Ducted vs Split System Air Conditioning Cost in 2026

If you're weighing up ducted vs split system cost for an Australian home in 2026, here's the short version: a single split system costs roughly $1,100–$3,400 installed, while whole-home ducted air conditioning runs from about $8,500 for a small single-storey house to $25,000+ for a large two-storey one. The right answer depends on how many rooms you actually need to cool — and that's where most people get the maths wrong.

This guide breaks down real installed prices for both systems, what a multi head split system costs as the middle option, ducted aircon running costs, and which air conditioning is cheaper over the life of the system. Whether you're in a Brisbane Queenslander, a Melbourne townhouse or a new build in Perth, the cost drivers are the same.

Want a number for your own home right now? The free split system install quote calculator gives you an instant ballpark in about 30 seconds.

Last updated: November 2026.

Key takeaways

• A single split system costs about $1,100–$3,400 installed in 2026, depending on size (kW), brand tier and how complicated the install is.
• Ducted air conditioning costs about $8,500–$15,000 for most homes, and $20,000–$32,000 for large two-storey houses with poor roof access.
• A multi head split system ($5,000–$6,100 for three rooms) is the middle path — multiple rooms cooled off one outdoor unit, no roof space needed.
• The crossover point is roughly four rooms. Below that, splits are cheaper to buy and run. At four or more rooms, ducted becomes price-competitive and tidier.
• Ductwork is the hidden line item — on a new 150 m² ducted install it adds about $3,000 before GST, which is why replacing an old ducted system with reusable ducts costs thousands less than a first-time install.

This is a price indication only. Your tradie will confirm the final price after assessing the job.

Table of contents

• Ducted vs split system cost at a glance
• What does a split system cost to install?
• What does ducted air conditioning cost?
• How much does a multi head split system cost?
• Ducted aircon running costs vs split system running costs
• Which air conditioning is cheaper overall?
• How to keep the cost down
• Frequently asked questions

Ducted vs split system cost at a glance

Here's what Australians are paying for air conditioning installation in 2026, including GST:

Where these numbers come from: the ranges are calculated from the default rate cards in Leadkit's ducted air conditioning cost calculator and split system install calculator — the same tools Australian HVAC installers embed on their own websites. Leadkit builds and runs those calculators, so this is our own pricing data, not third-party research. There's no city multiplier in either tool, so treat any Sydney or Melbourne premium you're quoted as local market pricing rather than a fixed rule.

This is a price indication only. Your tradie will confirm the final price after assessing the job.

What does a split system cost to install?

A split system costs roughly $650 in installation labour plus the unit itself, which in 2026 works out to around $180 per kilowatt of cooling capacity for a budget brand — before brand tier and site extras.

A quick sizing rule installers use: a bedroom needs about 0.15 kW of cooling per square metre, a living room about 0.18 kW. So a 12 m² bedroom lands on a 2 kW unit, and a 25 m² lounge needs about 4.5 kW. Oversizing wastes money twice — upfront and on your power bill.

Worked examples from the calculator's default rates (all inc. GST):

• 12 m² bedroom, budget brand (Kelvinator, Hisense, TCL): about $1,100 installed.
• 25 m² living room, mid-range brand (Daikin, Mitsubishi Electric, Fujitsu): about $1,900 installed.
• 45 m² open-plan area, premium model (think Daikin Zena or Samsung WindFree): about $3,400 installed.

The brand tier matters more than most people expect — mid-range units price about 35% above budget, and premium models about 80% above. Site conditions add up too: extra refrigerant pipe runs about $75 per metre beyond the standard 3 m, a high wall or upstairs install adds around $250, relocating the outdoor unit away from a back-to-back position (indoor and outdoor units on opposite sides of the same wall — the cheapest layout) adds about $350, and a new dedicated circuit around $400.

One non-negotiable: in Australia, anyone who handles refrigerant must hold an ARCtick licence from the Australian Refrigeration Council. A cheap installer without one isn't a bargain, it's a liability.

For the full breakdown on single units, see our guide to split system air conditioning costs across Australia.

What does ducted air conditioning cost?

Ducted air conditioning costs between $8,500 and $32,000 installed in 2026, with most Australian homes landing in the $12,000–$15,000 band for a medium-sized single-storey house with five to six zones.

