Ducted air-conditioning vs single split systems: which is better?
Neither is better for every home. Ducted systems cool and heat many rooms from one hidden unit with zoning, so they suit whole homes. Split systems cool one room each with no ducts, so they suit single rooms and smaller spaces. The right answer depends on how many rooms you need and how you use them.
It is one of the most common questions homeowners ask. Below we compare the two on coverage, appearance, noise, zoning, energy efficiency and cost, and smart control, so you can decide what suits your home.
| Ducted | Single split systems | |
|---|---|---|
| Coverage | Whole home or large areas | One room or open-plan area per unit |
| Appearance | Ceiling outlets only | Indoor unit on each wall |
| Indoor noise | Very low; fan is in the roof | Low; fan is in the room |
| Control | Zones, or each zone’s temperature with AirTouch 5 | Each unit controlled separately |
| Upfront cost | Higher | Lower per room |
| Running cost | Efficient when zoned; some duct losses | Very efficient for single rooms |
| Needs | Roof space, one outdoor unit | Wall space, one outdoor unit per split |
1. Which gives more complete climate control?
Ducted. One system delivers air through ducts to every room on it, so temperatures are consistent across bedrooms, living areas and hallways. A single split system is limited to the room or open area it is in; to match ducted coverage, you need several splits.
Ducted suits family homes, two-storey houses and offices where many rooms need to be comfortable. Split systems suit apartments, single rooms, extensions and granny flats. For several rooms without ducts, a multi-head system sits between the two.
2. Which looks better and saves more space?
Ducted. The indoor unit and ducts are hidden in the roof space, leaving only slim ceiling outlets and a return-air grille. Split systems need an indoor unit on the wall of each room, which affects furniture placement and the look of the room, though modern units are much slimmer than older ones.
3. Which is quieter?
Inside the home, ducted is usually quieter because the fan unit is in the roof and you only hear airflow at the outlets. Modern split systems are also quiet, especially on low fan speeds, but the fan is in the room with you, which some people notice at night.
For bedrooms, both can work well. With either type, outdoor unit placement matters for your sleep and your neighbours, and we plan it at the quote.
4. Which offers better zoning and control?
Both give room-level control in different ways. Ducted systems use zones that you switch on and off, and with AirTouch 5 each zone can hold its own temperature. Split systems are naturally zoned, because each unit runs independently with its own remote or app.
Ducted zoning means you can cool bedrooms at night and living areas by day without paying to cool empty rooms. With splits, you simply run the ones you need.
5. Which is more energy efficient and economical?
For one or two rooms, split systems are usually cheaper to buy and run, with no duct losses. For most of a house, a well-designed, zoned inverter ducted system can be economical and compares well with running several splits, while giving better coverage. Upfront, ducted costs more.
Efficiency depends on correct sizing, a good star rating on the Australian energy label (for splits), sealed and insulated ducts (for ducted), and sensible settings. See maximising energy efficiency. If you want to spread the cost, see finance.
6. Which works better with smart home technology?
Both can be controlled from your phone. Ducted systems use a smart zone controller such as AirTouch 5, giving one app for the whole house. Split systems use the manufacturer’s Wi-Fi module, usually one app with each unit listed separately. Voice assistant support varies by brand and model.
Read the benefits of smart thermostats and our home automation page for upgrade options.
What is the bottom line?
Ducted air conditioning gives complete, discreet, quiet whole-home comfort with flexible zoning, and suits larger homes and families. Single split systems give efficient, affordable comfort room by room. Many homes use both. If you are not sure, book a free quote; we can price both options for your home.