Ducted vs Split System Air Conditioning: Which Is Right for Your Home?

Choosing between ducted and split system air conditioning comes down to how many rooms you want to cool and how much you want to spend upfront. Split systems are cheaper to buy and install, and they cool one or two rooms at a time. Ducted systems cost more upfront but cool your whole home evenly through hidden ceiling vents. Neither is 'better' overall — the right one depends on your home, your budget and how you actually live in the space.

What's the difference between ducted and split system air conditioning?

A split system has two parts: an indoor head unit mounted on a wall inside, and an outdoor compressor. One indoor unit heats and cools one space. A multi-head split runs several indoor units off a single outdoor unit, so you can cover a few rooms.

A ducted system hides a single large unit in your roof space. It pushes conditioned air through a network of ducts to discreet vents in each room, controlled from a central touchpad. Most modern systems on both sides are reverse cycle, which means they heat in winter and cool in summer from the one unit.

Simple rule of thumb: cooling one or two rooms? A split system usually wins. Cooling the whole house evenly? Ducted usually wins.

When does a split system make more sense?

Split systems suit smaller homes, apartments, and anyone who only needs to cool the rooms they spend the most time in — a living area, a main bedroom, a home office. They are the practical, budget-friendly choice for a lot of Australian households.

• Lower upfront cost — a single unit is the cheapest way to get reverse cycle comfort
• Faster, less invasive install — often done in a few hours with no roof ductwork
• Room-by-room control — only run the units in rooms you're using
• Easy to add to over time — start with one room, add more later

The trade-off is the look and the coverage. You get a visible unit on the wall in each room, and cooling the whole house means several units rather than one seamless system.

When is ducted air conditioning worth it?

Ducted comes into its own in larger homes and open-plan layouts where you want consistent comfort everywhere, without a head unit on every wall. On a 40-degree Adelaide afternoon, a well-sized ducted system keeps the whole house at one temperature.

• Whole-home comfort — even temperatures across every room
• Clean look — only slim vents are visible, the unit is hidden in the roof
• Zoning — split the home into zones so you only condition the areas in use
• Often adds more appeal at resale than wall-mounted units

The trade-offs are a higher upfront cost, a bigger install job, and the need for enough roof space to run the ducts. It's a bigger commitment, but for the right home it's the more comfortable long-term answer.

How do the running costs compare?

Running cost depends more on how you use the system than on ducted versus split. A split system cooling one room is cheap to run because you're only conditioning that space. A ducted system cooling the whole home naturally uses more energy — but a zoned ducted system that only runs the living areas during the day can be surprisingly efficient.

Both types are reverse cycle, which is one of the most efficient ways to heat and cool a home. The single biggest lever on your bill is pairing either system with solar, so you cool your home on daytime energy you generate yourself. A battery takes it further by storing that solar to run the aircon into the evening — see our home battery page for how that works.

How much does each cost to install?

As a general guide, a single split system typically lands somewhere from a couple of thousand dollars to around five thousand installed, depending on capacity and brand. Multi-head splits sit higher again. A ducted reverse cycle system for a whole home is a bigger investment, usually well into five figures, because of the unit size, ductwork and install labour.

These are broad ranges only — the real number depends on your home's size, layout, roof access, the number of rooms and zones, and the brand you choose. The only way to know your price is a proper on-site assessment. For payment and finance options, and any current incentives, see rebates and finance — we keep that page up to date because these things change over time and vary by state.

Which is better for an Adelaide home?

Adelaide's climate swings hard — hot, dry summers and cold winter nights — so reverse cycle makes sense either way. For a compact home or a unit where you mainly live in one or two rooms, a split system is the smart, cost-effective pick. For a larger family home where you want every room comfortable through a heatwave, ducted is usually worth the extra. If you're weighing it up, our Adelaide air conditioning team can look at your actual floorplan and tell you straight which way to go.

How do I choose the right system?

Work backwards from three questions: How many rooms do I need to cool? What's my upfront budget? Do I want it invisible or am I fine with wall units? Answer those honestly and the choice usually makes itself. Then get the sizing right — an undersized unit struggles on the worst days, and an oversized one wastes money. A good installer measures your rooms, checks insulation and orientation, and matches the capacity to your home rather than guessing. Browse our air conditioning options or get a tailored recommendation below.

Frequently asked questions

Is ducted or split system air conditioning cheaper?

A split system is cheaper to buy and install, especially for one or two rooms. Ducted air conditioning costs more upfront because it conditions the whole home through a single hidden unit and ductwork. Over the long term the gap narrows if you'd otherwise install several splits to cover a large home.

Can I cool my whole house with split systems instead of ducted?

Yes. Multi-head split systems run several indoor units off one outdoor unit, so you can cover multiple rooms. It can work out cost-effective for a few key rooms, but it means a head unit on each wall and separate controls, whereas ducted gives one seamless, centrally controlled system.

Is reverse cycle air conditioning good for both heating and cooling?

Yes. Reverse cycle systems heat in winter and cool in summer from the same unit, and they're among the most efficient electric heating options available. Both split and ducted systems are commonly reverse cycle, so you get year-round comfort either way.

Does running air conditioning on solar save money?

It can make a big difference. Air conditioning is a large daytime load, which lines up well with when rooftop solar is generating. Cooling your home on solar you produce yourself cuts what you draw from the grid, and adding a battery lets you store that solar to run the aircon into the evening.

How do I know what size air conditioner I need?

Sizing depends on room dimensions, ceiling height, insulation, windows and which way the home faces. An undersized unit struggles on extreme days and an oversized one wastes energy. The reliable way is an on-site assessment where an installer measures the space and matches capacity to your home.