Whole-home ducted reverse-cycle air conditioning in Australia commonly costs from around $9,000 for a smaller home to $20,000 or more for a large home with zoning, fully installed. Where you land inside that range depends mostly on the size of your home, the number of zones, the capacity of the unit and how fiddly the ducting run is (last checked June 2026).
It is one of the bigger home-comfort spends you will make, sitting somewhere between a kitchen tidy-up and a full bathroom redo. The good news is that the price drivers are fairly predictable, so once you understand them you can read a quote without feeling like you are being snowed.
What you are actually paying for
A ducted system is not just a box on the roof. You are buying an outdoor compressor, an indoor fan coil unit (usually tucked into the roof space), a network of insulated ducting fanning out to each room, ceiling vents, a controller and, if you opt for it, zoning hardware that lets you cool the living areas without blasting the empty bedrooms.
The single biggest lever on price is capacity, measured in kilowatts. A bigger home needs more cooling and heating grunt, which means a larger and pricier unit, more ducting and more labour to install it. Add a tricky roof cavity, a double storey layout or a heritage ceiling you cannot cut into freely, and the labour line climbs further.
A rough price guide by home size
These bands are indicative only and will shift with your location, brand, installer and the state of your roof space. Treat them as a starting point for conversations, not a quote.
| Home size | Typical setup | Indicative installed cost |
|---|---|---|
| Small home or apartment | Lower capacity, few or no zones | Around $9,000 to $12,000 |
| Mid-size family home | Mid capacity, 3 to 5 zones | Around $12,000 to $16,000 |
| Large home | High capacity, multiple zones, longer runs | Around $16,000 to $20,000 plus |
If your quote sits well outside these ranges, that is not automatically a red flag. It just means something specific is going on, a long cable run, a hard-to-access unit, premium hardware, and you are entitled to ask the installer to spell it out.
What pushes the cost up or down
A handful of factors do most of the heavy lifting:
- Home size and layout. More floor area and more rooms means more capacity and more ducting.
- Number of zones. Zoning adds hardware up front but lets you cool only the rooms you are using.
- Unit capacity and efficiency. A higher star rating often costs more to buy and less to run.
- Ducting complexity. Tight roof spaces, two storeys and awkward access all add labour.
- Brand and warranty. Premium brands and longer warranties carry a premium price.
The temptation is to chase the cheapest sticker price. Resist it. An undersized unit that runs flat out every summer will cost you more over its life than a correctly sized one, and a botched install is a misery to unwind. This is the same logic that applies across most big home jobs, which we dig into in our guide to home renovation costs in Australia.
Running costs are the other half of the story
The install is a one-off. The power bill is forever, or at least for the 10 to 15 years the system is likely to last. Running cost depends on how much you use it, how efficient the unit is, and how smartly you zone and set it.
A few habits make a genuine difference: cooling only the rooms in use, setting the thermostat to a sensible temperature rather than an arctic one, and letting a good controller do the thinking. Zoning is your friend here, because heating or cooling an empty four-bedroom home is money poured straight out the vents. For more ways to take the sting out of the bill, our piece on how to lower your electricity bill covers the levers worth pulling.
Get the sizing right first, then chase efficiency. A correctly specced system is cheaper to run than a bargain one that never stops.
Ducted or split system?
Ducted is not always the answer. If you only need to keep a bedroom or two and the living area comfortable, a split system, or a few of them, is far cheaper to buy and install. Splits cool individual spaces and are simple to retrofit, which makes them the sensible pick for smaller homes, apartments or renters who want comfort without committing to ductwork.
Ducted earns its keep when you want even, whole-home comfort, a tidy look with vents instead of wall units, and the flexibility of zoning. It is a bigger upfront cheque, but in a larger family home it is often the more livable choice. The honest answer for many households is somewhere in between: ducted for the main living zones, or a couple of well-placed splits, depending on how the home is actually used.
Get the sizing and the installer right
The most expensive mistake is poor sizing. Too small and the system struggles and runs up bills, too big and you have overpaid and may get short, inefficient cycles. A licensed installer should do a proper load calculation based on your home, not just glance at the floor plan and guess.
Always get multiple written quotes that itemise the unit, the ducting, the zoning and the labour, so you can compare like with like. Check licensing and reviews before you sign anything, the way we walk through in our guide on how to find a good tradie. When you are ready to compare real numbers for your home, you can get ducted air conditioning quotes and line them up side by side rather than relying on a single ballpark.
This article is general information only and is not personal financial, tax or legal advice. Figures are indicative and were last checked June 2026. Prices, product availability and energy rates change, so confirm current costs with licensed installers and your energy retailer before you commit.
The bottom line
Budget somewhere from around $9,000 for a smaller home to $20,000 or more for a large, fully zoned home, and remember the running cost matters as much as the install. Get the sizing right with a licensed installer, weigh ducted against a few splits honestly, and compare itemised quotes before you commit. Spend a little longer choosing well, and you will feel it every summer and on every bill.