As Australia heads into another winter, the question of how to keep homes warm without breaking the bank is more pertinent than ever. For 2026, the data is clear: reverse cycle air conditioners are overwhelmingly the most economical way to heat your home, offering significant savings over traditional gas or resistive electric heating.
While upfront costs for reverse cycle systems can be higher, their superior energy efficiency translates into substantially lower running costs, potentially saving Australian households hundreds, if not over a thousand, dollars annually. This guide breaks down the current costs, efficiencies, and available rebates for each heating method to help you make an informed decision for your home.
Understanding Heating Efficiency: COP is Key
When comparing heating systems, the key metric for efficiency is the Coefficient of Performance (COP) for electric heaters, or simply efficiency percentage for gas. A COP of 1.0 means that for every unit of energy consumed, one unit of heat is produced. Traditional electric bar heaters or panel heaters operate at a COP of 1.0 (or 100% efficiency).
Gas heaters, which generate heat through combustion, typically operate with an efficiency between 80-92%, equating to a COP of 0.8 to 0.9. This means some energy is lost in the combustion process or through flues.
Reverse cycle air conditioners, however, don’t generate heat; they move it. Utilising a refrigerant cycle, they extract heat from the outside air (even on cold days) and transfer it indoors. This makes them incredibly efficient, with modern units typically achieving a COP between 3.0 and 5.0. In practical terms, for every 1 unit of electricity consumed, a reverse cycle system can deliver 3 to 5 units of heat. This fundamental difference in operation is why reverse cycle heating is significantly cheaper to run.
“A modern reverse cycle air conditioner delivers 3 to 4 units of heat for every 1 unit of electricity used. In comparison, even the best gas heaters convert only 80–92% of gas into usable heat — and that’s before flue losses.”
Electricity and Gas Prices in Australia (Winter 2026)
Energy prices remain a critical factor. Here’s a snapshot of typical residential rates for 2026:
Electricity Prices (per kWh)
From 1 July 2026, Default Market Offer (DMO) and Victorian Default Offer (VDO) prices have seen varied changes:
- New South Wales & South East Queensland: Residential DMO prices are set to fall, with NSW seeing decreases between 3.4% and 7.7%, and SE QLD between 7.2% and 10.7%.
- South Australia: Residential DMO prices will experience a modest increase of 1.4%.
- Victoria: VDO prices are decreasing by an average of 5% for domestic customers.
Across the National Electricity Market (NEM), average residential usage rates in 2026 are generally:
- South Australia: 34-40 cents per kWh
- New South Wales: Mid-range, around 32.4 cents per kWh
- Victoria & ACT: Lower end, around 27-32 cents per kWh
- Queensland: Around 31.2 cents per kWh
- Western Australia & Tasmania: Regulated markets with their own pricing structures.
For a typical household, annual electricity bills on standing offers are estimated around $1,450 in NSW, $1,380 in Victoria, $1,420 in Queensland, and $1,580 in South Australia. However, market offers are often significantly cheaper than the DMO/VDO.
Gas Prices (per MJ)
Natural gas prices remain elevated compared to pre-2022 levels, but have stabilised somewhat in 2026. Gas is typically charged per megajoule (MJ).
Average residential usage rates for 2026 are approximately:
- Queensland: 2.45 cents per MJ
- Victoria: 2.58 cents per MJ
- New South Wales: 2.72 cents per MJ
- South Australia: 3.05 cents per MJ
- Western Australia: Uses ‘units’ (1 unit = 3.6 MJ) and generally faces higher prices.
Average annual gas bills for homes with gas heating can range from $1,090 in Queensland to $1,480 in South Australia.
Heating Options: Costs & Running Expenses
Let’s compare the three main heating methods based on typical 2026 costs and efficiency.
1. Reverse Cycle Air Conditioners (Heat Pumps)
Upfront Costs:
| System Type | Room Size | Typical Unit Cost (Supply) | Installation Cost (Standard) | Total Installed Cost (Approx.) |
|---|---|---|---|---|
| Split System (2.5kW) | Small Bedroom | $700 - $1,400 | $600 - $900 | $1,500 - $2,800 |
| Split System (5.0kW) | Living Room | $800 - $1,800 | $700 - $1,000 | $2,000 - $3,500 |
| Split System (7.0-8.0kW) | Large Open Plan | $1,500 - $2,600 | $1,000 - $1,600 | $2,500 - $4,200 |
| Ducted System | 3-4 Bedroom Home | $5,000 - $10,000 | $4,000 - $7,000 | $9,000 - $17,000 |
Note: Premium brands like Daikin and Mitsubishi Electric will be at the higher end of these ranges, while budget brands like Hisense and TCL will be lower.
