Split system or ducted air conditioning for a Byron Bay home?

For most Byron Bay cottages, units and townhouses, one or two wall splits in the rooms you actually use is the cheaper and simpler choice. Ducted makes sense in a larger house with a usable roof space where you want every room conditioned from one controller, and a multi-split sits between the two when you want several rooms but have no room for ducts or only one spot for an outdoor unit.

The right answer depends on the house, so the installer you choose should look at the roof, the walls and the switchboard before recommending one. Providers who quote through this site are independent local businesses, and each will give its own advice.

What is the difference between split, multi-split and ducted?

The NSW Government guide to reverse-cycle air conditioners describes three types:

• Split system: a single wall head inside connected to its own box outside, used to heat or cool one room.
• Multi-split: one outdoor unit running several indoor units, useful where ducting is not practical.
• Ducted: a central unit that controls the temperature through the building, suited to a whole home or business.

All three are reverse cycle, so they heat in winter as well as cool in summer. On a humid coastal day the dry mode on any of them pulls moisture out of the air without dropping the temperature too far.

How do split and ducted compare side by side?

Factor	Wall split	Multi-split	Ducted
Published Byron Bay range	$1,900 to $3,675 for a 5 kW unit	$4,200 to $7,900 for 2 heads	$8,400 to $14,700 basic, $12,600 to $23,100 zoned
Rooms covered	One room or open-plan area per unit	Two or more rooms from one outdoor unit	Whole house through ceiling vents
Needs roof space	No	No	Yes, with enough height to move around and fit ducts
Visible inside	Wall head in each room	Wall head in each room	Ceiling vents and a return air grille
Outdoor units	One per indoor unit	One shared	One, usually larger
Zoning	Each unit is its own zone	Each head runs on its own	Needs a zoned system and motorised dampers
If one part fails	Other rooms keep running	A fault in the outdoor unit stops every head	The whole house can lose cooling
Running only one room	Efficient, only that unit runs	Efficient enough	Wasteful unless zones close off the rest
Install disruption	A few hours per unit	About a day for two heads	Usually several days with roof work

Price ranges are GST inclusive bands from a published Byron Bay guide, not quotes. The full set of bands, including servicing and repairs, is on the air conditioning cost page.

Which suits a beach cottage?

Older timber and weatherboard cottages close to the sand are often raised, with low ceiling cavities and walls that open straight onto a verandah. That usually rules out ducts and favours one wall split in the main living space plus a smaller one in the main bedroom. Each outdoor unit can then go on the sheltered side of the house, away from the direct onshore breeze, which helps the coil last in salty air.

A cottage owner who wants three or four rooms done but only has one sensible spot for an outdoor unit, say a narrow side passage, is the classic case for a multi-split. The multi-split systems page explains how the heads and pipe runs are planned.

Which suits a townhouse or unit?

Townhouses and units usually have limited outdoor space, a small balcony or a shared wall, and in a strata building the owners corporation may have by-laws about where external units can go. A single split in the living area, or a two-head multi-split, is the common answer. Ducted is rare here because there is seldom a roof cavity that belongs to one lot. Check the by-laws and get any approval in writing before you book an installer.

Which suits a hinterland house?

A bigger family home out around Bangalow, Ewingsdale or the Mullumbimby hills, with four or more bedrooms, a pitched metal roof and decent roof space, is where ducted earns its price. One controller handles the whole house, the vents are discreet, and zoning lets you shut off guest rooms or the living area at night. The trade-off is a much larger upfront cost, a single outdoor unit that everything depends on, and roof work that takes several days.

If the house is long and low with rooms spread across separate wings, two or three splits can still beat ducted on cost and running efficiency. The ducted air conditioning page covers what an installer checks in the roof before committing to a design.

How do the options compare on noise and looks?

• Inside noise: a ducted indoor unit sits in the roof, so the room hears only air through the vents. Wall splits have a fan you can hear on the higher speeds, though modern units are quiet on low.
• Outside noise: splits spread the sound across several smaller outdoor units, while ducted has one bigger unit. Think about where a neighbour’s bedroom window is before choosing a spot.
• Looks: some owners of character cottages dislike wall heads on painted timber boards. A floor console or ceiling cassette can be an option on some split ranges.

How do they compare on running cost?

What drives running cost is how many rooms you condition and for how long. A split in the one room you use most will cost less to run than ducted cooling the whole house. Ducted without zoning is the most wasteful option for a household that spends evenings in one room.

Whichever type you choose, the state energy advice is the same: three stars or better, and between two equal-rated units of the same capacity, the lower yearly kWh figure wins. It holds for a bedroom split as much as for a ducted plant.

Ducted systems also lose some energy through the ducts themselves, especially where ducts run through a hot roof space under dark metal sheeting. Well insulated ducts, short runs and sealed joints all help, and a careful installer will check them on an existing system before blaming the outdoor unit. A wall split has no ducts, so it avoids that loss entirely.

How do they cope with salt air?

Outdoor units within a short walk of the surf take the worst of the salt. With splits, each outdoor unit can be put in a sheltered spot and replaced on its own when it wears out. With ducted, one larger outdoor unit carries the whole house, so its position and coil protection matter more. Either way, ask the installer about coastal-rated coils and a regular wash-down service.

Can you mix the options?

Yes. A common Byron Bay pattern is ducted for the main house and a separate wall split in a studio, granny flat or holiday-let wing so it can run on its own. Another is starting with one split now and adding a second later. Mixing means more than one outdoor unit and more than one service visit each year, so weigh that against the flexibility.

Is the size question the same for all three?

The capacity in kW still has to suit the space, whichever system you pick. A ducted system is sized for the whole conditioned area, a split for its own room. The air conditioner size guide covers the factors an installer weighs, and the split system installation page shows what happens on the day a wall unit goes in.

If you are torn between two options, you can request a split or ducted comparison quote and ask the provider to price both.

Next step

When you send a split or ducted enquiry, list the rooms you want cooled and how big each one is, say whether the house is a cottage, townhouse or larger home, and include a photo of the manhole or roof space if ducted is on the table. Note whether the house is strata, and where you think an outdoor unit could sit.

Send a job enquiry