If you are choosing between ducted and split system air conditioning for a Mackay home, the honest answer is that neither one wins outright. Ducted air conditioning cools the whole house from one hidden system and costs roughly $9,000 to $20,000 installed. A split system cools one room or zone for a fraction of that. In a tropical climate where you run cooling for most of the year, the deciding factors are how many rooms you actually use at once, how efficiently each option runs, and whether you can pair it with rooftop solar so the sun pays for the cooling. Here is the straight comparison.
The short version
Ducted suits whole-house cooling and larger homes that want every room comfortable with the hardware out of sight. Split systems suit cooling the rooms you actually use, cost far less upfront, and are the easiest way to run cooling off your own solar during the day. Because air conditioning in Mackay is mostly a daytime and evening load, the biggest saving for either system comes from a high cooling star rating and from self-consuming your solar rather than buying that power back from the grid.
Ducted vs split: what each one is
A ducted system is one large indoor unit, usually sitting in the roof space, pushing cooled air through insulated ducts to vents in every room. Zoning dampers let you open or close areas. One system, one main controller, whole house.
A split system is an outdoor compressor paired with one indoor head on a wall. Each unit cools one room or open area. Multi-head splits run several indoor heads off a single outdoor unit.
Both are almost always reverse-cycle, cooling in summer and heating in the cooler months from the same box.
What ducted air conditioning costs to install
Ducted is the bigger job. Canstar Blue puts a ducted install at roughly $9,000 to $20,000, driven mostly by home size and the number of zones.
| Home size | Typical ducted install (Canstar Blue) |
|---|---|
| Small single-storey, 2 to 3 bedrooms | $9,000 to $11,500 |
| Medium single-storey, 3 to 5 bedrooms | $12,000 to $14,500 |
| Large multi-storey, 4 to 6 bedrooms | $15,000 to $20,000 |
A single split system is a much smaller job. Canstar puts split installation at roughly $600 to $1,500, with the unit itself on top, so cooling one living area costs a small fraction of a whole-house ducted system. You can put splits in several rooms for the price of one ducted system.
Ducted vs split at a glance
| Factor | Ducted | Split system |
|---|---|---|
| Upfront cost | $9,000 to $20,000 installed, whole home | Much lower. Install from about $600 to $1,500 plus the unit, per room |
| What it cools | Every connected room from one system | One room or open zone per indoor head |
| Zoning | Zone dampers, but you still run one central unit | True room-by-room. Cool only where people are |
| Running cost control | Harder to run cheaply if you use only a room or two | Easy. Run just the rooms in use |
| Solar friendliness | Runs on solar, but the whole-house load is larger | Excellent. A small daytime load a rooftop system covers easily |
| Maintenance | More components and ductwork to service and keep clean | Simple. Clean filters, periodic service per head |
| Appearance | Hidden. Only the vents show | Visible indoor heads on walls |
| Best for | Larger homes wanting even, whole-house comfort | Cooling the rooms you actually use, and pairing with solar |
Running cost and the star rating that matters in the tropics
Cooling is where Mackay households spend. Canstar Blue estimates ducted cooling runs an average household between $384 and $1,964 a year, depending on the climate zone. In a tropical climate you cool for most of the year, so the single most valuable number on the sticker is the cooling efficiency.
Australian air conditioners carry the Zoned Energy Rating Label under the Greenhouse and Energy Minimum Standards (GEMS). It rates seasonal efficiency separately for three climate zones, hot, average and cold, and shows the estimated annual energy use in kilowatt hours for heating and cooling in each zone. The hot zone covers the northern third of Australia, which takes in tropical Queensland. So for a Mackay home the number to compare is the hot zone cooling rating, the blue cooling stars, not a single averaged figure. As SolarQuotes puts it, in the hotter northern parts of Australia cooling efficiency is the rating that matters. A higher cooling star rating directly lowers what you pay to run the system, whichever type you choose.
