How Much Does Ducted Air Conditioning Cost in Australia 2026?

What Does a Ducted Air Conditioning System Cost in 2026?

A basic ducted air conditioning system costs $8,050–$16,100 fully installed in most Australian capital cities. Premium zoned ducted systems — with independent room controls and higher-capacity units — run from $12,000 to $25,000+.

These prices cover the indoor cassette or plenum unit, outdoor unit, all ducting and grilles, a zone controller, refrigerant piping, electrical connection, drainage, and commissioning. They do not include site-specific extras that can only be identified during an on-site assessment.

Basic Ducted vs Premium Zoned Ducted

A basic single-zone system conditions your entire home as one zone — you can turn it on or off but can't isolate individual rooms. These suit buyers who want whole-home coverage without room-by-room control.

A multi-zone system adds motorised dampers and a zone controller, letting you activate only occupied rooms. Zone controllers vary: simpler 6-zone units cost less; premium WiFi-connected controllers (like the Actron Neo) add $500–$1,500 to the quote. Zoning dramatically reduces running costs if your household only uses part of the home at any time.

What Drives the Cost Up?

• Internal wall pipe drop: When refrigerant lines can't run straight through an external wall, they drop inside the wall cavity. Adds $300–$800 per run.
• Extended pipe run: Longer than the standard allowance — adds $300–$800 per additional run.
• Concrete slab outdoor unit mount: Required when the outdoor unit can't sit on compacted ground. Adds ~$270.
• Multi-storey scaffolding: For upper-storey access or roof-mounted units — often $500–$2,000+ depending on height and access.
• Switchboard upgrade: Older homes may need the electrical board upgraded. Typically $800–$2,500.

Cost by State — NSW, VIC, QLD, SA, WA

Capital city labour rates are broadly similar, but regional areas vary:

• NSW/VIC (metro): Basic $8,050–$16,100; zoned $12,000–$25,000+. Peak VIC summer demand (Dec–Feb) tightens availability.
• QLD: Similar range. Far North QLD can be 10–20% higher due to reduced installer competition and higher heat loads requiring larger units.
• SA (Adelaide): Ducted very popular due to extreme summer heat. Adelaide regularly exceeds 40°C — systems must be rated for high ambient temperatures.
• WA (Perth): Evaporative cooling was historically popular in dry Perth, but reverse-cycle ducted is the modern standard for year-round comfort.

What's Included in a Good Ducted Quote?

A complete quote should itemise: indoor cassette/plenum unit with model and capacity, outdoor unit, all ductwork and grilles, zone controller, refrigerant piping, electrical connection, drainage, labour, commissioning, and compliance certificates. In Victoria, both the VBA Plumbing Compliance Certificate and the ESV Certificate of Electrical Safety should be included after installation.

Sizing a Ducted System

The 125 W/m² rule gives a starting point: multiply total conditioned floor area by 125 to get watts, divide by 1,000 for kW. Apply a diversity factor of 0.75 (not all rooms peak simultaneously). A 200m² home needs roughly an 18–20kW outdoor unit. Most 4-bedroom homes land on 14kW–20kW.

Getting an Accurate Quote

Indicative pricing is useful for budgeting, but the final installation price depends on your property. Access issues, roof space availability, and your electrical setup all affect the final number. Always get at least two written quotes for a ducted system, with full line-item breakdowns.