Ducted Aircon Cost Sydney

What ducted really costs in Sydney — by home size, zones and brand tier.

Ducted air conditioning is the largest comfort purchase most homeowners make, and the quoted range online is uselessly wide. This guide narrows it down: what a ducted system costs by home size in Sydney, how zone count and brand tier change the number, which site conditions add thousands, and how the running cost compares with running several splits.

Quick answer

Ducted air conditioning in Sydney costs $8,000–$11,500 for a typical 3-bedroom home with 3–4 zones, $11,500–$15,000 for a 4-bedroom home, and $15,000–$22,000 for large or two-storey homes with 7+ zones and premium brands. Installation takes one to two days. Zoning adds upfront cost and pays it back in running savings.

Key takeaways

  • 3-bedroom homes: $8,000–$11,500 installed with 3–4 zones
  • 4–5 bedroom homes: $11,500–$18,000 with 5–8 zones
  • Two-storey and slate or tile roofs add labour and access cost
  • Each additional zone typically adds $600–$1,200
  • Premium brands add 15–25% upfront and return it in quiet running and efficiency

Ducted cost by home size

Capacity is driven by conditioned floor area, ceiling height, glazing and orientation, and capacity drives the equipment price. As a rough guide, a 3-bedroom single-storey home needs 10–14kW, a 4-bedroom home 14–18kW, and a large or two-storey home 18–25kW, sometimes split across two systems.

What adds cost to a ducted quote

  • Number of zones and whether you want individual room control
  • Two-storey layouts requiring bulkheads, risers or a second system
  • Tile, slate or metal roofs, and tight or low roof cavities
  • Switchboard or supply upgrades to handle the load
  • Premium brand tier and smart zone controllers with app scheduling
  • Long duct runs to distant rooms or additions
  • Crane or scaffold hire for difficult outdoor unit placement

Is zoning worth paying for?

Almost always. Zoning costs money upfront and saves it every day. Conditioning four bedrooms you are not in, all afternoon, is the single most expensive way to run a ducted system. A sensible plan — living areas as one zone, bedrooms split into two or three — is the best value version. Individual room control is a comfort upgrade more than an efficiency one.

Ducted versus multiple splits on total cost

Four splits to cover four rooms lands around $7,000–$11,000 and leaves four outdoor units, four wall boxes and four remotes. Ducted at $8,000–$11,500 gives one hidden system, one controller and a better look, but higher running cost if it is poorly zoned. Below three rooms splits win on cost; at four or more, ducted becomes the better long-run buy for most homes.

Ducted air conditioning cost in Sydney (2026)

Fully installed pricing including ducting, vents, zoning, electrical connection and commissioning.

ItemTypical price
2-bedroom apartment or unit, 2–3 zones$7,500 – $9,500
3-bedroom single storey, 3–4 zones$8,000 – $11,500
4-bedroom single storey, 4–6 zones$11,500 – $15,000
4–5 bedroom two storey, 6–8 zones$14,000 – $19,000
Large home, 8–10 zones or dual systems$18,000 – $26,000
Each additional zone$600 – $1,200
Smart Wi-Fi zone controller upgrade$450 – $1,200
Indoor and outdoor unit swap, existing ducts reused$6,000 – $9,500

Includes GST. Final price follows an on-site assessment of roof access, electrical capacity and duct routing — we quote a fixed figure, not an estimate.

Frequently asked questions

Why do ducted quotes vary so much between companies?

Capacity assumptions, zone counts, duct quality and what is excluded. Some quotes assume fewer zones or thinner ducting, or leave out electrical work and rubbish removal. Compare kilowatts, zone count, duct R-value and inclusions, not just the total.

How much does ducted air conditioning add to running costs?

An unzoned ducted system can cost $1.00–$2.50 an hour to run in peak heat. Well-zoned and set to 24–25°C, most Sydney homes see $0.60–$1.40 an hour. Zoning is where the savings live.

Can I add ducted to a home without much roof space?

Sometimes, using slimline fan coils, under-floor installation or bulkheads. Where it genuinely will not fit, a multi-split is the practical alternative and we will say so at the quote.

Is finance available on ducted systems?

Yes — interest-free plans through major Australian lenders, approved quickly, which is how most of our ducted customers spread the cost.

Ducted Air Conditioning Installation by Sydney suburb

Local licensed technicians for ducted air conditioning installation right across Sydney — from the CBD and Eastern Suburbs to the Hills, the Shire, the Northern Beaches and Western Sydney. Pick your suburb for local pricing, availability and job examples.

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Get a quote

Free on-site quotes across Sydney — call iNext Air Conditioning on 0426 499 802.