Ducted reverse-cycle air conditioning cost guide

What ducted reverse-cycle actually costs installed

CHOICE's published guidance is the clearest single reference point: a small home rarely gets a ducted reverse-cycle system installed for under $5,000, a standard freestanding house commonly sits at $10,000 or more, and a large or multi-storey home often runs $15,000-plus. Canstar Blue's more detailed breakdown lands in the same territory but ties the bands more directly to home size and storeys: roughly $9,000 to $11,500 for a small, single-storey two-to-three-bedroom home, $12,000 to $14,500 for a medium single-storey three-to-five-bedroom home, and $15,000 to $20,000 for a large, multi-storey four-to-six-bedroom home. [1][2]

Those two sources are not contradicting each other so much as describing the same range from slightly different starting points. CHOICE's figure is the entry point across all ducted jobs nationally; Canstar Blue's is broken out by property size and storeys, which is why its 'small home' band sits a little higher than CHOICE's absolute floor. Read together, they say the same thing: a modest single-storey retrofit is realistically a five-figure job starting around $9,000 to $11,000, and a large, zoned, multi-storey home can reasonably run to $20,000. [1][2]

Daikin's ducted range is the product side of this equation: a single outdoor unit connected to a network of indoor ductwork and zoned outlets delivering reverse-cycle heating and cooling throughout the home from one system, rather than room by room. The equipment itself scales with the size of the home and the number of zones it needs to serve, which is the main reason the price range is as wide as it is. [3]

It is worth being clear about what sits inside a ducted quote versus what does not. A properly scoped quote should cover the outdoor unit, the indoor fan coil, all ductwork whether new or partially reused, the zone control system, thermostats or a wall controller, and commissioning of every outlet, rather than a base figure that assumes everything goes smoothly and adds surprises afterward. Asking specifically what is and is not included is as important on a ducted quote as it is on a split system one, arguably more so given the higher total dollar figure involved. [3]

Single-storey vs double-storey: why the second level changes the number

Canstar Blue's figures show the jump plainly: large, multi-storey homes sit at $15,000 to $20,000, meaningfully above the $9,000 to $14,500 range covering single-storey homes of comparable bedroom count. A second storey adds duct runs that have to travel between floor cavities or through a roof space that was not designed with ducting in mind, more complex zoning to keep upstairs and downstairs comfortable independently, and often more difficult access for the installation crew throughout the job. [2]

It is not simply that a double-storey home is bigger, floor area on its own already pushes a quote up through Canstar Blue's small-to-medium-to-large bands. The storey premium sits on top of that, because running ductwork vertically between levels and achieving good airflow to upstairs bedrooms typically requires more ducting, more careful design, and more installation time than the equivalent floor area spread across a single level. [2]

Outdoor unit placement is a related, often underestimated factor on double-storey homes. Finding a location that keeps refrigerant line lengths reasonable for both levels, sits within Daikin's specified operating limits, and does not create a noise nuisance near a bedroom window takes more planning on a two-storey home than a single-storey one, and getting it wrong adds cost later even if it looks fine on installation day. [3]

New ductwork vs reusing what is already there

On a replacement job, existing ductwork is often the single biggest variable in the final price, and it is not one that can be answered honestly over the phone. Hyde's dedicated guide on whether existing ducts can be reused in a ducted replacement covers this properly: reuse is genuinely possible when the old duct layout, insulation condition, and room groupings still suit the way the home is used, but promising reuse before inspection risks locking in the exact airflow and zoning problems the replacement was meant to fix. [3]

Where existing ducts cannot be reused, new ductwork adds materially to the job, additional material, more time in the ceiling or underfloor space, and often more zone dampers if the new design improves on the old room groupings, and that additional scope is exactly the kind of thing that separates a $10,000 quote from a $14,000 one for what looks like a similarly sized home on paper. A proper on-site inspection before quoting is the only reliable way to know which side of that gap a specific job sits on. [3]

There is a middle option worth asking about too: partial reuse, where sound sections of existing ductwork stay in place and only the parts that are undersized, poorly insulated, or serving the wrong room groupings are replaced. It is not always cheaper than a full replacement once the labour of working around old and new ductwork together is factored in, but on a home with genuinely good bones in its original duct layout it can bring the total closer to the lower end of the range without compromising the result. [3]

What zoning adds, and what it buys back

Zoning splits a ducted system into independently controlled areas, so bedrooms can be held at a different temperature to living areas, or an unused wing of the house can be shut off entirely rather than conditioned along with everywhere else. Daikin's own explanation of ducted zoning describes it as achieved through motorised dampers in the duct network controlled from a central panel or app, and that additional hardware, dampers, wiring, and a zone controller, is what adds to the installed price relative to a single, unzoned ducted system. [4][5]

The honest way to think about zoning cost is as a modest, genuinely worthwhile increment on top of the base installed price rather than a separate budget line with a fixed national figure, because the number of zones a given home actually needs depends entirely on its layout and how the household lives in it. What zoning buys back is real: only conditioning occupied areas rather than the whole footprint every time the system runs is one of the most effective ways to bring the running-cost gap between ducted and a well-zoned multi-split closer together. [4][5]

How many zones a home actually needs is a design question rather than an upsell to be resisted. Bedrooms that keep different hours to living areas, a home office used through the day while the rest of the house sits empty, and a rarely used guest wing are all genuine candidates for their own zone, and Hyde's guide on zoning strategy by floorplan goes through how that gets decided room by room rather than as a flat number applied to every house regardless of layout. [4][5]

