Ducted vs Split System: Understanding the Basics
If you're building a new home, renovating, or replacing an ageing unit, the ducted vs split system decision is one of the first questions you'll face. It's also one of the most consequential, because the wrong choice can mean years of higher bills, uncomfortable rooms, or a system that simply doesn't suit your home. Both options cool and heat effectively, but they work differently, cost differently, and suit different types of homes.
A ducted system runs from a single central unit, usually tucked away in the roof cavity or under the floor, pushing conditioned air through a network of insulated ducts to vents throughout the home. A split system pairs a wall-mounted indoor unit with an outdoor compressor to condition a single room or open-plan space.
The right choice comes down to five key factors: upfront cost, running cost, installation complexity, how well your home suits each system, and aesthetics. This article covers all five so you can make a confident call.
Key takeaways
- Ducted vs split system choice depends on home size, budget and whether you're building or retrofitting.
- Ducted systems cost $8,000–$15,000 installed but suit large homes; split systems cost $1,500–$3,500 and work best for apartments or single rooms.
- Running costs depend on how many zones you condition simultaneously and inverter efficiency.
- Neither system is universally better; the right choice matches your home's layout and your comfort needs.
How Each System Works
Understanding the mechanics of each system makes the rest of the comparison much easier to follow. Both use the same basic refrigeration cycle to move heat in or out of your home, but the way they deliver conditioned air is quite different.
How Ducted Air Conditioning Works
A ducted system centres on a large indoor unit, typically installed in the roof cavity or under the floor, that most people never see. From that unit, a network of insulated ducts runs through the ceiling or subfloor to individual vents in each room. The result is a system that's almost invisible inside the home, with only small grilles visible in the ceiling or floor.
The outdoor compressor connects to the indoor unit via refrigerant lines and handles the heat exchange. A central controller, usually a wall-mounted panel, lets you manage the whole home from one place. Most modern ducted systems include zone control, which means you can divide the home into groups of rooms and only condition the zones that are actually in use. This is a key feature for managing running costs in larger homes.
A mid-range example like the Daikin 10kW ducted unit (from $4,017 supply-only) gives you a sense of the entry point for a medium-sized home, before installation costs are factored in.
How Split Systems Work
A split system has two main components: a wall-mounted indoor head unit that sits high on an interior wall, and an outdoor compressor unit that sits outside the home. The two are connected by a refrigerant line that runs through a small hole in the wall. The indoor unit draws in room air, conditions it, and circulates it back into the space directly.
A single-head split system is designed to condition one room or an open-plan living area. If you need to cover multiple rooms, a multi-head split system uses one outdoor compressor connected to several indoor heads, which can be a practical middle-ground between a single split and a full ducted installation.
Built-in Wi-Fi is now standard on most mid-range and premium models, letting you control the unit from your phone before you even get home. Control is straightforward: a remote or app handles temperature, fan speed and mode. The Daikin Lite 2.5kW (from $989) is a solid entry-level example for a bedroom or small living area, while the Daikin Lite 7.1kW ($1,977) suits larger open-plan spaces.
Ducted vs Split System: A Side-by-Side Comparison
Ducted systems cost significantly more upfront and require professional installation throughout the roof cavity, while split systems are cheaper to buy, faster to install and better suited to single rooms or smaller homes. The right choice depends on how many rooms you need to condition, your budget and whether you're building new or retrofitting an existing home.