The Mackay angle: run your air conditioning on your solar
This is the part most quotes skip. Air conditioning is largely a daytime load, and daytime is exactly when your rooftop solar is producing. Every kilowatt hour of cooling you run off your own panels is power you did not buy from the grid, and in Queensland you buy grid power for far more than you are paid to export surplus solar. That makes a unit of self-consumed cooling worth several times more than a unit you export. So the cheapest air conditioning to run is the one sized to sit under your solar production through the hot part of the day.
This is where split systems have the edge for a lot of homes. A couple of well-sized splits cooling the rooms you use is a modest daytime load that a typical rooftop system covers comfortably, so the sun does the paying. A whole-house ducted system runs on solar too, it is simply a bigger load to cover, which usually means a larger array or a battery to carry the cooling into the evening.
Next Phase Solar installs air conditioning across Daikin, Mitsubishi Electric, Mitsubishi Heavy Industries and Haier, and holds air conditioning licence ARC L100729. Because the same local team handles your solar, switchboard and cooling, we size the air conditioning against your actual solar production and confirm the switchboard can carry it in the one visit, rather than treating it as a separate job. If solar is still on your list, start with is solar worth it and how much solar panels cost.
When ducted makes sense, and when split wins
Choose ducted when you have a larger home, you want even comfort in every room, you value hiding the hardware, and you genuinely cool most of the house at once. It is the tidy, whole-house answer that tends to lift resale appeal.
Choose split when you mostly cool the rooms you are in, want the lowest upfront cost, or want the simplest way to run cooling off your solar. For a bedroom, a home office, a main living area, or a site office or crib room, a split does the job for a fraction of the outlay and gives you true room-by-room control. Plenty of Mackay homes land on a mix: splits in the bedrooms and living area, and they never miss the ducting.
Frequently asked questions
How much does ducted air conditioning cost in Australia?
Roughly $9,000 to $20,000 installed, according to Canstar Blue, depending on the size of the home and the number of zones. A small single-storey home sits around $9,000 to $11,500, a medium home around $12,000 to $14,500, and a large multi-storey home around $15,000 to $20,000. A single split system is far cheaper, with installation from about $600 to $1,500 plus the unit itself.
Is ducted or split cheaper to run in a tropical climate?
It depends on how much of the house you cool. If you cool the whole home at once, a well-rated ducted system is efficient. If you use only a few rooms, splits are cheaper because you cool only where people are. Either way, compare the hot zone cooling stars on the Zoned Energy Rating Label, and run the system on your solar during the day to cut the bill further.
Can I run ducted or split air conditioning on solar?
Yes, both. Air conditioning is mostly a daytime load, so it pairs naturally with rooftop solar. Splits are the easiest match because a couple of units make a small load your solar covers easily. A whole-house ducted system draws more, so it may want a larger array or a battery to carry the evening cooling.
Which brands and licence does Next Phase Solar install?
We install Daikin, Mitsubishi Electric, Mitsubishi Heavy Industries and Haier, and we hold air conditioning licence ARC L100729. We size and install cooling alongside your solar and switchboard so it runs on your own power wherever possible.
Sources
- Ducted install cost by home size, and the cooling running cost range: Canstar Blue, Ducted air conditioning cost
- Split system installation cost: Canstar Blue, Air conditioner installation cost and Canstar, Split system air conditioner installation cost
- Why cooling efficiency is the rating that matters in northern Australia, and how the Zoned Energy Rating Label works: SolarQuotes, The air con efficiency rating you should really care about
- The Zoned Energy Rating Label and the Greenhouse and Energy Minimum Standards (GEMS) framework: Australian Government Energy Rating scheme (energyrating.gov.au), cited by name as the site blocked automated retrieval.
Whether you land on ducted, split, or a mix, the smartest move in Mackay is to size the cooling around your solar so the sun runs it. See our air conditioning service or get a straight, no-pressure quote.
Book an on-site air conditioning assessment at /quote/
Last reviewed July 2026.