Running Costs (Heating Mode):
Using an average electricity price of 32 cents/kWh and a COP of 3.5 (common for modern units):
| System Size (kW) | Power Consumption (kW) | Cost per Hour (Approx.) |
|---|---|---|
| 2.5kW | 0.7kW | $0.22 ($0.72/4 hrs) |
| 6.0kW | 1.7kW | $0.54 ($1.68/4 hrs) |
| 8.0kW | 2.3kW | $0.74 ($2.40/4 hrs) |
| 10-12kW (Ducted) | 3.5kW | $1.12 ($3.60/4 hrs) |
These figures demonstrate that reverse cycle air conditioners are significantly more efficient than electric resistance heaters. For example, heating a medium living area with a reverse-cycle split system typically costs around $50/month (for 4 hours/day), whereas the same space heated with a 2kW portable electric heater could easily exceed $100/month.
2. Electric Heaters (Resistive)
These include fan heaters, oil column heaters, and panel heaters. They convert 100% of the electricity they consume directly into heat (COP of 1.0).
Upfront Costs:
| Heater Type | Power (W) | Typical Model & Price (Approx.) |
|---|---|---|
| Portable Fan Heater | 2000W | $30 - $80 |
| Oil Column Heater | 2400W | Goldair 2400W: $149 [cite: 43 (previous search output)] |
| Panel Heater (Convector) | 2400W | Ausclimate Smart Large+ 2400W: $99 [cite: 29 (previous search output)] |
Running Costs (per hour):
Using an average electricity price of 32 cents/kWh:
| Heater Power (W/kW) | Cost per Hour (Approx.) |
|---|---|
| 1000W (1kW) | $0.32 |
| 2000W (2kW) | $0.64 |
| 2400W (2.4kW) | $0.77 |
While cheaper upfront, resistive electric heaters are the most expensive to run due to their 1:1 energy conversion. They are best suited for supplementary heating in small, well-sealed rooms or for very short periods.
3. Gas Heaters
Gas heaters come in two main types: unflued (portable) and flued (fixed, vented).
Upfront & Installation Costs:
| Heater Type | Power (MJ/h) | Typical Model & Price (Supply) | Installation Cost (Approx.) | Total Cost (Approx.) |
|---|---|---|---|---|
| Unflued (Portable) | 15 MJ/h | Rinnai Dynamo 15: ~$1,589 - $1,982 | $0 (Portable) | $1,589 - $1,982 |
| Unflued (Portable) | 25 MJ/h | Rinnai Avenger 25: ~$1,841 - $2,722 | $0 (Portable) | $1,841 - $2,722 |
| Flued (Fixed) | 9-25 MJ/h | Rinnai 309FT: ~$1,599 - $1,876 | $1,500 - $3,000+ | $3,000 - $5,000+ |
Note: Unflued gas heaters are subject to state regulations; for example, Rinnai Avenger 25 (over 18MJ) is not available in South Australia, and portable gas heaters are generally not suitable for new installations in Victoria. Flued systems require professional installation, including venting, which adds significant cost.
Running Costs (per hour):
Using an average gas price of 2.7 cents/MJ (mid-range across states) and typical efficiency of 89%:
| Heater Power (MJ/h) | Effective Heat Output (MJ/h) | Cost per Hour (Approx.) |
|---|---|---|
| 15 MJ/h | 13.35 MJ/h | $0.41 (15 MJ/h * 2.7 c/MJ) |
| 25 MJ/h | 22.25 MJ/h | $0.68 (25 MJ/h * 2.7 c/MJ) |
While seemingly cheaper per unit of energy than electricity, the lower efficiency of gas heaters compared to reverse cycle systems means you get less heat output for your dollar. Gas prices have also increased in recent years.