| Criteria | Ducted | Split System |
|---|---|---|
| Upfront Cost (supply only) | $2,800 to $6,000+ (e.g. Daikin 10kW ducted unit from $4,017) | $989 to $3,000+ (e.g. Daikin Lite 2.5kW from $989) |
| Installation Complexity | High. Requires roof cavity access, ductwork, zoning controls and a licensed installer. Add $3,000 to $8,000+ for labour | Low to moderate. One indoor head, one outdoor unit, a small wall penetration. Typically $600 to $1,500 for labour |
| Running Cost | Higher overall draw, but zone control reduces waste in larger homes. Efficiency depends heavily on duct condition and insulation | Lower running cost for single zones. Inverter models are highly efficient. Less effective if you're trying to cool the whole home with multiple heads |
| Whole-Home Coverage | Yes. One system covers every room via the duct network | No. Each head covers one room or open-plan area. Multi-head systems can cover 2-5 rooms but cost more |
| Aesthetics and Discretion | Excellent. Only small ceiling or floor grilles are visible inside the home | Visible wall-mounted unit in each room. Modern designs are slim but still present |
| Best Suited For | Large homes (4+ bedrooms), new builds, renovations, buyers who prioritise whole-home comfort and a clean interior look | Apartments, smaller homes, single rooms, rentals, tight budgets or anyone adding comfort to one or two specific spaces |
The cost gap between these two systems is substantial and worth being honest about. A ducted system for a medium-sized home typically runs $8,000 to $15,000 all-in once installation is factored in. Our ducted air conditioning cost guide breaks down exactly where that money goes, from the indoor unit and ductwork through to zoning controllers and commissioning. For split systems, split system installation costs are far more predictable, usually sitting between $600 and $1,500 per head depending on the complexity of the run and your location.
The suitability question is where most people get tripped up. A ducted system is not automatically the premium choice for every home. In a two-bedroom apartment or a compact house, a ducted system would be expensive overkill. Conversely, trying to cool a five-bedroom home with a handful of individual split systems gets messy fast, both in terms of running costs and the number of wall units cluttering your rooms. The Daikin 10kW ducted unit (from $4,017 supply-only) is a practical mid-range option for a medium-sized home, but that price is before a single metre of ductwork is installed.
Running costs are harder to compare directly because they depend on how you use the system. A ducted system running all zones simultaneously will cost more per hour than a single split system. But if you're only conditioning two or three zones at a time using smart zone control, the gap narrows considerably. The honest answer is that neither system is inherently cheaper to run. It comes down to your home's layout, your habits and how well the system is sized for the space.
Which System Suits Your Home?
The best air conditioning system for your home depends on its size, your budget and whether you're building, renovating or retrofitting. Ducted suits large homes and new builds where ductwork can be installed without major disruption. Split systems suit smaller homes, apartments and anyone who needs comfort in one or two rooms without a significant upfront investment. For 2-3 rooms, a multi-head split system is often the most cost-effective middle ground.
Choose Ducted If...
- Your home has four or more bedrooms and you want consistent comfort throughout
- You're building a new home or undertaking a major renovation where ductwork can be installed before walls and ceilings are finished
- Aesthetics matter and you don't want visible wall units in your living spaces
- Whole-home heating and cooling is the goal, not just one or two rooms
- Your budget allows for a higher upfront cost in exchange for a cleaner, more integrated result
- You want zone control to manage different areas of the home independently
Retrofitting a ducted system into an existing home is possible but significantly more disruptive and expensive than installing during a build or renovation. If you're already mid-renovation with the ceiling open, ducted is almost always the smarter long-term investment. Browse our range of ducted air conditioners to compare capacity options and brands.
Choose a Split System If...
- You're in an apartment, townhouse or smaller home where whole-house ducting isn't practical
- You only need to condition one room or a single open-plan living area
- Your upfront budget is tight and you want a quality system without a five-figure installation bill
- You're renting and need a system that can be installed without major structural work
- You're retrofitting an existing home and want to avoid the disruption of running ductwork through finished ceilings
- You need a larger single-zone solution, such as the Daikin Lite 7.1kW ($1,977) for a big open-plan living and dining area
Modern split systems are quieter and more efficient than ever. Inverter technology means they ramp up and down to maintain temperature rather than cycling on and off, which keeps noise low and running costs in check. The Daikin Lite 2.5kW (from $989) is a strong entry-level option for a bedroom or study, and the range scales up from there to suit larger spaces. Browse our full range of split system air conditioners to find the right capacity for your room.
