What Does Ducted Air Conditioning Cost in Australia?
The total installed cost of ducted air conditioning in Australia typically falls between $5,000 and $20,000, with most homes landing somewhere in the $8,000 to $14,000 range. This wide spread exists because ducted air conditioning cost is driven by several variables: the size of your home, the capacity of the system you need, how complex the installation is, and the brand you choose. This guide breaks each of those factors down so you can work out where your home sits on that spectrum before you get a single quote.
A ducted system works differently to a split system. Rather than a wall-mounted unit cooling one room, a ducted system uses a central unit (usually in the roof space) connected to a network of ducts and ceiling vents that deliver conditioned air to multiple rooms across the home. The result is whole-home comfort with no visible indoor units, but the trade-off is a higher upfront cost and a more involved installation.
Key Factors That Affect Ducted Air Conditioning Cost
No two ducted installations are the same, which is why quotes can vary by thousands of dollars for homes of similar size. Understanding what drives the price helps you have a more informed conversation with your installer and avoid paying for things you do not need.
System Size and Capacity
The capacity of a ducted air conditioners system is measured in kilowatts, and getting the right size for your home is one of the most important decisions you will make. A common starting point is roughly 125 to 150 watts per square metre of conditioned floor space, so a 200m² home would typically need a system in the 10 to 12kW range, while a 300m² home might require 14 to 16kW or more.
Undersizing is a false economy. A system that is too small will run constantly trying to reach your set temperature, wearing itself out faster and driving up your electricity bill. Oversizing causes its own problems: the system short-cycles (switching on and off too frequently), which reduces humidity control and puts unnecessary strain on the compressor.
To give you a real-world benchmark, the Daikin 10kW Inverter Ducted Air Conditioner FDYAN100 is priced at $4,017 for supply only, making it a solid mid-range option for homes around 150 to 200m². At the larger end, the Daikin 16kW Inverter Ducted Air Conditioner FDYAN160 comes in at $5,814 supply only, suited to homes of 250m² and above. If you want a value-competitive alternative at the 10kW tier, the Fujitsu 10kW Inverter Ducted Air Conditioner System SET-ARTH36KHTA is available for $3,620 supply only, illustrating how brand choice alone can shift the unit cost by several hundred dollars before installation is even factored in.
Installation Complexity
Labour is often the biggest variable in a ducted quote, and it comes down to how easy (or difficult) your home is to work in. A single-storey home with a generous roof cavity, short duct runs, and an existing system being replaced is about as straightforward as it gets. Installers can move efficiently, and labour costs reflect that.
A new installation in a double-storey brick home is a different story. Longer duct runs, limited ceiling access, the need to route ducts between floors, and more complex return air arrangements all add time and materials. Homes with flat or low-pitched roofs can also complicate things, as there may not be enough clearance to house the indoor unit and run ducts properly. As a rough guide, expect installation labour to add $3,000 to $7,000 on top of the unit supply cost, with complex jobs pushing beyond that.
If you are replacing an existing ducted system and the ductwork is in good condition, you may be able to reuse it, which can save $1,500 to $3,000 compared to a full new install. Ask your installer to assess the existing ductwork before assuming it needs to be replaced.
Zoning and Smart Controls
Zoning lets you divide your home into independently controlled areas, so you are only conditioning the rooms you are actually using. A basic two-zone setup adds relatively little to the upfront cost, but a fully zoned eight-room system with motorised dampers can add $1,500 to $3,000 or more to the installation price. The payback comes through lower running costs, since you are not cooling empty bedrooms or unused living areas.
Most modern ducted systems also support Wi-Fi controllers and app control as either standard inclusions or optional add-ons. These typically add $200 to $500 to the total cost but make a real difference to day-to-day usability. Being able to pre-cool your home before you arrive, or check that you turned the system off after leaving, is genuinely useful rather than just a novelty.
If your home has a clear day zone and night zone (living areas versus bedrooms), a two-zone setup is usually the minimum worth considering. Homes with more varied usage patterns, like a home office that runs independently of the rest of the house, benefit from more granular zoning even if the upfront cost is higher.
