Ducted air conditioning is a centralised system designed to cool or heat an entire home through a series of ducts installed in the ceiling or under the floor. Unlike split systems, which are made to control the temperature in individual rooms using separate indoor units, ducted aircon is powered by one central unit that distributes air evenly to multiple zones. It’s an ideal solution for those wanting whole-home comfort, a sleek and discreet look, and the convenience of controlling everything from a single interface.

The cost to install ducted air conditioning in Australia typically ranges from $8,000 to $15,000, but can go higher for large homes or complex installations. This price includes the system itself, ductwork, zoning, and professional installation.

Smaller single-storey homes may fall on the lower end of the scale, while multi-storey or larger properties often require more powerful systems and extra labour. Compared to split systems, ducted air conditioning offers whole-home comfort but comes with a higher upfront cost.

Key Takeaways

• Installing ducted air conditioning typically costs between $8,000 and $15,000.
• Home size, number of zones, and system brand all affect the final price.
• Replacing an existing system may include extra costs for removal and duct upgrades.
• Energy-efficient models can reduce long-term running costs despite higher upfront prices.

Factors Affecting Ducted Air Conditioning Cost

The price of installing ducted air conditioning can vary a lot depending on your home and the system you choose. Here are the main things that affect how much you’ll end up paying:

The Size and Layout of Your Home

Bigger homes need bigger systems — simple as that. If you’ve got a large house, high ceilings, or multiple levels, you’ll need more powerful air conditioning and more ducting to reach every room. That adds to both the equipment and the labour costs. Smaller, single-level homes are usually cheaper and quicker to install.

How Many Zones You Want

Zoning means you can control the temperature in different parts of your home separately, which is great for saving energy. But more zones mean more parts to install — extra ducts, dampers, and controllers — and that bumps up the price. If you don’t need every room cooled individually, fewer zones will keep the cost down.

The Brand and Energy Efficiency of the System

Like with most things, you get what you pay for. Well-known brands like Daikin, Mitsubishi, and Fujitsu might cost more upfront, but they usually last longer and run more efficiently. Going for an energy-efficient model might mean a higher price tag at first, but it can save you money on your power bills in the long run.

How Tricky the Installation Is

Every house is different, and some are just harder to work with. If your roof space is tight, your house has multiple storeys, or you’re upgrading an older system, the job can take longer and cost more. Newer homes or simple layouts usually make the job easier — and cheaper.

Extra Parts and Components

It’s not just the aircon unit and the ducts that add up — there are a bunch of extra bits that make the whole system work smoothly. Things like thermostats, vents (called grilles and registers), dampers, and proper insulation can all impact the total cost. These might seem like small add-ons, but they play a big part in how efficient and comfortable your system is. Cheaping out here can lead to higher energy bills or uneven airflow down the track.

What the Ducts Are Made Of

The type of ducting used in your system can also affect the final price. Metal ducts are strong and long-lasting but usually more expensive. Flexible ducting is more affordable and easier to install, especially in tight spaces, but it may not always be as durable or efficient in the long run. Your installer can help you figure out which option makes the most sense for your home and budget.

Cost to Replace Ducted Air Conditioning

So, how much does it actually cost to replace a ducted air conditioner? On average, you’re looking at around $7,500 to $14,000 for a full replacement. This includes taking out the old unit, checking or upgrading the ductwork, and installing a new system.

Here’s what you’re typically paying for:

• Old system removal – safe disposal and access work.
• Ductwork repairs or upgrades – especially if the original system was installed many years ago.
• New air conditioning unit – including zoning and smart controls, if needed.
• Labour and setup – for safe and compliant installation.

If your existing ductwork is in great condition, that can bring the cost down quite a bit.

When to Replace vs Maintain Your Ducted System

Not sure whether you need a full replacement or just a repair? Here are some signs it might be time to replace your system:

• It’s more than 15 years old.
• It’s constantly breaking down or needing repairs.
• Your energy bills are climbing for no clear reason.
• The air feels uneven or weak in certain rooms.
• The system is noisy or blowing dust.

If none of these apply, regular maintenance (like cleaning filters and having the system checked annually) might be all you need to keep things running smoothly for a few more years.

How to Save Money on Ducted Air Conditioning Cost

Ducted air con is a big investment, but there are ways to keep costs down without sacrificing quality:

• Get multiple quotes – Prices can vary a lot between installers, so shop around.
• Choose the right size – Oversized or undersized systems cost more to run and wear out faster.
• Stick with trusted brands – They might cost more upfront but save money over time.
• Use existing ductwork – If it’s in good condition, reusing it can cut thousands off your bill.
• Look for rebates – Check if any government energy efficiency incentives are available in your area.
• Plan ahead – Off-season installs (like autumn or spring) might come with better rates.

Ducted Air Conditioning Services on the Sunshine Coast

Choosing the right air conditioning system is a big decision — and with ducted systems, it’s important to get it right from the start. The total cost can vary depending on your home’s size, layout, insulation, and other specific needs, which is why a personalised assessment makes all the difference.

While the initial investment may seem substantial, you also need to consider the long-term benefits of energy efficiency, improved comfort, and enhanced property value.

If you’d like tailored advice and a free quote based on your home, feel free to get in touch with our team. No pressure — just honest recommendations to help you make the best choice.

FAQ

How much does it cost to install ducted air conditioning in Australia? 

Installing ducted air conditioning in Australia usually costs between $8,000 and $15,000. The exact price depends on your home’s size, the system type, and how complex the installation is.

What is the cost to replace ducted air conditioning? 

Replacing a ducted air conditioning system typically costs between $7,500 and $14,000. This includes removing the old unit, updating any ductwork, and installing the new system.

Why is ducted air conditioning so expensive? 

Ducted systems are expensive because they cool your entire home and require more parts and labour. You’re paying for the unit, ductwork, vents, zoning controls, and professional installation.

What affects the cost of ducted air conditioning? 

The main factors are home size, number of zones, ducting complexity, and the brand of system. Extras like smart controls, quality insulation, or tricky roof access can also increase the total cost.

Is it cheaper to replace or install ducted air conditioning? 

Replacement is usually cheaper than a brand-new install. If your ductwork is still in good condition, you’ll save on materials and labour compared to installing from scratch.

Can I use my old ductwork for a new ducted air conditioning system? 

Yes, as long as the old ductwork is in good shape and compatible with your new system. If it’s worn out, leaking, or outdated, it may need to be replaced to ensure proper performance.

How long does ducted air conditioning last? Most ducted systems last 10 to 15 years with regular maintenance. High-quality systems can last up to 20 years, but efficiency tends to drop and repairs become more frequent over time.