Running Costs: What You'll Actually Pay to Operate Each System
A single split system is cheaper to run than a ducted system when you only need to condition one or two rooms, because you're only paying to cool or heat the space you're actually using. A ducted system running all zones simultaneously draws significantly more power. But if you need whole-home comfort across four or five rooms, running multiple split systems at once can cost more than a well-zoned ducted system doing the same job.
The key variable is how many rooms you're conditioning at any given time. A zoned ducted system lets you shut off areas of the home you're not using, which brings the running cost down considerably compared to blasting every room at once. The more disciplined you are with zone control, the closer a ducted system's running costs get to what you'd pay running a couple of split systems.
Inverter technology plays a big role in keeping costs manageable for both system types. All modern units, including the Daikin Lite 2.5kW (from $989) and the Daikin 10kW ducted unit (from $4,017 supply-only), use inverter compressors that ramp up and down to maintain your set temperature rather than switching on and off at full power. Compared to older fixed-speed units, inverter systems can cut electricity consumption by 30 to 50 per cent under typical conditions.
As a rough guide, a 2.5kW split system running for eight hours a day might cost $1 to $2 per day depending on your electricity tariff and climate zone. A ducted system covering a whole home can cost $4 to $10 or more per day under the same conditions. Those numbers shift significantly based on insulation quality, how well the system is sized for the space, and local electricity rates. For a full breakdown with real numbers, the air conditioning running costs guide works through the maths in detail for both system types.
One honest caveat: no running cost estimate is reliable without knowing your specific home, your climate zone and your usage habits. A poorly insulated home in Queensland will cost more to cool than a well-sealed home in Melbourne, regardless of which system type you choose. Sizing matters too. An undersized system that runs flat-out all day will cost more than a correctly sized unit that reaches temperature and settles into a low-power maintenance mode.
FAQ: Ducted vs Split System Air Conditioning
Is ducted air conditioning better than a split system?
Neither system is universally better. Ducted air conditioning suits larger homes where whole-home comfort is the goal and aesthetics matter, since the system is almost entirely hidden from view. Split systems are better suited to apartments, smaller homes or anyone who only needs to condition one or two rooms. The right choice depends on your home's size, your budget and how many rooms you need to cool or heat.
How much more expensive is ducted air conditioning to install?
Ducted systems cost significantly more upfront. A full ducted installation for a medium-sized home typically runs $8,000 to $15,000 all-in, covering the unit, ductwork, zoning controls and labour. A single split system installation usually costs $1,500 to $3,500 all-in depending on the unit and complexity of the run. The gap narrows if you're comparing a ducted system against four or five split systems installed across a whole home.
Can I replace ducted air conditioning with split systems?
Yes, it's possible to decommission a ducted system and replace it with multiple split systems, though it's rarely the most cost-effective path. You'd need one split system head per room or zone, which adds up quickly in both purchase price and installation cost. If the existing ductwork is in good condition, repairing or replacing just the central unit is usually cheaper than switching system types entirely.
Which system is cheaper to run, ducted or split?
A single split system is cheaper to run than a ducted system when you're only conditioning one or two rooms. If you need to cool or heat the whole home, a zoned ducted system can be more economical than running four or five split systems simultaneously. Running costs for both system types depend heavily on inverter efficiency, home insulation, correct sizing and how consistently you use zone or room controls to avoid conditioning unused spaces.
Ready to Choose? Browse Our Range
Ducted air conditioning delivers whole-home comfort with a clean, discreet aesthetic that suits larger homes and new builds. Split systems offer targeted, budget-friendly heating and cooling that works brilliantly for apartments, smaller homes and anyone who needs to condition one or two rooms without a major upfront investment. Both are excellent options when matched to the right home.
The good news is that whichever direction you're leaning, there's a quality system at the right price point waiting for you. From entry-level split systems like the Daikin Lite 2.5kW (from $989) through to mid-range ducted units like the Daikin 10kW ducted unit (from $4,017 supply-only), the range covers every home size and budget.
If you're still weighing up your options, our team is happy to help you work through the decision. Reach out and we'll point you in the right direction based on your home, your climate zone and your budget. No pressure, just practical advice.