Reverse-Cycle AC vs Gas Ducted Heating: Which Saves More in Australia?

We compared costs for a typical 3-bedroom Australian home (180 sq m) across capital cities, including installation, 10-year operating costs, and state incentives:

Source: energyrating.gov.au Zoned Energy Rating Labels, AEMO 2026 pricing

Reverse-cycle air conditioning is the cheaper option for most Australian homes in 2026, especially if:

• You live in a state with reverse-cycle / heat pump incentives (VIC, SA, NSW, ACT offer AU$1,000-AU$4,000 rebates)
• You currently heat with gas but also need cooling
• You are building new and want a single system for both seasons
• You live in a moderate to warm climate (most Australian capitals qualify)

For a home in Melbourne currently using gas ducted heating, switching to a high-efficiency reverse-cycle system cuts annual heating costs from about AU$1,200 to AU$600 — a 50% reduction. With the VIC Energy Upgrades program and the national STC scheme (if adding solar simultaneously), the system pays for itself in 3-5 years. Even in colder capitals like Canberra or Hobart, modern reverse-cycle split systems maintain CoP 3.0+ down to 0°C, making them more efficient than gas ducted heating for 90% of the heating season. Gas only wins in areas with exceptionally cheap gas (below AU$0.03/MJ) and no state incentives.

A gas ducted system could make sense for a specific set of homeowners:

• You live in Victoria where legacy gas infrastructure keeps prices at AU$0.03/MJ
• Your home already has ducted gas heating installed and functional
• You only need heating (you already have a separate air conditioner in good condition)
• You live in an area with consistently high electricity rates (above AU$0.35/kWh)

In parts of Melbourne where natural gas averages AU$0.03-0.035/MJ and electricity is AU$0.25/kWh, gas ducted heating and a CoP 4.0 reverse-cycle system have very similar operating costs — within AU$50-100 per year. The decision comes down to whether you need cooling or value the gas connection for other appliances.

Beyond direct cost savings, reverse-cycle systems offer several advantages:

1. All-in-one heating and cooling: No need to install a separate air conditioner, saving AU$2,000-AU$5,000.
2. Better for the environment: The Climate Council notes that reverse-cycle AC powered by Australia's grid (~38% renewables in 2026) produces 40-60% less CO₂ than gas heating. As the grid adds more renewables, this advantage grows.
3. No gas connection fee: The daily gas supply charge adds AU$0.60-AU$1.20/day to your energy bill — AU$220-AU$440/year just for the connection. Eliminate gas entirely and you save that amount before even running the system.
4. Future-proof: AEMO has warned of gas shortfalls in southern states from 2027 onwards. Domestic gas production is declining, and prices are expected to rise as LNG export contracts take priority. A reverse-cycle AC is insulated from these increases.
5. Summer peak performance: Reverse-cycle AC excels at cooling, which is the dominant energy load for Australian homes. In summer, a gas ducted system is useless for cooling.

Annual heating costs estimated for a 180 sq m home. Actual costs depend on insulation, thermostat settings, and personal behaviour.

Ready to see which heating system saves you more money over the next 10 years? Use our free calculators: → Compare reverse-cycle AC vs gas costs for your home Our tools use real local energy prices from the Australian Energy Regulator (AER) and the latest 2026 incentive values for your state to give you a customised comparison.