Running cost vs the alternatives

Sustainability Victoria's modelling for an average pre-2005 Melbourne-climate home puts a 2.5-star ducted reverse-cycle system at around $721 a year to heat a small, 100-square-metre home, noticeably higher than the roughly $513 a year the same modelling attributes to a 2.5-star multi-split covering the same floor area. Ducted systems condition a larger, more connected volume of air by design, which is part of the point, whole-home comfort rather than room-by-room, but it is also why disciplined zoning matters so much to keeping the running-cost gap manageable. [6]

A higher star-rated ducted system narrows that gap, and good zoning discipline narrows it further, because a well-zoned ducted system that only conditions occupied rooms behaves much closer to a multi-split on the power bill than an unzoned system running the whole ducted network for every hour it is on. The efficiency rating and the zoning strategy matter more to the ongoing cost than the brand name on the outdoor unit. [6]

Hyde's guide on how zoning reduces running costs in ducted air conditioning sets out this relationship in more detail, including how much of the running-cost outcome is actually decided by how the system is used day to day rather than by the equipment alone. A well-specified ducted system that is run unzoned, every outlet open, every hour it is on, will not deliver the running-cost benefit the equipment is capable of, which is a genuinely common gap between a system's potential and its actual bill. [6]

The VEU discount and how it changes the maths

For Peninsula homes still running gas ducted heating, the Victorian Energy Upgrades program is the single biggest factor that can move the effective cost of a ducted reverse-cycle switch. Energy Victoria's own published example puts the discount at up to $5,530 for removing or replacing an existing gas ducted heater with an efficient reverse-cycle system, applied as a discount on the invoice rather than a rebate claimed after the fact, though the actual figure on any given job depends on the specific upgrade path, the equipment installed, and current certificate pricing. [7]

Hyde's VEU rebates explained guide sets out how the scheme actually works in full, including who is eligible, how the discount reaches the invoice, and the traps that catch homeowners expecting a simpler government cheque. The practical point for a ducted cost conversation is narrower: VEU is worth factoring into the timing of a gas-to-reverse-cycle switch, because it can bring the effective cost of the larger end of the ducted range meaningfully closer to the smaller end, but it should never be the reason a home chooses a system that would not otherwise be the right fit. [7]

It is worth being direct about what VEU does not do. It does not reduce the cost of upsizing beyond what the home actually needs, it does not apply to every heating and cooling upgrade equally, and the exact discount depends on certificate pricing at the time of the transaction rather than a fixed figure every household can bank on in advance. Treating the up-to-$5,530 example as a floor rather than a ceiling is the most common way homeowners end up disappointed by a smaller discount than they expected. [7]

Why Peninsula quotes vary house to house

Coastal exposure adds a genuine, if often overlooked, factor to Peninsula ducted quotes. Outdoor units in salt-air locations benefit from corrosion-resistant coil coatings and hardware, and factoring that into the equipment selection from the start is cheaper than dealing with accelerated corrosion on a standard unit a few years into an exposed foreshore position. As a Daikin specialist dealer, Hyde builds that consideration into quotes for the Peninsula's coastal suburbs rather than treating every home as if it sits equally far from the water. [3]

Roof space access is the other Peninsula-specific variable that rarely shows up in a national cost guide. Established homes with low-pitch roofs, limited crawl space, or awkward truss layouts take longer to run ductwork through than a new-build roof space designed with services in mind, and that access difficulty is exactly the kind of site-specific detail that only becomes clear once someone has actually been up in the roof, not from a floor plan or a phone description. [1][2]

The Peninsula's mix of housing stock adds a third layer on top of coastal exposure and roof access: 1970s beach houses, fully renovated new builds, and part-time holiday properties sit within a few streets of each other in a lot of Peninsula suburbs, and each brings a different starting point to a ducted quote, existing insulation, ceiling height, prior renovation work, and how much of the roof space has already been used for other services. A quote that treats every Peninsula home as generically similar is missing exactly the detail that determines where a specific job actually lands. [1][2]

Occupancy pattern is worth factoring in too, even though it rarely shows up on a cost breakdown. A permanently occupied family home and a part-time holiday property of similar size may quote at a similar installed price, but the running-cost and zoning conversation that follows the install can look quite different, since a holiday property's usage pattern, empty for stretches then fully occupied, benefits from a different zoning strategy to a home that is lived in every day. [6]

Getting a number that means something

Every figure in this guide is genuine published Australian pricing guidance, and it is genuinely useful for setting a realistic budget range before the first quote arrives. It is not, on its own, a quote for a specific home, because storeys, ductwork condition, zoning needs, coastal exposure, and roof access all move a real job around inside that range in ways a national average cannot capture. [1][2]

As a Daikin specialist dealer, Hyde is trained to size and design the ductwork and zoning correctly for the site rather than fitting equipment to a generic template, which is what separates a ducted system that runs quietly and cheaply for its working life from one that struggles and costs more to run than it should. That design work is done as part of the quoting process, not bolted on after the equipment has already been chosen. [3]

Hyde provides free on-site quotes for ducted reverse-cycle installations across the Mornington Peninsula, assessing the roof space, the existing ductwork, and the zoning the home actually needs before putting a firm number in writing, and factoring in whatever VEU discount the specific upgrade path qualifies for at the time. That is the difference between a published range and an accurate, actionable number for a particular house. [7]

For households comparing a ducted upgrade against a split or multi-split alternative, it is worth having both quotes in hand before deciding, since the two systems solve genuinely different problems at genuinely different price points, and the right answer depends as much on how the home is used as on the numbers themselves. [1]