Multi head split systems
Multiair System: Reverse Cycle Multi Head Air Conditioning Gold Coast
Several rooms, one outdoor unit.
A multiair system, also called a multi head or multi split system, runs two or more indoor units from a single outdoor unit. Frost Solutions designs, installs and services them for homes and businesses across the Gold Coast, Logan and the Northern Rivers.
5.0 from 292 Google reviews
Multi split systems
What is a multiair system?
A multiair system is a reverse cycle air conditioner with one outdoor unit and two or more indoor units, each in its own room with its own controller. It works like several split systems sharing one outdoor unit, so you heat and cool several rooms without a row of outdoor units down the side of the house.
Frost Solutions supplies a range of multi split systems for homes in the Gold Coast, Logan and the Northern Rivers. We offer the full service:
- Multi split systems from the brands we supply, quoted to suit your rooms and budget
- A design and installation service, with indoor units sized room by room
- Repair and maintenance services for multi split systems
Indoor unit types
What types of multi head split system are there?
Multi head systems can mix three main styles of indoor unit: wall-mounted units for most rooms, bulkhead units hidden in a ceiling bulkhead, and floor-standing consoles. You can choose a different style for each room on the same outdoor unit, as long as the models are compatible.
Wall-mounted multi split units
The most common choice, and what you see in most apartments. A slim unit high on the wall of each room. Where there is wall space, they are the most cost-effective way to heat and cool individual rooms.
Bulkhead multi split units
A slim ducted unit hidden in a ceiling bulkhead or a low roof void, with only a grille showing. A good option for heating and cooling several rooms when there is not enough roof space for full ducted air conditioning.
Floor-standing multi split units
A low console that sits on the floor or is semi-recessed into a wall. Ideal where wall space up high is hard to find, such as rooms with large windows or raked ceilings, and good for heating because warm air starts low.
More detail on hidden units is on our bulk head AC units page, and on single-room systems on our split system air conditioning page.
Benefits
What are the benefits of a multiair system?
A multiair system suits rooms of any size because each indoor unit is sized separately. It runs efficiently, because inverter technology and per-room control mean you only condition the rooms in use, and it is reverse cycle, so the same system heats in winter and cools in summer.
Suits all room sizes
Each room gets an indoor unit of the right size and style, so a small study and a large living area can share one outdoor unit. You control each room separately, and the flexible unit options make installs in awkward rooms possible.
Energy and cost efficiency
Inverter compressors adjust their speed to match the load, and you only run the rooms you are using. Compare models on the Energy Rating Label: more stars means lower running costs for the same output.
Reverse cycle heating and cooling
Multi split systems are reverse cycle, so they heat as well as cool. On mild Gold Coast winter mornings, reverse cycle is an efficient way to take the chill off without a separate heater.
Is it right for you
When is a multi head system the right choice?
A multi head system is the right choice when you want to heat and cool several rooms but cannot fit ducted air conditioning, or when there is only room for one outdoor unit. Units, townhouses, homes with flat or tight roofs and two-storey homes where ducts cannot reach the upper floor are typical examples.
It is less suited to a house where you want every room conditioned and there is roof space available, where ducted usually gives a cleaner, quieter result. It is also worth weighing that every room on one outdoor unit depends on it: if it needs a repair, all those rooms are affected until it is fixed. Separate split systems avoid that, at the cost of more outdoor units.
What we check before recommending one
- Which rooms you want to heat and cool, and their sizes
- Where one outdoor unit can sit, with airflow and service access
- Pipe routes from the outdoor unit to each indoor unit
- Wall, ceiling and floor space in each room for the indoor unit style
- Switchboard capacity for the new circuit
- Whether ducted or separate splits would serve you better
Room by room
Which indoor unit suits which room?
Wall-mounted units suit most bedrooms and living areas. Bulkhead units suit rooms where you want nothing on the wall, such as a media room or main bedroom, if there is a bulkhead or ceiling void. Floor consoles suit rooms with big windows, raked ceilings or no high wall, and are good for heating.
| Room | Common choice | Why |
|---|---|---|
| Bedrooms | Wall-mounted | Simple, quiet night modes, lowest cost per room |
| Open-plan living | Wall-mounted or bulkhead | A larger unit placed to throw air down the length of the room |
| Media room or study | Bulkhead | Hidden unit, clear walls for screens and shelving |
| Rooms with large windows | Floor console | Fits under a window where there is no high wall |
| Raked ceilings | Floor console or wall-mounted | No ceiling void needed |
The total capacity of the indoor units has to suit the outdoor unit, and the pipe run to each room has limits, so we plan the whole layout together rather than room by room in isolation. If a room is a long way from the others, a separate split system for that room can be the simpler answer.