Comparative Analysis: Gas vs. Electric vs. Reverse Cycle
| Feature | Electric Heater (Resistive) | Gas Heater (Unflued/Flued) | Reverse Cycle Air Conditioner |
|---|---|---|---|
| Efficiency | 100% (COP 1.0) | 80-92% (COP 0.8-0.9) | 300-500% (COP 3.0-5.0) |
| Upfront Cost | Low ($50 - $300) | Medium-High ($1,500 - $5,000+) | Medium-High ($1,500 - $17,000) |
| Running Cost | Highest ($0.32 - $0.77/hr for 1-2.4kW) | Medium ($0.41 - $0.68/hr for 15-25MJ/h) | Lowest ($0.22 - $1.12/hr for 2.5-12kW) |
| Heat Delivery | Direct, radiant/convective | Direct, radiant/convective | Heat transfer (heating/cooling) |
| Installation | Plug-and-play (portable) | Portable (unflued) or professional (flued) | Professional (split/ducted) |
| Safety | Low risk | Ventilation critical (unflued), CO risk | Low risk |
| Environmental | High emissions (if grid powered) | High emissions (fossil fuel) | Low emissions (if grid powered, lowest for renewables) |
Maximising Your Winter Savings: Beyond the Heater
Choosing the right heating system is just one part of the equation. Optimising your home’s thermal performance can further reduce your energy bills:
- Insulation & Draught Proofing: Up to 35% of heat can be lost through ceilings, walls, and floors, and up to 25% through draughts. Investing in insulation and sealing gaps is crucial. Explore rebates in our guide: Unlock $1,500+ Winter Savings: Your 2026 Australian Insulation & Draught Proofing Rebate Guide.
- Zoning: Only heat the rooms you are using. Ducted reverse cycle systems often come with zoning capabilities. For split systems, close doors to unheated areas.
- Smart Thermostats: Program your heating to switch on and off when needed, and maintain optimal temperatures, avoiding overheating.
- Compare Energy Plans: Even with the most efficient heater, an expensive energy plan will negate savings. Regularly compare offers from retailers. Our guide can assist: Choosing Your Australian Energy Provider in 2026: A Definitive Guide.
Government Support & Rebates for Heating Upgrades (2026)
While the federal Energy Bill Relief Fund ended in December 2025, several state-based programs continue to offer support for energy-efficient upgrades, including heating:
- Victorian Energy Upgrades (VEU) Program: Victoria offers significant point-of-sale discounts on eligible energy-efficient products, including efficient reverse cycle air conditioners and replacing ducted gas heating. [cite: 27, 38 (previous search output)] This program also covers heat pump hot water systems, with potential combined rebates up to ~$1,630 (Solar Victoria + VEU). [cite: 7, 8, 14, 27, 33 (previous search output)] Note that the household income threshold for the Solar Victoria Hot Water Rebate is reducing to $150,000 from 1 July 2026.
- NSW Energy Savings Scheme (ESS): While primarily focused on hot water heat pumps (up to $330-$640), the ESS broadly supports energy-efficient upgrades, and accredited providers may offer discounts on heating/cooling systems.
- Federal Small-scale Technology Certificates (STCs): These are available Australia-wide for eligible heat pump hot water systems, reducing the upfront cost by several hundred dollars. The value of STCs decreases annually until the scheme ends in 2030, so acting sooner provides greater savings.
Always check your state or territory government’s energy department websites for the most current and specific rebate information, as eligibility criteria and available funds can change. For a comprehensive overview of support, refer to our guide: Australian Energy Rebates in 2026: Your State-by-State Guide After Federal Relief Ends.
Bottom Line
For Australian homes looking for the cheapest way to stay warm this winter 2026, reverse cycle air conditioning is the clear winner in terms of running costs. Despite a higher upfront investment than basic electric heaters, their superior efficiency means they deliver significantly more heat for every dollar spent on electricity.
While gas heating offers relatively quick warmth, rising gas prices and lower efficiency compared to reverse cycle systems make it a less economical choice for ongoing heating. Resistive electric heaters should be reserved for occasional, short-term use in small, well-sealed spaces due to their high running costs.
To maximise your savings, combine an efficient reverse cycle system with smart energy management, robust insulation, and by actively comparing energy plans to secure the best retail offer. Investing in these strategies will ensure your home stays warm and your energy bills remain manageable through the colder months.