Hitachi
airHome 400 RAK-DJ35RHAE / RAC-DJ35WHAE
The Hitachi airHome 400 is a quiet, balanced R32 inverter split with dual A++ ratings, built-in Wi-Fi and FrostWash self-cleaning, offering proven Japanese-brand reliability at a competitive mid-market price.
€610
List priceTypical EU online price for the airHome 400 12000 BTU set
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Performance
- Cooling capacity
- 3.5 kW · 12,000 BTU
- Heating capacity
- 4.2 kW
- Room coverage
- 25–35 m²
- SEER (cooling)
- 7.5
- SCOP (heating)
- 4.6
- Energy class (cooling)
- A++
- Energy class (heating)
- A++
- Annual energy (cooling)
- Not published
Noise, size & features
- Model number
- RAK-DJ35RHAE / RAC-DJ35WHAE
What is good
- Very quiet indoor operation from around 20 dB(A)
- A++ in both cooling and heating with SCOP 4.6
- Built-in Wi-Fi and FrostWash self-cleaning
- Strong 4.2 kW heating output for the size
What to watch
- Entry airHome 400 tier sits below Hitachi's premium ranges
- SEER of 7.5 is good but not the highest available
- Outdoor unit styling is utilitarian
Installation & the rules that apply
This is a single split. This is where regulation bites. Breaking into the refrigerant circuit must be done by an F-gas certified installer (in the EU and UK), and single-split systems may use refrigerant indefinitely only if its GWP is under 750 (R32 qualifies). DIY voids the warranty, home insurance and is an offence. The outdoor unit alters the facade, so a prior declaration to the town hall (e.g. France), planning permission, or freeholder, landlord and condominium consent is commonly needed, plus heritage rules in protected zones and minimum-distance and noise rules toward neighbours.
Certified installer
R32
Common questions about the Hitachi airHome 400 RAK-DJ35RHAE / RAC-DJ35WHAE
- How loud is the Hitachi airHome 400 RAK-DJ35RHAE / RAC-DJ35WHAE?
- 20 dB(A) indoors, quieter than a whisper.
- How energy-efficient is the Hitachi airHome 400 RAK-DJ35RHAE / RAC-DJ35WHAE?
- Its efficiency rating is SEER 7.5.
- What size room does the Hitachi airHome 400 RAK-DJ35RHAE / RAC-DJ35WHAE cool?
- It is rated to cool a room 25–35 m² (3.5 kW · 12,000 BTU).
- Do I need a professional to install the Hitachi airHome 400 RAK-DJ35RHAE / RAC-DJ35WHAE?
- Yes. As a single split it needs a certified installer. Usually needs permission.
- Does the Hitachi airHome 400 RAK-DJ35RHAE / RAC-DJ35WHAE heat as well as cool?
- Yes. It also heats, rated 4.2 kW.
Is a split even the right type?
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