Hitachi airHome 400
5
models on the register
Short answer
5 Hitachi airHome 400 models are registered for sale in Australia in 2026, from 2.5 to 7 kW. Supplied and installed, most land between $1,500 to $3,900; up to three licensed local installers will quote your actual job.
Prices are estimates, not quotes (how we estimate them). Rebate rules checked September 2026.
Compare 3 quotes for my houseairHome 400 is Hitachi's reverse cycle wall split from 2.5 to 7.0 kW. It suits everyday bedroom and living room use.
- Voice control with Alexa and Google Home
- FrostWash self-clean
- SafeGuard System
- ViroSense Z1 filter
- 0.5°C temperature control
At a glance
- Models5
- Installed, estimate$1,500–$3,900
- Quietest indoorsHitachi RAK-DJ25PHAT54 dB(A), 2.5 kW
- Most efficient (average zone)Hitachi RAK-DJ25PHAT5 cooling stars, 2.5 kW
- Reverse cycle100%heat and cool
- R32 refrigerant100%the current low-GWP standard
2.5 kW
1 models · installed $1,500–$2,500
| Model (outdoor / indoor) | Type | Cool kW | Heat kW | Cool stars | Heat stars | Indoor dB | Installed, estimate | Quote |
|---|---|---|---|---|---|---|---|---|
| RAC-DJ25PHAT/RAK-DJ25PHAT | Wall split | 2.5 | 3.2 | 5★ | 3.5★ | 54 | $1,500–$2,500 | Get quotes |
3.5 kW
1 models · installed $1,700–$2,700
| Model (outdoor / indoor) | Type | Cool kW | Heat kW | Cool stars | Heat stars | Indoor dB | Installed, estimate | Quote |
|---|---|---|---|---|---|---|---|---|
| RAC-DJ35PHAT/RAK-DJ35PHAT | Wall split | 3.5 | 4 | 4.5★ | 3★ | 57 | $1,700–$2,700 | Get quotes |
5.0 kW
1 models · installed $2,100–$3,300
| Model (outdoor / indoor) | Type | Cool kW | Heat kW | Cool stars | Heat stars | Indoor dB | Installed, estimate | Quote |
|---|---|---|---|---|---|---|---|---|
| RAC-DJ50PHAT/RAK-DJ50PHAT | Wall split | 5 | 5.3 | 3.5★ | 2.5★ | 61 | $2,100–$3,300 | Get quotes |
6.0 kW
1 models · installed $2,400–$3,600
| Model (outdoor / indoor) | Type | Cool kW | Heat kW | Cool stars | Heat stars | Indoor dB | Installed, estimate | Quote |
|---|---|---|---|---|---|---|---|---|
| RAC-DJ60PHAT/RAK-DJ60PHAT | Wall split | 6 | 7 | 3.5★ | 2.5★ | 62 | $2,400–$3,600 | Get quotes |
7.1 kW
1 models · installed $2,600–$3,900
| Model (outdoor / indoor) | Type | Cool kW | Heat kW | Cool stars | Heat stars | Indoor dB | Installed, estimate | Quote |
|---|---|---|---|---|---|---|---|---|
| RAC-DJ70PHAT/RAK-DJ70PHAT | Wall split | 7 | 8 | 3.5★ | 2.5★ | 63 | $2,600–$3,900 | Get quotes |
Every model on the Energy Rating register marked available in Australia. Stars are the zoned label for the average climate zone (average zone); indoor noise is the registered sound power level, measured the same way for every model. Installed prices are estimated 2026 supply-and-install ranges, not quotes (how we estimate them); your installer confirms the number. Browse and filter everything in the full catalogue.
FAQ
Hitachi airHome 400: common questions
How much does a Hitachi airHome 400 model cost installed?
Typically $1,500 to $3,900 supplied and installed in 2026, depending on size and the job. 2.5 kW: $1,500 to $2,500; 3.5 kW: $1,700 to $2,700; 5.0 kW: $2,100 to $3,300; 6.0 kW: $2,400 to $3,600. Pipe runs, a new circuit or a second storey add to it. Get up to three local quotes for your actual job.
Which is the quietest Hitachi airHome 400 models?
On the registered indoor sound level, the Hitachi RAK-DJ25PHAT (2.5 kW) is the quietest at 54 dB(A). Compare within the same size: bigger units are louder. See the quietest split systems ranking.
Which is the most energy efficient?
For the average climate zone, the Hitachi RAK-DJ25PHAT (2.5 kW) has the highest cooling rating here at 5 stars. Star ratings on the zoned label run to 10, and a star is worth more in a hot zone than a mild one. For cold-climate heating, the Hitachi RAK-DJ25PHAT leads at 3 stars.
What size split system do I need?
Roughly 2.5 kW for a bedroom, 3.5 kW for a large bedroom or small living room, and 5 to 7.1 kW for open-plan living. West glass and poor insulation push it up. Use the size calculator for your room.
Sources
Brand names and logos are trademarks of their owners, shown to identify the brands we compare. We are independent and not affiliated with any manufacturer.
Get quotes for your air con
Free and takes about two minutes. Check your rebate, then up to three licensed local installers quote the job.
Compare 3 quotes