For Australian households bracing for winter 2026, the question of whether a gas heater or a reverse cycle air conditioner is cheaper to run is more critical than ever. With fluctuating energy prices and a focus on efficiency, the answer is clear: a reverse cycle air conditioner is significantly cheaper to run for heating your home this winter. This holds true across most of Australia, even when comparing against highly efficient gas heating systems.
The Clear Winner: Reverse Cycle Air Conditioners in 2026
Reverse cycle air conditioners are fundamentally more efficient at converting energy into heat. Unlike gas heaters, which generate heat by burning fuel, reverse cycle systems transfer heat from the outside air into your home. This heat pump technology allows them to produce multiple units of heat for every unit of electricity consumed, typically achieving a Coefficient of Performance (COP) of 3.0 to 5.0 for heating. This means they can deliver 3 to 5 times more heat energy than the electrical energy they consume.
Gas heaters, even highly efficient modern models, operate on a different principle. Their efficiency is measured as a percentage, indicating how much of the gas’s energy is converted into usable heat, usually ranging from 80% to 95%. While this is efficient for combustion, it cannot compete with the heat transfer mechanism of a reverse cycle system.
Understanding the Numbers: Electricity vs. Gas Costs
To compare running costs accurately, we must consider both the price of the energy source (electricity or gas) and the appliance’s efficiency. Prices vary by state and retailer, but the latest Default Market Offer (DMO) and Victorian Default Offer (VDO) figures for July 2026 provide a reliable benchmark.
“The Australian Energy Market Commission (AEMC) forecasts a 5% reduction in electricity prices through 2030 as renewable generation continues to expand.”
Here’s a snapshot of average residential energy usage rates and daily supply charges for July 2026, based on publicly available data:
| State | Average Electricity Usage Rate (c/kWh) | Electricity Daily Supply Charge ($/day) | Average Gas Usage Rate (c/MJ) | Gas Daily Supply Charge ($/day) |
|---|---|---|---|---|
| New South Wales | 32.4c | 0.88 | 2.72c | 0.88 |
| Victoria | 29.8c | 0.82 | 2.58c | 0.84 |
| South Australia | 38.1c | 0.94 | 3.05c | 0.96 |
| South East QLD | 31.2c | 0.85 | 2.45c | 0.80 |
Note: These are average figures and can vary significantly based on your retailer, specific plan, and distribution zone. Daily supply charges apply regardless of usage, adding substantial fixed costs to your bill annually (typically AUD $300-$450 per year for electricity).
Efficiency Matters: How Appliances Convert Energy
Reverse Cycle Air Conditioners
Modern reverse cycle air conditioners, such as the Mitsubishi Electric MSZ-AP Series or the Daikin Alira X, are highly efficient. A 5kW heating capacity unit with a COP of 4.0 will consume only 1.25 kWh of electricity to produce 5 kWh of heat. This efficiency is maintained even in cold conditions, making them a robust heating solution.
Gas Heaters
Gas heaters come in various forms, including portable unflued, flued, and ducted systems. Their energy efficiency is typically indicated by a star rating. For instance, a 5.8-star portable heater like the Rinnai Dynamo 15 (RRP ~$1,982) or Omega Altise Brigadier (RRP ~$1,199) might achieve around 90% efficiency.
More advanced ducted gas heaters, such as the Braemar 7-star equivalent ducted gas heater, boast efficiencies approaching 95% or higher, with Braemar claiming savings of up to AUD $577 per year compared to a 3-star model.
Real-World Running Cost Comparison: A Case Study (NSW Example)
Let’s consider a medium-sized living area requiring 5 kW of heating output for 6 hours a day over a 150-day winter season (900 total heating hours) in New South Wales. We’ll compare the usage cost only, excluding daily supply charges for a direct comparison of energy consumption.
| Appliance Type | Heating Output Required | Efficiency (COP/%) | Energy Consumption (per hour) | Energy Consumption (total 900 hrs) | NSW Usage Rate | Estimated Winter Running Cost (Usage Only) |
|---|---|---|---|---|---|---|
| Reverse Cycle AC | 5 kW | COP 4.0 | 1.25 kWh electricity | 1125 kWh electricity | 32.4 c/kWh electricity | AUD $364.50 |
| Portable Gas Heater (90% eff.) | 5 kW | 90% | 20.0 MJ gas | 18,000 MJ gas | 2.72 c/MJ gas | AUD $489.60 |
| Ducted Gas Heater (95% eff.) | 5 kW | 95% | 18.94 MJ gas | 17,046 MJ gas | 2.72 c/MJ gas | AUD $463.65 |
As this comparison clearly shows, even a highly efficient ducted gas heater costs over AUD $90 more than a reverse cycle air conditioner for the same amount of heat output over a typical winter season in NSW. For portable gas heaters, the difference is even greater, exceeding AUD $125.
