General information only. Government programs change often — check the official source before you sign.
What is a multi-head system?
A multi-head (or multi-split) system connects one outdoor unit to several indoor wall units — for example three or four bedrooms and a living area. Each room has its own head and remote, so you can run only the rooms you need.
What is a ducted system?
A ducted system has one indoor unit (usually in the roof space or under the floor) that delivers air through ducts to vents in each room. Zoning lets you choose which areas are heated or cooled.
Side-by-side comparison
| Multi-head split | Ducted | |
|---|---|---|
| Look | Visible wall units in each room | Discreet ceiling or floor vents |
| Upfront cost | Often lower for a few rooms | Usually higher, especially for large homes |
| Running cost | Efficient when only some rooms are used | Efficient with good zoning and ducts |
| Installation | Simpler, no ducts | Needs roof or underfloor space |
| Redundancy | One outdoor unit — if it fails, all heads stop | One system — same consideration |
What about separate split systems?
Several individual split systems (each with its own outdoor unit) can be more efficient and resilient than one multi-head, but need more outdoor space. Ask installers to quote both if you’re unsure.
Incentives
There are no federal STCs for air conditioning. State programs such as Victorian Energy Upgrades and the NSW Energy Savings Scheme may support efficient reverse-cycle systems, and the ACT has offered zero-interest loans. Whether a multi-head or ducted system qualifies depends on the program rules, the product and what it replaces. See our post on air conditioning rebates.
Which should you choose?
A multi-head often suits apartments and homes where you want to condition a few rooms without ducts. Ducted suits larger homes where you want a whole-of-home solution with hidden vents. Get quotes for both if your home suits either.
Sources
- Victorian Government — Victorian Energy Upgrades
- NSW Energy Sustainability Schemes (ESS and PDRS)
- Energy Rating — appliance energy labels
Frequently asked questions
Is a multi-head system cheaper than ducted?
For a few rooms, often yes. For a large home, ducted can be better value per room. Compare quotes for your home.
Do multi-head systems qualify for rebates?
Some state programs support efficient reverse-cycle systems. Eligibility depends on the program rules and the product.