Why Homeowners Are Making the Switch, What the Changeover Involves and What to Expect on Cost and Timing
TL;DR: Switching from evaporative cooling to refrigerated ducted air conditioning gives you reliable cooling on humid days, sealed-home comfort and, with a reverse cycle system, heating as well. Existing evaporative ducts cannot be reused, so the changeover is a full new installation. Most homes move from inspection to a working system within a few weeks.
Why Are Melbourne Homeowners Switching From Evaporative Cooling?
Melbourne homeowners are switching because evaporative cooling struggles on humid and extremely hot days, needs open windows and provides no heating. A refrigerated system cools reliably in all conditions and, in reverse cycle form, heats the home too.
Evaporative cooling in Melbourne works well on hot, dry days. A roof-mounted unit draws outside air through water-soaked pads, cooling it as the water evaporates. The limits become clear in Melbourne’s changeable summers:
- Humid days: Evaporation slows when the air is already moist, so cooling performance drops just when you need it.
- Melbourne heatwaves: During extended heat, an evaporative cooler often cannot bring indoor temperatures down far enough for comfortable sleep.
- Open windows: The system needs windows or doors partly open to let air escape, which affects security, noise and dust.
- No heating: Evaporative coolers only cool, so most homes also run a separate gas ducted heater.
A refrigerated ducted system is a sealed system. It recirculates and conditions indoor air, controls humidity and, as a reverse cycle system, provides year-round heating and cooling. In climate zone 6, with cold winters and hot summers, one system covering both seasons makes a strong case. Our guide to ducted air conditioning and indoor air quality explains the air quality benefits of a sealed system.
Can You Reuse Your Existing Evaporative Ducts?
No. Evaporative ducts are designed for a completely different type of system, so a switch to refrigerated ducted air conditioning requires a full new installation, including ductwork.
This is the most common question we hear about evaporative cooling replacement in Melbourne. The reasons are practical:
- Insulation and condensation risk: Evaporative ducts carry moist, mildly cooled air and are often uninsulated or lightly insulated. Refrigerated air is much colder, and running it through these ducts causes condensation that can drip onto ceilings and lead to water damage and mould.
- Different pressure profile: Evaporative systems move very large volumes of air at low pressure. Refrigerated systems run at different pressures and airflow rates, so the old duct sizes do not match.
- No return air system: Evaporative coolers push air out through open windows. A refrigerated system needs a return air grille and return path to draw air back to the indoor unit.
- Different equipment: A refrigerated system needs an indoor unit in the roof cavity, an outdoor compressor and refrigerant piping between them.
A complete installation includes new insulated ductwork, an indoor unit, an outdoor compressor, refrigerant piping, ceiling vents and a return air grille. Shortcuts that work around this duct incompatibility risk damage and poor performance, so King & Sons replaces everything.
What Does the Changeover Process Involve?
The changeover follows a clear sequence, from site inspection to commissioning and handover. Each step is completed by licensed technicians.
- Site inspection: We inspect your evaporative cooler, roof cavity, ceiling layout and switchboard, and discuss how you use each room.
- System design and quote: We size the system, design the zones and provide a fixed upfront quote.
- Removal of the evaporative unit: The roof-mounted unit and its dropper are removed, and the roof penetration is sealed and made weatherproof.
- Removal of existing ductwork: Old evaporative ducts and outlets are removed from the roof cavity.
- New insulated ductwork and plenum: We install new insulated ductwork, a plenum, zone dampers and motorised dampers.
- Indoor unit and outdoor compressor: The indoor unit is installed in the roof cavity and the outdoor compressor on a wall bracket or slab.
- Refrigerant piping and electrical work: Our ARCtick-certified technicians run refrigerant piping, and a licensed electrician connects the system.
- Ceiling vents and return air grille: New ceiling vents are fitted, and a correctly sized return air grille is installed.
- Commissioning: We test the system in all modes and check airflow to every outlet.
