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Fujitsu
Fujitsu Comfort 4.2kW Reverse Cycle Split System
Cooling4.20kW
Heating4.70kW
Room size25-40 m2
Indoor noise20-44 dB
Warranty5 years
The Fujitsu Comfort 4.2kW reverse cycle split system handles medium-sized rooms with a good balance of heating and cooling output, inverter efficiency, and a low quiet-mode noise level that keeps it practical for bedrooms as well as living spaces.
Final sizing should be confirmed through an on-site assessment, as insulation, ceiling height, glazing, sun exposure and room layout can all affect the right unit choice.
Overview of Fujitsu Comfort 4.2kW Reverse Cycle Split System
▾The ASTH14KNCA pairs with the AOTH14KNCA outdoor unit and delivers 4.2kW of rated cooling and 4.7kW of rated heating. At this capacity it suits rooms in the 25–35 m2 range, including medium bedrooms, open-plan sleeping areas, and home offices. The all-DC inverter compressor operates at continuously variable speed, maintaining set temperature without the large swings associated with non-inverter cycling.
Heating COP is 4.16, meaning the unit returns more than four times the energy in heat for every unit of electricity consumed — a meaningful advantage over resistive electric heating for Hunter Valley winters. The outdoor unit steps up to the 799mm-wide AOTH14KNCA with a 31kg weight, slightly larger than the 09 and 12 variants, but still manageable on a standard wall bracket or ground slab.
Wi-Fi control is not included as standard but can be added via the optional UTY-NXT-BOX adaptor. The demand-response compatibility noted in the spec data means the unit can accept external signals to reduce load during grid peak events, which may be relevant for commercial demand management agreements, though this is rarely applicable in residential settings.
– 4.2kW cooling and 4.7kW heating with all-DC inverter control
– Heating COP of 4.16 for efficient winter operation
– Super Quiet Mode at 20 dB(A) cooling for bedroom compatibility
– R32 refrigerant (850g charge)
– Demand response compatible
– Auto Restart, Sleep Timer, Program Timer, Auto Louvre as standard
Is the Fujitsu Comfort 4.2kW Reverse Cycle Split System right for your home?
▾– Medium bedrooms or master bedrooms in homes across the Hunter Valley
– Home offices with moderate heat load
– Apartments or townhouses where a single medium-capacity unit replaces multiple smaller units
– Rooms up to approximately 30–35 m2
Performance & Efficiency
▾Cooling Capacity
4.2 kW
Heating Capacity
4.7 kW
Recommended Room
25–40 m²
Inverter
Yes
YesEER
3.41
COP (Heating)
4.16
Star ratings from Fujitsu ZERL (average climate zone used): cooling 4/3.5/4 (hot/average/cold); heating 3.5/3/2 (hot/average/cold). Annual EER and annual COP not published by manufacturer.
Noise Levels
▾Indoor Min
20 dB(A)
Indoor Max
44 dB(A)
Outdoor
50 dB(A)
Indoor: 20 dB(A) quiet cooling / 24 dB(A) quiet heating / 44 dB(A) high heating. Outdoor: 50 dB(A).
Power & Installation
▾Power Supply
240V Single Phase
Max Power Input
1.23 kW
Max Current
5.9 A
Max Pipe Length
20 m
Max Pipe Height
15 m
Refrigerant & Environment
▾Refrigerant
R32
Dimensions & Weight
▾Indoor (W×H×D)
834 × 270 × 215 mm
Outdoor (W×H×D)
799 × 541 × 290 mm
Warranty
▾Warranty period
5years
5-year full parts and labour warranty.
Model Details
▾Model NameComfort
Model NumberASTH14KNCA
Indoor UnitASTH14KNCA
Outdoor UnitAOTH14KNCA
Features
▾Quiet Mode
Turbo Mode
Sleep Mode
Energy Efficiency & Performance
▾The ASTH14KNCA achieves a rated EER of 3.41 for cooling and a COP of 4.16 for heating. The COP figure is particularly competitive and reflects the advantage of inverter heat pump heating versus direct electric heating for the Hunter Valley’s cooler winters. At rated conditions, the unit delivers 4.7kW of heating while consuming approximately 1.13kW of electricity.
Under the ZERL system the unit holds 3.5 cooling stars and 3.0 heating stars in the average climate zone. Hot zone cooling is rated at 4 stars, reflecting better relative performance during the warmer conditions typical of the Hunter Valley summer. Inverter operation means part-load efficiency — the condition during most overnight or shoulder-season use — will be better than the rated figures suggest, as the compressor runs at reduced speed rather than cycling off.
Installation Notes for the Fujitsu Comfort 4.2kW Reverse Cycle Split System
▾This system pairs the ASTH14KNCA indoor unit with the AOTH14KNCA outdoor unit.
Published installation details include maximum pipe length of 20m, maximum height difference of 15m, power supply: 240v_single_phase.
A site assessment should confirm unit placement, pipe route, drainage, electrical requirements and final room sizing before installation.
Warranty Information
▾This unit has a 5-year warranty, based on the warranty information recorded for this model.
5-year full parts and labour warranty.
Warranty coverage depends on correct installation, normal use, maintenance requirements and the manufacturer’s current warranty terms.
Frequently Asked Questions
▾Is the ASTH14KNCA suitable for a medium-sized bedroom?
Yes. At 4.2kW cooling with a 20 dB(A) quiet mode, it handles medium bedrooms comfortably and remains quiet enough for overnight use.
What is the heating performance in cold weather?
The unit operates down to -15 degrees Celsius outdoor temperature in heating mode, making it suitable for Hunter Valley winter nights. Efficiency decreases at lower temperatures, as reflected in the lower cold-zone star rating.
Does it include Wi-Fi?
No. Wi-Fi requires the optional UTY-NXT-BOX adaptor, which should be requested at installation time.
What is the warranty?
5-year full parts and labour warranty on all Fujitsu General domestic systems.
Will this unit work well with solar?
Yes. The rated cooling input of 1.23kW is well within the output of a standard 5kW solar system during daylight hours, making this a practical combination for daytime cooling in summer.
How long does installation typically take?
A standard back-to-back split system installation usually takes half a day. More complex runs -- long pipe routes or elevated positions -- will take longer. Your installer will advise at quoting stage.