Installation
How is a multi split system installed?
We confirm the indoor unit positions with you, mount the outdoor unit, run insulated refrigerant pipes, drains and cables to each indoor unit, then our electricians connect the circuit. We pressure test, evacuate and charge the system, commission each room, show you the controls and clean up.
Every install is done by our own licensed technicians and electricians, with no subcontractors, and is backed by a 10-year workmanship guarantee. For later care, we offer air conditioning maintenance and repairs. To talk through a multi split for your home, call 1300 101 100 or get a free quote.
Multi split questions
Frequently asked questions
How many indoor units can run off one outdoor unit?
It depends on the outdoor unit model. Multi split outdoor units are made to run a set range of indoor units, commonly two to five, and the total indoor capacity has to fit within what the outdoor unit can supply. We match the indoor units to your rooms and choose an outdoor unit to suit.
Can different rooms be set to different temperatures?
Yes. Each indoor unit has its own controller and temperature setting. The one rule is that all indoor units on one outdoor unit need to run in the same mode at once, all cooling or all heating, which is rarely an issue in a home.
Is a multi-head system cheaper than separate split systems?
Not always. A multi split can cost a similar amount to the same number of separate splits, and if the outdoor unit fails, every room connected to it is affected. Its main advantages are one outdoor unit instead of several, and longer pipe runs. We price both options so you can compare.
Is multi split or ducted better for my home?
If you have usable roof space and want most of the house conditioned, ducted air conditioning usually gives a cleaner result. Multi split suits homes without roof space, such as units, townhouses and flat-roofed or two-storey homes where ducts cannot reach, or when you only need a few rooms.
What warranty comes with a multi split system?
Our 10-year workmanship guarantee covers the gas charge and call-outs, pipework is covered for 10 years, and units carry 5 years parts and labour (Hisense 5+2 years). Warranties apply once the job is paid in full. Warranty details.
Keep exploring
Related services and guides
Split systems
One indoor unit, one outdoor unit, one room.
Learn moreBulkhead units
Hidden units for rooms without roof space for ducted.
Learn moreDucted air conditioning
Whole-home comfort from one system in the roof.
Learn moreAir conditioning installation
Learn moreAir conditioning maintenance
Learn moreAir conditioning repairs
Learn moreNorthern Rivers service area
Learn moreEnergy-efficient cooling solutions for homes
Learn moreReal words from real clients
Rated 5.0 from 292 Google reviews
Every review below is from our Google Business Profile. Read them all on Google.
5.0 from 292 Google reviews checked 13 Nov 2026- ★★★★★
From my initial phone call to the pre-check and installation, all correspondence and actions were clear and understandable (for someone who is non tech savvy).. Shout out to Paul (Senior Technician) ... He was also clear when showing me how to use the air-con, and info on future servicing and cleaning when needed. Thanks Frost Solutions Team, I highly recommend you to anyone needing a new aircon :)
Sue Google review, about Jun 2026
- ★★★★★
Wow! Frost Solutions is possibly the best all round company I've worked with for a long time. The admin staff, sales and tradesmen-installers were all very polite, efficient and easy to communicate with. From the time I phoned to organise a quote to the full install was only an about a week ...
Jo Google review, about Nov 2025
- ★★★★★
Incredible service from start to finish! ... We had some extenuating circumstances that caused a number of delays at our end, and a significantly sloping site, but the crew from Frost were super accommodating, kept in touch but we're never pushy to get "the sale". ... We would highly recommend Frost.
Kelly Google review, about Jan 2026
- ★★★★★
Thank you Frost Solutions. Liam and Henry arrived before the booked time, a very good first impression. Both lads did a very professional job installing our Air con. The wife and I most definitely recommend the superb service of Frost Solutions.
Ian Google review, about Sep 2026
Your comfort, our priority.
Cooling several rooms?
Tell us which rooms you want to heat and cool and where an outdoor unit could go. We will design the system and quote it.