- Handover: We set up your controller, explain zoning and show you how to clean the return air filter.
What If Your Home Has Both Gas Ducted Heating and Evaporative Cooling?
If your home has both, a single reverse cycle ducted system can replace them. You get one system, one set of ducts and one controller for heating and cooling.
Many Melbourne homes have a gas ducted heater, often a Brivis, Bonaire or Braemar unit, alongside a roof-mounted evaporative cooler such as a Brivis Contour. Running two systems means two sets of ducts, two maintenance schedules and two energy bills. A reverse cycle ducted system consolidates everything.
The gas heater is decommissioned and removed as part of the changeover. Read our guide to replacing a gas heater with reverse cycle ducted air conditioning for that side of the process, or compare the technologies in our guide to gas ducted heating vs reverse cycle. You can also explore our heating services.
Is the VEU Rebate Available for Evaporative to Refrigerated Upgrades?
It depends on what is being replaced. The largest Victorian Energy Upgrades discounts apply when an inefficient heater, such as a ducted gas heater, is decommissioned. An evaporative cooler on its own is not one of the listed systems for decommissioning.
Here is how it typically works:
- Evaporative cooler only: The upgrade generally falls into the program’s “no decommissioned product” category, which carries a much smaller indicative discount.
- Evaporative cooler plus gas ducted heater: If the gas heater is decommissioned as part of the changeover, the upgrade may qualify for the larger ducted gas heater discount.
In every case, the new system must be a VEU-approved, high-efficiency reverse cycle air conditioner, and the discount must be arranged before installation. Eligibility rules and discount values change over time, so King & Sons confirms the current position for your home during the site inspection. Our guide to the VEU rebate for reverse cycle ducted air conditioning covers the program in detail.
Which Systems Suit Melbourne Homes?
Inverter reverse cycle ducted systems from Daikin, Mitsubishi Electric and Panasonic are popular choices for Melbourne homes switching from evaporative cooling. Each offers a range of capacities, star ratings and zone control options.
When comparing systems, consider:
- Inverter technology: adjusts output to match demand, improving comfort and efficiency
- Star rating: higher-rated heat pump systems cost less to run over their lifespan
- Capacity: must match a proper load calculation for your home
- Zoning: lets you heat or cool only the rooms in use.
On running costs, it is worth being clear. An evaporative cooler uses relatively little electricity to cool, but it only cools. Most homes with evaporative cooling also pay for gas heating, gas supply charges and the cooler’s water use. A reverse cycle ducted system replaces both, so the fair comparison is the combined running costs of evaporative cooling plus gas heating against one efficient heat pump system. Your result depends on your tariffs, insulation and usage. See our guide to ducted air conditioning cost in Melbourne for more context.
How Long Does the Changeover Take?
Most evaporative to ducted air conditioning changeovers take a few weeks from inspection to commissioning, with installation itself typically completed in two to four days for a single-storey home.
Typical stages include:
- Site inspection and quote: usually within a few days of your enquiry
- Scheduling and equipment supply: depends on season and system availability
- Installation: typically two to four days for a standard single-storey home
- Commissioning and handover: completed on the final day of installation.
Several factors affect the timeline:
- Roof cavity access: low or tight roof spaces take longer to work in
- Electrical requirements: switchboard upgrades or three-phase supply add time
- Home size and storeys: larger and two-storey homes need more ductwork
- Scheduling: demand peaks before summer, so book early for a spring installation.
King & Sons works across Melbourne. Check the areas we cover page, and keep your new system running well with an air conditioner service in Melbourne.
Frequently Asked Questions
Ready to Upgrade From Evaporative Cooling?
If your evaporative cooler is struggling through Melbourne summers, King & Sons can plan a complete changeover to refrigerated ducted air conditioning. Our ARCtick-certified, VBA-registered technicians handle everything from removal to commissioning, and every job starts with a free site inspection and a fixed upfront quote. Learn more about King & Sons, or contact us to book your inspection.