4.2 kWFujitsu Comfort 4.2kW Split System
The 4.2 kW size of the Fujitsu Comfort Split cools a room of up to about 30 to 36 square metres as a guide. That is from Mitsubishi Heavy Industries' sizing chart for an insulated room: the larger figure if it faces north, the smaller if it faces east. We confirm sizing from your details and photos, or on a site visit, before quoting.
Part of the Fujitsu Comfort Split range, Fujitsu General's split system line, in 6 sizes. Running costs below use the Sydney median rate; the Eastern Suburbs and Western Sydney pages cost systems on their own network tariffs. Check the size against your rooms, compare it with other 4.2 kW options, or ask about supply and installation.
About $298 a year at the current Sydney median electricity rate: $111 of cooling plus $187 of heating, from the official GEMS test figures.
The Fujitsu Comfort 4.2kW uses 335 kWh per year for cooling and 564 kWh per year for heating under standard test conditions in Sydney's climate zone. These figures are from the official GEMS energy label. The system carries a 3.5-star cooling efficiency rating and a 3-star heating efficiency rating for Sydney.
Efficiency is measured by AEER for cooling at 3.41 and ACOP for heating at 4.15. The system uses R32 refrigerant. Your actual running costs will depend on how often you run the air conditioner and your local electricity rate.
Source: Australian GEMS registry · median of 170 Sydney residential tariffs, including GST · Refreshed monthly · Last updated October 2026
Specifications
From the manufacturer’s published range data. We confirm the exact configuration when we quote.
About the Fujitsu Comfort Split range| Brand | Fujitsu General |
|---|---|
| Model | ASTH14KNCA |
| Series | Fujitsu Comfort Split |
| System type | Split System |
| Capacity | 4.2 kW |
| Refrigerant | R32 |
| Warranty | 5 year parts & labour |
Other 4.2kW options
All split systems
Panasonic RZ 4.2kW
Model CS-RZ42XKR / CU-RZ42XKR. Value series, R32
Mitsubishi Electric MFZ-KW 4.2kW
Model MFZ-KW42VGK-A1. Floor mounted, Built-in Wi-Fi
Mitsubishi Electric MSZ-EF 4.2kW
Model MSZ-EF42VG. Three colours, Below 21dB