Ducted Air Conditioning Price Ranges: Supply vs Installed Cost
Unit Supply Prices
Buying your unit separately from a retailer like OzAir and arranging your own licensed installer is one of the most effective ways to reduce the total cost of a ducted project. When you purchase through an installer, their margin on the equipment is built into the quote. Buying supply-only removes that margin entirely.
To give you a concrete sense of what units cost at different capacity tiers, here are three real benchmarks from the OzAir range:
| System | Capacity | Supply Price | Suited To |
|---|---|---|---|
| Fujitsu Inverter Ducted SET-ARTH36KHTA | 10kW | $3,620 | Homes up to ~180m² |
| Daikin Inverter Ducted FDYAN100 | 10kW | $4,017 | Homes up to ~180m² |
| Daikin Inverter Ducted FDYAN160 | 16kW | $5,814 | Homes 250m² and above |
The Fujitsu and Daikin 10kW units sitting $397 apart at the same capacity tier is a good illustration of how brand choice shifts the unit cost before a single duct is run. Both are quality inverter systems. The price difference comes down to brand positioning rather than a meaningful gap in reliability or performance at this tier.
These supply-only prices represent the unit cost alone. Labour, ductwork, and a controller are all additional, which is what the next section covers.
Total Installed Cost Estimates
Once you factor in labour, ductwork, ceiling vents, a controller, and any electrical work required, the total installed cost climbs considerably above the unit price. The table below gives realistic all-in ranges by home size, based on a standard single-storey installation with a new duct layout.
| Home Size | Typical Installed Cost | What's Included |
|---|---|---|
| Small (up to 150m²) | $5,000 – $9,000 | Supply, labour, ductwork, basic controller |
| Medium (150–250m²) | $9,000 – $14,000 | Supply, labour, ductwork, basic controller |
| Large (250m²+) | $14,000 – $20,000+ | Supply, labour, ductwork, basic controller |
These ranges assume a reasonably accessible roof cavity and a straightforward single-storey layout. Multi-storey homes and properties requiring a full new duct installation from scratch will sit at the top of each range, or push beyond it. If your home has a flat roof, a concrete slab ceiling, or very limited roof space, expect your installer to flag additional complexity costs during the quoting process.
Replacing an existing ducted system where the ductwork is still serviceable is typically cheaper than a brand-new installation, since reusing existing ducts can save $1,500 to $3,000 in materials and labour. Always ask your installer to assess the existing ductwork condition before assuming it needs to go.
For a more detailed breakdown of what drives installation pricing, including electrical upgrades and zoning costs, see our guide to air conditioning installation cost.
Ducted vs Split System: Which Is Worth the Cost?
Ducted air conditioning is not the right answer for every home or every budget. Before committing to a system that costs $10,000 or more installed, it is worth being clear-eyed about what you are actually getting for that money compared to the alternative.
Split system air conditioners are the most common alternative, and for good reason. A quality 7kW split system can be supplied and installed for $1,500 to $2,500. Two or three of them, covering the main living areas and bedrooms, can condition most of a home for $4,000 to $7,000 total. That is a meaningful saving compared to a ducted system, and for homes under 150m² or households that only use a few rooms regularly, split systems often make more financial sense.
The case for ducted comes down to three things: whole-home coverage, aesthetics, and liveability. A ducted system conditions every room through ceiling vents with no visible indoor units on the walls. For open-plan homes, larger properties, or anyone who values a clean interior look, that matters. Split systems require a wall unit in each room, which some people find visually intrusive and which limits where furniture can be placed.
Running costs are more nuanced than they first appear. A large ducted system conditioning an entire home will use more electricity than a single split system running in one room. But compared to running three or four split systems simultaneously, a well-zoned ducted system can be competitive. The key word is 'zoned': a ducted system without zoning that conditions the whole home all day is genuinely expensive to run. For a full comparison of ongoing costs, our guide to how much air conditioning costs to run breaks down the numbers by system type.
The honest summary: if you own a larger home, plan to stay long-term, and want whole-home comfort with a clean finish, ducted is worth the investment. If you rent, live in a smaller home, or only need to condition a few rooms, split systems will almost certainly give you better value for money.
