The short answer comes down to how much of your home you need to heat and cool. A split system is usually the better fit if you want to cool one or two rooms for a lower upfront cost, while a ducted reverse cycle system suits whole-home comfort across many rooms, at a higher price to install. At QuickAir, we’ve installed and serviced heating and cooling in more than 20,000 Australian homes, and the honest truth is that neither system is “better” on its own. The right one depends on your home, your budget, and the rooms you actually live in.
This guide compares the two on the things that matter: what they cost to install, what they cost to run, how each one heats and cools, and how much of your home each is built for. We’ve kept it practical, so you can work out which way to lean before you ever book a quote.
What is a ducted reverse cycle system?
A ducted reverse cycle system heats and cools your whole home from a single unit, usually tucked away in the roof. That unit pushes warm or cool air through a network of ducts and out through discreet vents in each room. “Reverse cycle” means it works both ways, cooling in summer and heating in winter, so you don’t need a separate heater.
The appeal is that it’s close to invisible. Only the vents show, the compressor sits outside, and you get consistent temperatures across multiple rooms and levels. It’s the most seamless way to keep an entire home comfortable, which is why we install ducted reverse cycle systems most often in larger homes or new builds where whole-home comfort is the goal.
What is a split system?
A split system pairs one indoor head unit, usually mounted on a wall, with an outdoor compressor. The two are joined by a refrigerant line, and the indoor unit can sit up to 15 metres from the compressor outside, according to the Australian Government’s YourHome guide. Each indoor unit heats and cools the room it’s in, with the temperature control right where you set it.
Almost all modern split systems are reverse cycle, so the one unit cools in summer and heats in winter. It’s the most popular way to condition the rooms Australians actually use, because it installs fast, costs less per unit, and gives you precise control room by room. A multi-head split takes this further, running two to five indoor units from a single outdoor compressor. If you only need to sort out a bedroom, a study, or a living area, a split system is usually where we point people first.
Ducted vs split system: a side-by-side comparison
Both systems can be reverse cycle, and both can keep a room at the temperature you want. The differences show up in coverage, cost, installation, and how discreet the system is. Here’s how they compare across the factors that decide most jobs.
| Factor | Ducted reverse cycle | Split system |
| Coverage | Whole home from one unit, consistent temperature across rooms | One room or zone per indoor unit; multi-split runs 2 to 5 rooms |
| Upfront cost | Higher. Whole-home installs typically $12,000 to $25,000+ | Lower per unit. A single room starts around $1,500 to $5,000 |
| Installation | More involved. Runs ducts through the roof or floor; longer install | Faster. One indoor head and an outdoor unit, no ductwork |
| Running efficiency | Slightly lower per unit; some energy is lost through the ducts | Higher per unit; no duct losses, and you only run the rooms you use |
| Control and zoning | One system, often zoned to switch areas on or off | Independent control in every room with its own unit |
| Appearance | Hidden in the roof, only vents visible, very low visual impact | Indoor units visible on the wall in each room |
| Best suited to | Larger homes, many rooms, whole-home comfort | One or a few rooms, lower upfront budget, room-by-room comfort |
The pattern is consistent. Ducted wins on whole-home comfort and a clean look. Split wins on upfront cost, install speed, and running only the rooms you’re in.
How much do ducted and split systems cost to install?
Installation cost is the biggest single difference between the two, and it’s usually the deciding factor. A single split system is the cheapest way into reverse cycle comfort. A ducted system costs considerably more upfront because of the unit size and the ductwork involved.
The ranges below reflect what we see across the installs we quote in 2026. Your actual price depends on the size of the system, the layout of your home, and how easy the roof or wall access is.
| System type | Typical installed cost (AUD) |
| Single-room split system | $1,500 to $5,000 |
| Multi-head split (2 to 5 rooms) | $2,500 to $8,000 |
| Ducted whole-home system | $12,000 to $25,000+ |
A few things move these numbers. Multi-head splits let one outdoor unit serve several rooms, which can work out more economical than separate units if you’re cooling three or four spaces. Ducted pricing climbs with the number of zones, the length of the duct runs, and whether it’s a retrofit into an existing home or part of a new build. Retrofitting ducts into a finished house with tight roof space is the job most likely to push a ducted quote toward the top of the range.
Because the right number depends entirely on your home, we give a fixed written quote after seeing the space, so you know the cost before any work starts. There are no call-out fees, and the price you see is the price you pay. An on-site installation quote is $149, and that fee is credited back to you if you go ahead with the install. Interest-free finance is available on new systems.
Which is more energy efficient to run?
Split systems are generally more efficient per unit than ducted systems. The reason is simple: ducted air travels through a network of ducts, and some heating and cooling is lost along the way. As the Australian Government’s energy site notes, ducted systems are not as efficient as wall units because a larger fan is used and energy is lost through the ductwork.
