Kinds of Aircon: Types of Air Conditioners for Australian Homes

Choosing the right kind of aircon for your home starts with understanding what the options actually are — and where each one makes sense. Australian homes vary widely in age, construction, and layout, and the best choice depends on your specific situation rather than a universal recommendation. This guide covers the main types of air conditioners available for Australian homes and what each is suited to.

1. Overview of Common Aircon Types

The main categories of air conditioning you'll encounter for Australian residential use are:

Split systems

• the most widely installed type; one indoor unit, one outdoor unit per room or area

Ducted systems

• central unit connected to multiple room outlets via ceiling ductwork

Multi-split systems

• one outdoor unit connected to multiple indoor units

Portable air conditioners

• freestanding, no installation required, window-vented

Window/wall units

• older style, self-contained through a wall or window opening

For the majority of Sydney and Brisbane homeowners installing air conditioning today, the choice comes down to split system vs ducted, with multi-split relevant in specific circumstances. Portable and window units serve a different function — temporary or low-commitment cooling — rather than being direct alternatives.

2. Split System Air Conditioners

A split system consists of two parts: an indoor wall-mounted unit that distributes conditioned air into the room, and an outdoor unit (the compressor) that handles heat exchange. They're connected by a refrigerant pipe run through the wall.

Split systems are the most installed kind of aircon in Australian homes for practical reasons. They're cost-effective to supply and install, efficient to run, and versatile enough to handle bedrooms, living areas, and open-plan spaces across a wide range of home types. Modern reverse cycle split systems both heat and cool — heating mode is typically more efficient than gas or electric resistance heating, particularly in Sydney's mild-to-cold winter conditions.

Key advantages:

• Fixed installation (no daily setup or window blockage)
• Efficient reverse cycle heating and cooling
• Individual zone control — each room has its own unit and remote
• Wide range of capacities to match different room sizes
• Works in houses, townhouses, and apartments (subject to strata rules)

Where split systems are most practical:

• Installing air conditioning in one to three specific rooms
• Properties where whole-home ducted installation is too invasive or expensive
• Rental properties where the investment needs to be proportional
• Any situation where room-by-room control is preferable to whole-home conditioning

For installation cost information, see our aircon installation cost guide. For help selecting the right size unit, see our capacity guide.

3. Ducted Systems

A ducted system uses a central fan coil unit — typically in the ceiling or under the floor — connected to a network of ducts running to individual outlets in each room. One outdoor unit serves the entire system.

Ducted air conditioning provides even conditioning throughout the home without individual wall units in each room. Zone controls allow different areas to be conditioned independently. The aesthetic is clean — only the ceiling vents are visible.

The practical reality for existing Sydney homes:Ducted installation is expensive and invasive. The ceiling cavity needs to accommodate ductwork, and gaining access to that cavity in an existing home often involves significant disruption. It's most cost-effective in new builds or major renovations where duct installation can be integrated into broader ceiling work.

For an existing home being retrofitted — the most common scenario in Sydney's established suburbs — the cost and disruption of ducted installation typically means multiple split systems are a more practical choice, particularly when only a few rooms need cooling rather than the whole home.

Where ducted systems make most sense:

• New builds where ductwork is installed before the ceiling is closed
• Whole-home conditioning where all or most rooms will be used
• Properties where aesthetics are a priority and wall units in multiple rooms are undesirable

4. Multi-Split / Multi-Head Systems

A multi-split system uses one outdoor unit connected to multiple indoor units — typically two to five. Each indoor unit serves a different room, controlled independently.

The appeal of multi-split is reducing the number of outdoor units. In apartments or properties where outdoor unit placement is constrained, running one outdoor unit to serve multiple rooms can solve a practical problem.

The trade-off:Because all indoor units share one outdoor unit, a fault with the outdoor unit affects all rooms simultaneously. Separate split systems on individual circuits are more fault-tolerant — a problem with one unit doesn't affect the others.

Multi-split systems are also generally more expensive to install than equivalent individual split systems because the outdoor unit and pipe runs need to handle multiple connections. The cost and complexity advantage narrows when more than two or three units are involved.

Where multi-split makes sense:

• Apartments with very limited outdoor unit placement options (e.g., only one approved location)
• Properties where having multiple outdoor units is specifically restricted
• When two to three rooms need conditioning and minimising outdoor units is a priority

For most Sydney houses with standard outdoor space, individual split systems are typically more practical and fault-tolerant than multi-split.

5. Which Kind Is Best for Your Home?

For most existing Sydney and Brisbane homes, a split system is the practical default — for one room, several rooms, or a combination of room sizes. Ducted is the choice for new builds or major renovations requiring whole-home conditioning. Multi-split suits specific property constraints rather than being a general preference.

Some useful questions to work through:

How many rooms need conditioning?

• One or two rooms: split systems are clear. Five or more rooms in a new build: ducted may be worth considering. Three or four rooms in an existing home: multiple split systems are usually simpler and more cost-effective than ducted.

What's your budget?

• Split systems have the lowest installation cost per unit. Ducted has a high upfront cost.

How important is aesthetics?

• Ducted is the cleanest visual option. Split systems require wall units in each room.

Do you rent or own?

• Split systems are a lower-commitment investment and more appropriate for rental properties.

Is whole-home heating important?

• Reverse cycle split systems are highly efficient heaters — often more efficient than gas heating — and work room by room.

Our service page covers what's involved in a split system supply-and-install. If you're ready to get a fixed price for your home, request a quote here.

FAQs

What is the difference between split system and ducted air conditioning?

A split system has one indoor wall unit connected to one outdoor unit, cooling or heating a single room or area. Ducted air conditioning has a central unit connected to outlets throughout the home via ceiling ductwork. Split systems are installed room by room and offer individual zone control. Ducted provides whole-home conditioning through a single system. Split systems cost less to install per zone and are more practical for existing homes; ducted is best suited to new builds or renovations.

Is portable aircon better than a split system?

Portable air conditioners require no installation — they sit on the floor and vent through a window hose. They're less efficient than split systems, noisier in operation, and less effective at maintaining consistent temperatures in larger spaces. They're suited to temporary situations or rooms where permanent installation isn't possible (e.g., rentals where modifications aren't permitted). For any permanent or long-term cooling or heating need, a reverse cycle split system is significantly more efficient and effective.

Which aircon type is best for my home?

For most existing Australian homes — houses, townhouses, and apartments — a reverse cycle split system is the most practical, efficient, and cost-effective option. Ducted is worth considering for new builds or whole-home renovation projects where ductwork can be installed with minimal disruption. Multi-split suits properties with specific outdoor unit placement constraints. If you're unsure which is right for your property, the details that matter most are: how many rooms need conditioning, whether you're in a new build or existing home, and any specific constraints around outdoor unit placement.

Looking for supply-and-install pricing on a split system for your Sydney home? Get a fixed quote here.