At a Glance
Melbourne is one of the strongest markets for ducted air conditioning in Australia. The city needs both heating and cooling, making reverse-cycle ducted the most practical whole-home climate solution. Expect $7,600–$20,900 per system, with double-brick construction and Victorian-era roof lines adding to the cost in established suburbs.
What's Included in the Price
- Supply and install of reverse-cycle outdoor compressor and indoor fan coil unit
- Ductwork fabrication and installation to AS 4254.1 Ductwork for Air-Handling Systems
- Ceiling diffusers, return air grilles, and zone dampers
- Refrigerant piping, drainage, and condensate pump if required
- Electrical connection and dedicated circuit to AS/NZS 3000 Wiring Rules
- Wall controller or smart thermostat, commissioning, and airflow balancing
- Certificate of Electrical Safety (CES) for the electrical component
In Melbourne, reverse-cycle is the default specification. The system must be sized for heating demand (not just cooling), which can mean a larger capacity unit than in warmer cities.
What Affects the Cost
- Heating and cooling capacity. Melbourne's climate demands a system sized for both 40°C summer peaks and sub-5°C winter mornings. This often means a larger unit than an equivalent home in Sydney or Brisbane would need for cooling alone.
- Double-brick construction. Common in Melbourne's eastern suburbs (Balwyn, Box Hill, Glen Waverley), double-brick walls make routing refrigerant piping and electrical cable harder than in timber-framed homes.
- Roof cavity height. Victorian-era and Edwardian homes in inner suburbs (Fitzroy, Carlton, Brunswick) often have low-pitch or complex roof lines with limited cavity space, making ductwork installation difficult.
- Zoning. Multi-zone control is particularly valuable in Melbourne where you might heat only the living areas during the day and switch to bedrooms at night. Adds 20–30% to install cost but reduces running costs.
- Existing gas ducted heating. Many Melbourne homes have gas ducted heating with existing ductwork. Converting to reverse-cycle electric may reuse some duct routes, but the ductwork itself usually needs replacing as heating-only ducts are a different specification.
- Three-phase power. Larger homes (4+ bedrooms) with systems above 12kW may need a three-phase upgrade. CitiPower and Powercor manage the supply side.
- Insulation quality. Melbourne's temperature extremes make insulation particularly important. A well-insulated home can run a smaller, cheaper system. Poor insulation means oversizing the unit and paying more to run it.
A replacement system in a single-storey, 3-bedroom timber-framed home with good roof access, existing ductwork routes, and single-zone control sits toward $7,600. A new installation in a 4-bedroom double-brick home in Balwyn with low roof pitch, 4-zone control, three-phase upgrade, and premium reverse-cycle unit pushes toward $20,900.
Melbourne-Specific Considerations
Melbourne's relationship with ducted air conditioning is shaped by its four-season climate. Unlike Sydney or Brisbane where cooling is the primary concern, Melbourne homeowners need a system that heats efficiently through winter and cools through summer. This makes reverse-cycle ducted the default choice, and it means the system must be sized for the harder job — which in Melbourne is often winter heating, not summer cooling.
The inner suburbs present the biggest installation challenges. Victorian-era terraces in Fitzroy, Carlton, and Richmond have complex roof lines with limited cavity space. Edwardian homes in Northcote and Thornbury are slightly better, but still require careful duct routing. These properties often end up with higher install costs and may need slim-line ducted units designed for tight spaces.
The eastern suburbs (Balwyn, Box Hill, Doncaster, Glen Waverley) have a different challenge: double-brick construction. The roof space is usually adequate, but running piping and cable through or around solid brick walls takes more time. Many of these homes were built in the 1960s through 1980s with gas ducted heating, so existing duct routes may provide some cost savings — though the old ductwork itself is rarely reusable.
Melbourne's growth corridors (Craigieburn, Pakenham, Tarneit, Wyndham Vale) are the easiest and cheapest suburbs for ducted installs. Newer homes are designed with ducted in mind: open roof cavities, pre-wired electrical, and modern insulation. Many builders offer ducted as a standard package or affordable upgrade.
Hiring a Licensed Air Conditioning Technician in VIC
Ducted air conditioning installation requires an ARC (Australian Refrigeration Council) authorisation for refrigerant handling, and the electrical component must be completed by an electrician registered with Energy Safe Victoria. The electrician must issue a Certificate of Electrical Safety (CES) and lodge it with ESV.
Verify both credentials before work begins. You can check ARC authorisation on the ARCtick website and electrical licences on the ESV website. A reputable installer will conduct an on-site inspection — measuring roof cavity clearance, checking insulation, assessing electrical capacity, and discussing zoning — before providing a quote. Reject any quote given without a site visit.
Melbourne has a competitive installer market, so get at least three quotes. Ask each installer to specify the unit brand, model, capacity (kW), number of zones, and what is included in warranty coverage. Compare on total system value, not just price.
How We Calculate
Estimates are based on surveyed trade rates for licensed air conditioning technicians in metropolitan Melbourne, adjusted for property type and construction era. All prices include GST. Figures cover standard residential ducted air conditioning systems. Commercial and industrial installations are excluded.