State-Specific Rebates and Incentives for Energy Efficiency
Government incentives can significantly reduce the upfront cost of installing a new, energy-efficient reverse cycle air conditioner, further enhancing their cost-effectiveness.
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Victoria: The Victorian Energy Upgrades (VEU) program offers substantial upfront discounts. Eligible households can receive up to AUD $8,000 off a new reverse cycle air conditioning system, particularly when replacing an old gas ducted heating system. Replacing a non-ducted gas room heater with a split system can net AUD $712 to AUD $1,780 in discounts. Note: Significant changes to the VEU program are expected from 31 July 2026, potentially increasing the minimum customer contribution for larger systems from approximately AUD $1,000 to AUD $3,000. Act sooner rather than later to secure current rebate values.
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New South Wales: The NSW Energy Savings Scheme (ESS) provides upfront discounts of AUD $340 to AUD $730 or more when replacing an old unit with a new energy-efficient reverse-cycle system. For a standard 6kW split system, discounts can be up to AUD $550 for a new installation or AUD $560 for a replacement. Additionally, the newly launched NSW Home Energy Saver Program (June 2026) offers zero-interest loans of up to AUD $15,000 for energy-saving upgrades, including reverse cycle air conditioning, and a separate discount of up to AUD $4,000 for lower-income households (opening later in 2026).
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Queensland: Currently, there are no exclusive state-level rebates for air conditioners in Queensland.
These rebates can offset a significant portion of the initial purchase and installation cost of a reverse cycle system, which typically ranges from AUD $1,500 for a single-split system to over AUD $10,000 for a fully ducted system.
Beyond Running Costs: Other Factors to Consider
While running costs are paramount, other factors influence your heating decision:
- Installation Costs: Gas heaters (especially ducted) can have significant installation costs, including gas line extensions and flues. Reverse cycle systems also have installation costs, but these are often mitigated by rebates.
- Environmental Impact: Burning natural gas releases greenhouse gases. Reverse cycle air conditioners, particularly when powered by renewable energy like solar, offer a much lower carbon footprint. If you have solar panels, running your reverse cycle AC during the day can be virtually free, dramatically cutting your bills. Consider our guide on Optimise EV Charging with Solar This Winter 2026: Max Savings Guide for broader solar optimisation tips.
- Versatility: Reverse cycle air conditioners provide both heating and cooling from a single unit, offering year-round comfort and value. Gas heaters only provide heat.
- Safety and Air Quality: Flued gas heaters safely expel combustion by-products outside. Unflued gas heaters require adequate ventilation to prevent a build-up of pollutants, making them unsuitable for bedrooms or poorly ventilated spaces. Reverse cycle systems do not produce combustion by-products.
Maximising Your Heating Savings This Winter
Regardless of your heating choice, several strategies can help reduce your energy bills:
- Insulation and Draught Proofing: Ensure your home is well-insulated and draught-proofed to prevent heat loss. This is often the most cost-effective energy-saving upgrade. Refer to our guide on Cut Winter Energy Bills by $400+: Best Home Insulation & Draught Proofing Upgrades in Australia 2026.
- Zone Heating: Only heat the rooms you are using. Reverse cycle split systems are excellent for this, allowing precise temperature control in individual zones.
- Thermostat Settings: Set your thermostat to a comfortable yet energy-efficient temperature, typically around 18-20°C in winter.
- Regular Maintenance: Keep your heating system well-maintained. Clean filters on your reverse cycle AC improve efficiency.
- Compare Energy Plans: Regularly compare electricity and gas plans from different retailers. Even with DMO/VDO, better market offers are often available. For more comprehensive strategies, read How to Cut Your Electricity Bill This Winter in Australia 2026: Strategies After Federal Rebates End.
Bottom Line
For Australian consumers looking to minimise heating costs this winter 2026, the reverse cycle air conditioner is the unequivocally cheaper option to run compared to a gas heater. Its superior energy efficiency, coupled with generous state government rebates for installation, makes it the most economical and environmentally friendly choice for year-round comfort. While gas heaters provide effective warmth, their higher running costs and environmental impact position them as a secondary consideration in the current energy landscape. Prioritise investing in an energy-efficient reverse cycle system and combine it with smart home energy management strategies for the greatest long-term savings.