Ducted Air Conditioning Sydney
Before a duct goes in
find out what’s already in the ceiling.
Standby designs and installs reverse-cycle ducted air conditioning for Sydney homes, starting with the roof space it has to live in.

Is ducted right for your Sydney home?
Ducted suits a house where you want most rooms cooled and heated from one system, with nothing on the walls but a controller. It needs a ceiling cavity with the height and access for the indoor unit and the duct runs, which most detached Sydney homes with a pitched roof have. Terraces, flat roofs and apartments usually suit split systems better.
In Sydney, ducted is usually a retrofit into a ceiling that has been there for decades. That makes the roof space the first thing we look at, before we talk about capacity or brands. If you are still weighing it up, our guide to choosing between ducted or split system air conditioning sets out the trade-offs.
What’s already in a Sydney ceiling
Between 1968 and 1979, some Sydney homes had loose-fill asbestos insulation blown into their ceilings. The NSW Government identified the council areas where it is more likely to turn up in homes built before 1980 and six of them are in Sydney: Hornsby, Ku-ring-gai, The Hills, Parramatta, North Sydney and Canterbury-Bankstown. Wollongong is not one of them.
It matters more for ducted than for any other air conditioner. A ducted install means working through the whole cavity, lifting batts and cutting in outlets and a return air grille and then the system moves the house’s air through that space every day. NSW advice is plain: if loose-fill asbestos is suspected, do not enter or work in the ceiling.
It is also easy to miss. In April 2016 a 1950s home in Asquith tested positive during the NSW testing program and the loose fill was sitting under insulation batts added years later, so a normal look into the roof had not found it.
So for a pre-1980 home in those areas, search the address on the NSW loose-fill asbestos insulation register before the site visit. When we inspect the roof space we look under the batts, not just across them. If there is loose, fluffy fill underneath, nobody should work in that ceiling until a licensed asbestos assessor has checked it and that includes us. Most homes are clear and then the job goes ahead as normal.
Townhouses and villas: approval first
In a strata townhouse or villa, the NSW Government lists installing a reverse-cycle air conditioner as a renovation that needs the owners corporation’s approval and ducting in a shared roof space may need a by-law as well. Across the Hills and Parramatta, where a lot of newer housing is strata, that approval is the first step. Our apartment air conditioning page covers how strata approval works.
How a Sydney ducted install runs
Site visit and roof space check
We measure the rooms, check the cavity height, access and switchboard and on an older home confirm the house’s age and look under the batts.
Zone design and sizing
We size the system for the house and split it into zones so living areas and bedrooms run on their own. Two-storey homes often need bulkheads for the upstairs or a separate system.
Fixed quote
One fixed price for the whole job. Eligible upgrades have the NSW Government discount taken off the quote.
Install and commissioning
A Certificate 3 qualified crew installs the indoor unit, ductwork, outlets and outdoor unit, then commissions and balances the system. In a strata roof void, work starts only once approval is in hand.
Handover and first-year maintenance
We walk you through the zones and the wall controller, hand over the certificates and put the two first-year services in the diary. Keep the return air filter clean between them.
When the ceiling is already open
The easiest time to put in ducted is before the plasterboard goes up. If you are planning a knock-down rebuild, an extension or a second storey, talk to us early and the ducting goes into a new ceiling instead of an old one. Builders can read how we work with them on our builders page.
Where we install ducted air conditioning in Sydney
Standby is based in the Illawarra and comes into Sydney on the M1 and the M5. We install ducted systems across Sydney metro, from the Sutherland Shire and St George to Canterbury-Bankstown, Parramatta, the Hills and the North Shore along the Pacific Highway. For split systems and single rooms, see air conditioning installation in Sydney. If you already have ducted and it has stopped working, see ducted air conditioning repair.
The NSW Government discount
Standby is an NSW Government rebate installer. When an upgrade is eligible, the discount comes off the quote itself. Not every ducted system qualifies, so we check yours against the rules before we quote. The details are on our NSW air conditioning rebate page.
Qualified and insured
- Certificate 3 trade qualified tradesmen
- ARC member with a refrigerant purchasing licence
- NSW Government rebate installer
- $20M public liability insurance
Sydney ducted questions
My house was built before 1980 in Hornsby, Ku-ring-gai or the Hills. Can we still put in ducted?
Usually, yes. Search the address on the NSW loose-fill asbestos insulation register first. At the site visit we look under the batts, not just across the top of them. If there is loose, fluffy fill under there, nobody should work in that ceiling until a licensed asbestos assessor has checked it and that includes us.
Do I need strata approval for ducted air conditioning in a Sydney townhouse?
Yes. The NSW Government lists installing a reverse-cycle air conditioner as a renovation that needs owners corporation approval and work in a shared roof space may also need a by-law. Get the approval before the site visit turns into an install date.
What are the disadvantages of ducted air conditioning?
It needs a usable ceiling cavity, it takes longer and costs more to install than one or two split systems and it uses more power than it should if every zone runs all the time. The filters and return air grille also need regular cleaning. For a whole house with the roof space to take it, most people find it worth it.
How much does ducted air conditioning cost in Sydney?
A ducted job in Sydney is priced on the house: floor area, how many zones, duct lengths, how much room there is to work in the ceiling, the board and whether an older ceiling needs an asbestos check first. After the roof space inspection you get one fixed figure.
Can a ducted system run late at night under the NSW noise rules?
Yes, as long as the outdoor unit cannot be heard inside a neighbour’s home during the restricted hours overnight. Since 28 August 2026 the evening restriction has started at 11pm and it lifts during severe or extreme heatwaves declared by the Bureau of Meteorology. We place the outdoor unit with that in mind.
Related pages
Ducted, planned from the ceiling down
Reverse-cycle ducted systems for Sydney homes, designed around the roof space you actually have.