The big cost drivers, using the default rates from Leadkit's ducted calculator:

• Home size sets the base unit cost: roughly $4,800 for a home under 120 m², $6,500 for 120–200 m², $8,500 for 200–300 m² and $11,000 for 300 m²+ (before brand tier).
• Zoning — motorised dampers in the ductwork that let you cool areas independently — adds about $500 per zone. A standard 3–4 bedroom home runs 5–6 zones.
• New ductwork costs about $20 per m² of conditioned area. On a 150 m² home that's $3,000 before GST.
• Two-storey homes add around $2,000, tight or limited roof access adds $600–$1,200, and older homes often need a switchboard upgrade (about $1,200) to handle the load.

Worked examples (inc. GST): a small single-storey home on a budget-tier unit comes in around $8,500–$9,400. A 150 m² home with 5–6 zones and a mid-range inverter unit lands near $13,500. A 250 m² two-storey with premium gear, tight roof access and a switchboard upgrade pushes past $25,000.

Across the air-conditioning estimates generated through Leadkit's calculators, the ductwork line is the one homeowners most often forget to budget for — and it's also why a replacement is so much cheaper than a first install. If your existing ducts are in good condition and can be reused, that 150 m² job drops from about $13,500 to roughly $10,200. As a sanity check, Leadkit runs two independent ducted pricing models, and they land within about 6% of each other on the same job — a good sign the ranges are honest.

City-specific guides: ducted air conditioning cost in Sydney and Melbourne.

This is a price indication only. Your tradie will confirm the final price after assessing the job.

How much does a multi head split system cost?

A multi head split system — several indoor wall units running off one outdoor compressor — costs about $5,000–$6,100 installed for three rooms in 2026.

The pricing logic: each indoor head costs its unit price plus around $650 install labour, and the shared outdoor unit adds a multi-split premium of roughly $400 per extra head. Three mid-range 2.5 kW bedroom heads work out around $5,000 inc. GST on Leadkit's split calculator defaults; our broader installation calculator prices the same three-head job closer to $6,100, which brackets the realistic market range.

When multi-split beats ducted:

• No usable roof space — flat roofs, cathedral ceilings and apartments often can't take ductwork at all.
• You only need 2–4 rooms cooled, not the whole house.
• Renovating in stages — you can size the outdoor unit for future heads.

When ducted beats multi-split: once you're cooling four or more rooms, the per-room cost of heads, pipe runs and the beefier outdoor unit closes in on a small ducted system — and ducted leaves you with discreet ceiling vents instead of a wall unit in every room.

Mid-post shortcut: get an instant multi-split or ducted price for your home — free, 30 seconds, no signup.

Ducted aircon running costs vs split system running costs

A single split system is clearly cheaper to run than ducted — typically somewhere around 20–50 cents an hour for one room, versus roughly $1.50–$3 an hour for a whole-home ducted system at 2026 electricity tariffs. These are general guides rather than calculator outputs; your actual cost depends on the unit's efficiency, your tariff and how hard the system works on a 40-degree day.

The reason is simple physics: a 2.5 kW bedroom split draws well under a kilowatt of electricity thanks to inverter technology, while a ducted unit sized for a whole house has several times the capacity and draws accordingly.

Three things narrow the gap:

• Zoning. A zoned ducted system cooling only the living area during the day and only bedrooms at night can run at a fraction of its full-house draw. Unzoned ducted systems are the real power hogs.
• Efficiency ratings. Check the Zoned Energy Rating Label on energyrating.gov.au — it rates performance separately for hot, average and cold Australian climate zones, so a unit that's efficient in Darwin isn't automatically efficient in Hobart.
• Behaviour. Four splits running flat-out all evening can cost more than a well-zoned ducted system doing the same job.

Rule of thumb: if you'd regularly run three or more splits at once, the ducted running-cost penalty mostly disappears.

Which air conditioning is cheaper overall?

Split systems are cheaper for cooling one to three rooms; ducted becomes the better-value option at four or more rooms, or when you want whole-home comfort and resale appeal.

Run the 10-year numbers on a typical 3–4 bedroom home:

• Three splits (living + two bedrooms): about $5,000–$6,500 upfront, modest running costs, but three outdoor units on your walls and no cooling in the other rooms.
• Ducted, 5–6 zones: about $13,500 upfront, higher running costs if used lazily, similar if zoned well — and every room is covered.

The non-cash factors tip it further. Ducted is near-silent indoors, invisible except for vents, and real estate agents consistently list it as a selling feature on family homes. Splits win on redundancy (one failed unit doesn't kill the whole system), apartment-friendliness and the ability to stage your spend.

If your budget sits in the awkward $6,000–$9,000 gap between the two, that's exactly where a multi head split system earns its keep.

How to keep the cost down

There are four levers that genuinely move the price, and none of them involve cutting corners on the install.