How to Reduce Your Ducted Air Conditioning Cost
A ducted system is a significant investment, but there are several practical ways to bring the total cost down without cutting corners on quality. None of these tips require compromising on the system itself.
Buy supply-only and source your own installer. Purchasing your unit from an online retailer like OzAir and arranging a separate licensed installer removes the equipment margin that installers typically build into their quotes. The unit prices you see at OzAir, like the $4,017 Daikin FDYAN100 or the $3,620 Fujitsu SET-ARTH36KHTA, are what you actually pay for the hardware. Your installer then quotes labour only, which is a more transparent arrangement and often cheaper overall.
Get at least three installer quotes. Labour pricing for ducted installations varies considerably between tradespeople, even in the same suburb. Three quotes gives you a realistic sense of the market rate and makes it easier to spot an outlier in either direction. A quote that is dramatically lower than the others is worth scrutinising, not just accepting.
Size the system correctly, not generously. Oversizing is a common and costly mistake. A system that is too large for your home costs more upfront and runs less efficiently than a correctly sized unit. Use the 125 to 150 watts per square metre rule as a starting point and ask your installer to do a proper load calculation before specifying a capacity.
Choose an inverter system. All three units mentioned in this guide are inverter models, and that matters for running costs. Inverter compressors adjust their output to match demand rather than switching on and off at full power, which can reduce electricity consumption by 30 to 50% compared to older fixed-speed systems. The upfront cost is slightly higher, but the savings compound over years of use.
Time your purchase outside peak summer demand. Installers are busiest from November through February, and some charge a premium during that period simply because demand outstrips supply. Purchasing and installing in autumn or winter often means shorter lead times, more competitive quotes, and installers who have more time to do the job properly.
Ready to Get a Ducted System? Here's Where to Start
Ducted air conditioning in Australia typically costs between $8,000 and $14,000 installed for most homes, with the final figure shaped by system capacity, installation complexity, and how you source the equipment. It is a meaningful upfront investment, but for whole-home comfort with no visible wall units and the ability to zone your home intelligently, most owners find it worthwhile over the long term.
The best starting point is knowing what unit you need and what it should cost before you speak to an installer. Browse the full OzAir ducted air conditioner range to compare brands, capacities, and supply prices across Daikin, Fujitsu, and more. If you want a clearer picture of what labour and installation will add to that figure, our air conditioning installation cost guide covers the detail on what drives those numbers.
Frequently Asked Questions
How much does a ducted aircon cost in Australia?
Supply-only ducted air conditioning units range from roughly $3,000 to $6,500 or more depending on capacity and brand, while total installed costs typically fall between $5,000 and $20,000 for most Australian homes. The biggest variables are your home's size, the brand and model you choose, and how complex the installation is, particularly if new ductwork or ceiling modifications are needed. See the price table earlier in this article for a capacity-by-capacity breakdown.
What is the $5000 rule for AC?
The '$5,000 rule' is an informal industry guideline suggesting that if repairing an existing air conditioning system is going to cost more than $5,000, you are generally better off replacing the unit entirely. It is a rough benchmark rather than a hard rule, so system age and energy efficiency should factor into the decision as well. An older, inefficient unit that needs a $4,500 repair may still be worth replacing if it is running up high electricity bills every season.
How much is Daikin 16kW ducted installed?
The Daikin 16kW inverter ducted unit (FDYAN160) is available from OzAir for $5,814 supply only. Labour, ductwork, and commissioning typically add $3,000 to $6,000 on top of that, putting the all-in installed price in the $9,000 to $12,000 range for most homes. Exact installation costs vary depending on your location, ceiling access, and the complexity of the job, so it is worth getting a few quotes from local installers.
What AC is best for allergies?
Ducted systems with high-quality filtration are a strong choice for allergy sufferers because they filter the air across the entire home rather than just one room. Daikin and Fujitsu both offer ducted models with advanced multi-stage filtration options, including HEPA-grade filters on select units. Regardless of brand, regular filter cleaning is essential to maintain those air quality benefits, as a clogged filter can actually circulate dust and allergens rather than capturing them.