Hitachi airHome 400 3.5kW Inverter Wall Mounted Split System
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Offering an ideal balance of power and efficiency, the Hitachi airHome 400 3.5kW inverter wall-mounted split air conditioner provides 12,000 BTU of cooling alongside rapid winter heating for medium-sized spaces up to 35m². Perfectly suited to open-plan UK living spaces, master bedrooms, and busy retail shops, this system integrates Hitachi's proprietary FrostWash technology to remove up to 99% of bacteria and mould from the heat exchanger coils automatically. Built-in Wi-Fi enables swift pairing with the intuitive airCloud Go app, giving you scheduling tools, real-time energy tracking, and voice-assisted temperature controls via Amazon Alexa and Google Assistant. Equipped with low-GWP R32 refrigerant and variable-speed DC inverter technology, it achieves high seasonal efficiency ratings of A++ in cooling and A+ in heating. Compact dimensions and ultra-quiet airflow ensure discreet year-round indoor comfort without disturbing family life or work.
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Smart-home ready
Connects natively with the systems below — control by app or voice.
- Free UK mainland delivery on in-stock units
- Manufacturer warranty included
- 14-day returns
Specifications
Description
Offering an ideal balance of power and efficiency, the Hitachi airHome 400 3.5kW inverter wall-mounted split air conditioner provides 12,000 BTU of cooling alongside rapid winter heating for medium-sized spaces up to 35m². Perfectly suited to open-plan UK living spaces, master bedrooms, and busy retail shops, this system integrates Hitachi's proprietary FrostWash technology to remove up to 99% of bacteria and mould from the heat exchanger coils automatically. Built-in Wi-Fi enables swift pairing with the intuitive airCloud Go app, giving you scheduling tools, real-time energy tracking, and voice-assisted temperature controls via Amazon Alexa and Google Assistant. Equipped with low-GWP R32 refrigerant and variable-speed DC inverter technology, it achieves high seasonal efficiency ratings of A++ in cooling and A+ in heating. Compact dimensions and ultra-quiet airflow ensure discreet year-round indoor comfort without disturbing family life or work.
Winter heating cost: this AC vs electric heaters
This unit reverses to heat your room in winter. Based on its 4 kW heat output used 5 hrs/day over a 150-day UK heating season at £0.27/kWh.
Electric heater / season
£849
This AC / season
£283
You save / season
£566
~67% less electricity
| Heating method | Electricity / season | Cost / season | Efficiency | Summer cooling |
|---|---|---|---|---|
| This heat-pump AC | 1048 kWh | £283 | Up to 300% | |
| Plug-in electric heater | 3143 kWh | £849 | 100% | |
| Electric storage heater | 3143 kWh | £849 | 100% |
Heat output estimated from this unit's 14,300 BTU/hr rating. A heat pump moves heat (COP ≈ 3), so it uses about a third of the electricity of a direct-electric heater for the same warmth. Actual savings vary with room size, insulation, tariff and usage. See the full comparison →