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  1. Home
  2. /Air Conditioning
  3. /Multi Split Air Conditioners

Multi Split Air Conditioners

The Rinnai Inverter Multi Split Air Conditioning systems delivers flexible, energy-efficient heating and cooling for multiple rooms, connecting several indoor units to a single outdoor unit for year-round comfort and space-saving installation.

Rinnai Ducted Air Conditioning - 15 / 18kW Outdoor Twin Fan Unit

Multi Split Outdoor Units

  • Up to six rooms with one outdoor unit
  • Wall-mounted or floor-standing options
  • Dual air outlets
  • Quiet operation
  • Wi-Fi control enabled
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Rinnai PX Series Inverter Split Air Conditioner (front)

Wall Mount

  • Up to six rooms with one outdoor unit
  • ECO+ energy savings for best operating mode
  • Next-Gen Turbo+ for rapid comfort on demand
  • Quiet operation
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Rinnai Slim Ducted Air Conditioning - keeping you comfortable without taking up space

Slim Ducted

  • Up to six rooms with one outdoor unit
  • Indoor unit can be hidden in a ceiling
  • Non-obtrusive to your architectural designs
  • Quiet operation
  • Wi-Fi control enabled
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Rinnai Slim Ducted Air Conditioning - keeping you comfortable without taking up space

Ducted

  • Up to six rooms with one outdoor unit
  • Indoor unit can be hidden in a ceiling
  • Non-obtrusive to your architectural designs
  • Quiet operation
  • Wi-Fi control enabled
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Rinnai Multi Split Compact Cassette Air Conditioner (under)

Compact Cassette

  • Up to six rooms with one outdoor unit
  • Indoor unit can be hidden in a ceiling
  • Non-obtrusive to your architectural designs
  • Quiet operation
  • Wi-Fi control enabled
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Rinnai Floor Console Inverter Split System (front)

Floor Console 5.0kW

  • Up to six rooms with one outdoor unit
  • Wall-mounted or floor-standing options
  • Dual air outlets
  • Quiet operation
  • Wi-Fi control enabled
View product

Multi Split Air Conditioners

Industry-leading multi-room climate control and comfort

The Rinnai Multi Split Air Conditioning range delivers flexible, room-by-room climate control through advanced multi-zone technology, allowing multiple indoor units to connect to a single outdoor system while providing reliable comfort throughout homes of all sizes.

Reliable performance with tailored climate control

The Rinnai Multi Split Air Conditioning range provides tailored heating and cooling across multiple rooms from a single outdoor unit, delivering reliable comfort throughout the home. Advanced climate control, energy-efficient operation, flexible installation options, and independent zoning combine to deliver convenient comfort and everyday efficiency.

Personalised comfort with independent room control

  • Personalised room-by-room comfort

    Set individual temperatures across connected indoor units
  • Consistent performance, every day

    Reliable heating and cooling throughout the home
  • Efficient whole-home operation

    Enjoy comfort where it's needed while helping optimise energy use

FAQs

Benefits

  • Allows multiple indoor units to connect to a single outdoor unit

  • Provides individual temperature control in different rooms

  • Saves outdoor space compared to installing multiple split systems

  • Offers both heating and cooling in one system

  • Energy efficient when only conditioning occupied rooms

Considerations

  • Higher upfront cost than a single split system

  • Installation is more complex and requires professional design and installation

  • Indoor unit capacity is limited by the connected outdoor unit

  • If the outdoor unit requires servicing, multiple rooms may be affected

  • Best suited to homes requiring climate control in several rooms

A Multi Split system allows multiple indoor units (usually 2–5 rooms) to be connected to one outdoor unit.

This means you can heat or cool several rooms without needing multiple outdoor units outside your home.

Sizing is based on:

  • Room sizes

  • Number of indoor units

  • How many rooms will run at the same time

Outdoor units are usually sized at less than the total of all indoor units, assuming not all rooms are used at once. Correct sizing is critical for comfort and efficiency.

A Multi Split system is ideal if:

  • You want to condition several rooms

  • There’s limited space for outdoor units

  • Body corporate or council rules restrict outdoor units

  • You want a neater exterior appearance

They can be very efficient when:

  • Only a few rooms are running

  • Inverter technology is used

However, if all rooms run constantly, multiple single splits may be more efficient.

With proper installation and maintenance:

  • 10–15 years is typical

Regular servicing is especially important due to system complexity.

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