That efficiency gap matters because heating and cooling is the largest energy user in most homes. It accounts for around 40% of household energy use, more than appliances, water heating, or lighting. Reverse cycle systems are still the most efficient way to heat and cool, delivering roughly three to six units of heating or cooling for every unit of electricity they draw. A split system with inverter technology can run about 30% more efficiently than an older fixed-speed model.
Ducted systems can close the gap with two things: good duct insulation and zoning. Zoning lets you switch off the rooms you aren’t using, so you’re not paying to condition an empty house. The same energy advice is worth applying to whichever system you choose. Each extra degree of heating or cooling raises energy use by around 5 to 10%, so the recommended settings are 18 to 20°C in winter and 25 to 27°C in summer.
The efficiency of either system also drifts over time as filters clog and refrigerant performance changes. That’s why we recommend regular servicing to keep whichever system you have running at the efficiency it was built for.
When a split system is the right choice
A split system is usually the better call when you’re cooling a defined space rather than the whole house. In the homes we work in, it’s the right fit when:
- You only need to heat and cool one or two rooms, like a bedroom, study, or living area.
- Upfront budget matters and you want the lowest cost into reverse cycle comfort.
- You want to add cooling one room at a time, rather than all at once.
- Your home has no existing ductwork and you’d rather avoid the disruption of installing it.
- You want independent control, so each room runs on its own schedule or switches off entirely.
A split system is also the faster install. There’s no ducting to run, so a single unit is often in and working within a day.
When a ducted system is the right choice
A ducted reverse cycle system earns its higher price when comfort across the whole home is the priority. It tends to be the right choice when:
- You want consistent temperatures across many rooms or multiple levels.
- You have a larger home where several split units would be needed to cover it.
- The clean look matters to you, with only vents visible instead of units on every wall.
- You’re building or renovating, so running ducts is straightforward while the roof or walls are open.
- You want one system and one control point for the whole house, ideally zoned to save energy.
A well-designed ducted system with zoning gives you whole-home comfort that a collection of individual splits can’t match for evenness, which is often what tips a larger home toward ducted despite the cost.
Can you use both in the same home?
Yes, and plenty of homes do. A common approach is a ducted system for the main living areas and bedrooms, with a separate split system in a space that runs on a different schedule, like a home office, a granny flat, or a room that was added after the original build. Mixing the two lets you match each part of the house to how it’s actually used, rather than forcing one system to do everything.
How to decide between ducted and split
Work through four questions and the answer usually becomes clear:
- How many rooms? One or two points to split. Most of the house points to ducted.
- What’s your upfront budget? A tighter budget favours a split or multi-split. Room for a larger spend opens up ducted.
- New build or existing home? Building or renovating makes ducted easy to run. A finished home with tight roof space makes split simpler and cheaper.
- How much does the look matter? If you’d rather not see a unit on the wall in every room, ducted keeps everything hidden.
If you’re still unsure after that, the most reliable answer comes from having someone look at your actual home. When our technicians quote a job, they work through the layout, the number of rooms you want to cover, insulation and sun, where the indoor and outdoor units can go, and how you’ll use the system day to day. That assessment is what turns a rough lean into the right system for your home.
Frequently asked questions
Is ducted or split cheaper to run?
A split system is generally cheaper to run per unit, because there are no ducts to lose energy through and you only condition the rooms you’re using. A ducted system can be efficient when it’s well insulated and zoned, but running the whole home will still use more energy than cooling a single room with a split.
How much does ducted air conditioning cost in Australia?
A ducted whole-home reverse cycle system typically costs between $12,000 and $25,000 or more to install, depending on the size of your home, the number of zones, and the duct runs involved. The final price depends on your specific home, which is why an on-site quote is the accurate way to price it.
Can one split system cool a whole house?
Not well. A single split cools the room it’s in, and one oversized unit rarely spreads air evenly through a whole house. To cool a whole home with splits you’d need several units, or a multi-head split running two to five rooms. For genuine whole-home comfort, a ducted system is usually the better fit.
Is ducted air conditioning worth it?
For a larger home where you want even temperatures across many rooms and a clean, hidden look, ducted is often worth the higher upfront cost. For one or two rooms, the extra spend is hard to justify, and a split system delivers the same comfort where you need it for far less.
How long does each system take to install?
A single split system is often installed in a day, since there’s no ductwork. A ducted system takes longer, usually a few days, because the ducts, vents, and central unit all need to be fitted, and a retrofit into an existing home adds time.
Does a split system heat as well as cool?
Almost all modern split systems are reverse cycle, so the one unit cools in summer and heats in winter. Reverse cycle heating is one of the most efficient ways to warm a room, which is part of why splits are such a popular all-year choice.
Get the right system for your home
Choosing between ducted and split comes down to your home, your budget, and how many rooms you want to keep comfortable. Once you’ve worked out which way you’re leaning, the next step is a fixed quote for your actual space, so you know the cost before anything is committed. Our licensed technicians install and service both systems across every capital city, and we can usually get someone out to quote same day or the next morning. An on-site installation quote is a fixed $149, credited back if you go ahead. Book a quote or call us on 1300 730 896.