1. Reuse existing ductwork. If you're replacing an old ducted system and the ducts are sound, you save around $3,300 inc. GST on a 150 m² home. Have the installer actually inspect them — perished duct insulation leaks money forever.
2. Pick the right brand tier. Budget-tier ducted units price about 18% below mid-range; premium runs about 25% above. Mid-range (Daikin, Mitsubishi, Fujitsu) is the sweet spot for most homes — proven reliability without the premium badge tax.
3. Chase the rebates. Victorian households can claim Victorian Energy Upgrades discounts of up to $1,610 on non-ducted systems and up to $5,530 when replacing a ducted gas heater with efficient electric ducted reverse-cycle — units need a five-year warranty to qualify under the rules in force since 31 March 2025. Check the Victorian Energy Upgrades program for current eligibility, and your own state's energy scheme elsewhere.
4. Get the sizing right, not generous. Oversized systems cost more upfront, short-cycle, and dehumidify poorly. Use the m²-based sizing above as your sanity check against any quote.

And get more than one quote. The spread between installers on an identical ducted job can run into the thousands, especially in peak summer when books are full.

Frequently asked questions

Q: Is ducted or split system air conditioning cheaper to install?

A: Split systems are far cheaper to install — about $1,100–$3,400 per unit in 2026 versus $8,500–$32,000 for ducted. But the comparison only makes sense per room: three splits cost $5,000–$6,500, which is within sight of a small ducted system at $8,500. Below four rooms, splits win on price every time. At four or more rooms, ducted becomes competitive once you factor in the cost of multiple outdoor units, extra pipe runs and separate electrical circuits for each split.

Q: How much does a multi head split system cost in 2026?

A: A three-head multi split system costs about $5,000–$6,100 installed, based on the default rates in Leadkit's air conditioning calculators. Each extra indoor head adds roughly $1,000–$1,650 depending on size and brand tier, plus a multi-split premium on the shared outdoor unit. It's the go-to option for apartments and homes without roof space for ducts.

Q: Is ducted air conditioning expensive to run?

A: It can be, but zoning changes everything. An unzoned ducted system cooling the whole house can cost $1.50–$3 an hour at typical 2026 tariffs, versus 20–50 cents for a single split. Run the same ducted system zoned — living areas by day, bedrooms by night — and the hourly cost drops sharply. Check the Zoned Energy Rating Label on energyrating.gov.au before you buy; efficiency varies a lot between models and climate zones.

Q: Can I save money replacing an old ducted system?

A: Yes — if your existing ductwork is reusable, a replacement costs about $3,300 less than a new install on a typical 150 m² home, because new ductwork runs about $20 per m² of conditioned area. Get the installer to inspect the ducts for crushed sections, perished insulation and rodent damage before quoting. You can price both scenarios side by side with the air conditioning installation quote calculator.

Q: What size split system do I need?

A: Multiply the room's floor area by about 0.15 kW/m² for a bedroom or 0.18 kW/m² for a living area. A 12 m² bedroom needs about 2 kW, a 25 m² lounge about 4.5 kW, and a 45 m² open-plan space about 7.5 kW. Bigger isn't better — an oversized unit cycles on and off, controls humidity poorly and costs more upfront.

Q: Who can legally install air conditioning in Australia?

A: Any installer handling refrigerant must hold an ARCtick licence from the Australian Refrigeration Council, and the electrical connection must be done by a licensed electrician. Ask to see both licences before work starts — it's a standard request and a legitimate tradie won't blink. Unlicensed refrigerant handling voids most manufacturer warranties and attracts real penalties.

Q: Does ducted air conditioning add value to a home?

A: Generally, yes — whole-home ducted reverse-cycle is a recognised selling feature on family homes in most Australian capitals, and buyers read it as a finished, comfortable house. A wall of split systems doesn't carry the same weight, although in apartments a tidy multi-split is the expected standard. Treat the resale factor as a tiebreaker rather than the main justification, since you're spending real money today for uncertain value tomorrow.

The bottom line on ducted vs split system cost

For one to three rooms, split systems win: $1,100–$3,400 per unit installed, cheap to run, easy to stage. For whole-home comfort across four or more rooms, ducted earns its $12,000–$15,000 typical price with zoning, silence and resale appeal — and a multi head split covers the middle ground when roof space or budget rules ducted out.

Whatever you choose, get the sizing checked, confirm the ARCtick licence, and compare at least two quotes against an independent benchmark.

Want an instant price for your home? Try the free air conditioning quote calculators — pick split, multi-head or ducted, answer a few questions, and get a ballpark in 30 seconds. This is a price indication only. Your tradie will confirm the final price after assessing the job.