shallow unit that tucks neatly along a wall.

Installation follows a clear sequence:

1. inspection of the ductwork, supply and return air;
2. setting the air handler and the plenums, with an access panel for service and the filter;
3. 3/8 and 5/8 in. refrigerant line run to the outdoor unit, along with its cable and the drain;
4. 208/230 V power supply (MCA of 29 A, maximum overcurrent protection of 40 A), plus the dedicated circuit for the backup kit;
5. system start-up and final adjustments, in the hands of a refrigeration technician.

AirGreen is an AIRSTAGE Elite Plus installer, and this system runs on R-32 refrigerant. The indoor unit has a built-in leak detection system.

No control comes with the system, which leaves you free to pick the one that suits the house:

• Wi-Fi, run from the AIRSTAGE Mobile app;
• the UTY-TTRXZ1 interface, if you prefer a third-party 24 V thermostat;
• wired controllers: KAGAMI UTY-RVRU or UTY-RNRUZ5;
• an IR receiver kit, with its wireless remote;
• BACnet or Modbus protocols, for a property run by a building management system.

On integration, the unit has its own input/output terminals: a humidifier, an HRV or ERV, a fire alarm, a door switch or backup heat all connect to them. In a large house, the air exchanger and the humidifier are often part of the equipment; here they coordinate with the heat pump instead of each doing its own thing. With a compatible controller, service monitoring becomes possible too.

Maintenance stays simple: a clean filter, clear grilles and an outdoor unit kept free of snow. For the filter, the manufacturer offers a 20 × 20 in. base as an option. A machine of this calibre is bought for the long haul, and the warranty keeps pace: a 12-year term on the compressor and parts, and a 6-year term on labour.

The LogisVert amount shown for this system, according to Hydro-Québec's list of October 27, 2026, is $4,080. Eligibility conditions are Hydro-Québec's; the AHRI and ENERGY STAR numbers your file will need are in the table.

This system is cut out for:

• the large home already fitted with ductwork, on a lot open to the wind or by the water;
• the owner who wants the heat pump to carry the heating in deep cold and save backup for the worst hours.

On the other hand, if the house is small or well sheltered, 4 tons will likely be too much. A smaller system will then do a better job, and we will tell you so plainly during the visit.

A free quote for your L'Île-Bizard property

For an on-site assessment and a free quote, call AirGreen at 514 316-2973. We look at the ductwork, the mechanical room and the outdoor unit location, then present the system under the GENERAL or Fujitsu name, whichever you prefer.

An HVAC contractor, AirGreen covers Montreal, Laval, Longueuil, the North Shore and the South Shore, L'Île-Bizard included.