Last updated on June 28, 2026
If you’re looking for the most energy efficient split system air conditioner in Australia, the star rating is just the starting point choosing the right model for your climate zone is what actually determines your running costs. Brendan here from Coalfields Climate Control in the Hunter Valley.
With the temperature rising, having an efficient cooling system at home isn’t just a luxury; it’s an Aussie necessity. But it’s also important to be mindful of our energy consumption as, let’s face it, the prices are heating up. That’s why I’ve put in some hard yakka and have rustled up a list that’s jam-packed with the most energy-efficient split system air conditioners for you – no rip-offs or duds here.
Before I launch into the “cool” stuff, let’s get down to brass tacks and get clear on what I mean by “most energy-efficient split system air conditioner”. In simple terms, when I talk about an energy-efficient air con, I’m referring to how much cool air the system pumps out per unit of energy it consumes. Basically, how much bang for your buck. So, the most energy-efficient split system air conditioner is one that gives you the most for less, keeping your digs nice and comfy without making your energy bill skyrocket.
It’s written in the stars, or is it really? To ensure you get the most energy-efficient split system air conditioner, it’s worth checking out the stars or the energy standards, aka those bright red star stickers on everything. Let’s delve deeper into energy standards and efficiency in Australia. Every residential split-system air conditioner sold in our fair land has to meet minimum energy performance standards (MEPS). This means you can rest easy knowing that any new model you buy will be reasonably energy-efficient.
Manufacturers like our mates at Fujitsu, Mitsubishi, Daikin, and Rinnai register their models with the government Energy Rating system. Each air conditioner then receives a star rating label for cooling and heating. Based on the unit’s test results against the Aussie standard for air conditioners, these star ratings are an easy way to compare models.
Star ratings equate to greater efficiency. The more stars, the less the unit should cost to run, given it’s been installed correctly. So while a one or two-star model can do the job, a five or six-star model (or more) is clearly the better option, even if it might cost a bit more initially. Let’s face it, shelling out a bit more upfront is worth it when you end up with the most energy-efficient split air conditioner. We guarantee it’ll cost you less in the long run. Go for the Southern Cross amount of stars, or more, when you want true blue value.
And here’s some cool trivia for you: Since April 2020, new models are coming with a Zoned Energy Rating Label (ZERL). This shows three cooling star ratings and three heating star ratings based on the climate zone where the unit is installed. Because let’s face it, a most energy-efficient split system air conditioner perfect for a Sydney summer might not be the best choice for Darwin’s tropical climate. So these zone ratings help you choose the best model for your local conditions and needs. Heads up; if you’re in Darwin, QLD or Sydney, we also recommend something that can keep the moisture at bay – because no one loves a mouldy couch.
The key difference from the old label is that the ZERL rates each unit across three climate zones — hot, average, and cold and stars cannot be compared between the two systems. A unit that showed 5 stars on the old label might show a different number on the ZERL because the calculation method is entirely different. Ratings go up to 10 stars on the new label.
For most Coalfields customers in Singleton, Cessnock, Maitland, and surrounds, the Hunter Valley sits in the average zone for cooling and edges toward cold zone conditions during winter. That matters when you’re comparing units: a model with strong average-zone heating stars will run more efficiently through a Hunter Valley winter than one optimised only for a hot climate.
The ZERL also shows annual energy consumption in kWh per year for your zone, and noise levels in decibels for both the indoor and outdoor units. To estimate your running cost, multiply the kWh figure for your zone by your electricity tariff (check your latest bill for the rate per kWh).
Let’s discuss some contenders in the most energy-efficient split system air conditioner category. The top players in this game are Mitsubishi, Daikin, Fujitsu, and Actron Air. These legends have done their homework and have some top-notch units that provide maximum cooling for minimum power. To save you from spending hours of time digging, I’ve compiled a list of my top recommendations for the most energy-efficient split system air conditioners and even divided them into small, medium, and large unit categories.
Our recommendations are based on Star ratings and the system’s energy efficiency when it’s not in use, i.e., how much juice they suck up while waiting for you to hit the “on” button.
The most energy-efficient split system air conditioners are (in no particular order).
Star ratings below reflect the ZERL average zone rating. Running cost estimates are based on 30c/kWh and approximately 1,000 hours of use per year typical for a Hunter Valley household running the unit daily through summer and for heating through winter.
| Model | Cooling stars (avg zone) | Heating stars (avg zone) | Est. annual kWh (avg zone) | Est. running cost/yr |
| Daikin FTXF25W | 6.0 | 6.5 | ~380 kWh | ~$114 |
| Fujitsu ASTG09KMTC | 6.0 | 6.5 | ~370 kWh | ~$111 |
| Mitsubishi Electric MSZ-AP25VGD | 6.0 | 6.5 | ~385 kWh | ~$116 |
| Samsung AR09BXEABWK | 5.5 | 6.0 | ~400 kWh | ~$120 |
| LG WH09SK-18 | 6.0 | 6.0 | ~390 kWh | ~$117 |
| Model | Cooling stars (avg zone) | Heating stars (avg zone) | Est. annual kWh (avg zone) | Est. running cost/yr |
| Daikin FTXM35UVMA | 6.0 | 6.0 | ~570 kWh | ~$171 |
| Fujitsu ASTG12KMTC | 5.5 | 6.0 | ~590 kWh | ~$177 |
| Mitsubishi Electric MSZ-AP35VGD | 6.0 | 6.5 | ~555 kWh | ~$167 |
| Samsung AR12BXEABWK | 5.5 | 5.5 | ~620 kWh | ~$186 |
| Hitachi RAS-S35YHAB | 5.5 | 6.0 | ~600 kWh | ~$180 |
| Model | Cooling stars (avg zone) | Heating stars (avg zone) | Est. annual kWh (avg zone) | Est. running cost/yr |
| Daikin FTXM50UVMA | 6.0 | 6.0 | ~820 kWh | ~$246 |
| Fujitsu ASTG18KMTC | 5.5 | 6.0 | ~850 kWh | ~$255 |
| Mitsubishi Electric MSZ-AP60VGD | 5.5 | 6.0 | ~870 kWh | ~$261 |
| ActronAir WRE-060CS | 5.5 | 5.5 | ~900 kWh | ~$270 |
| LG WH18SL-19 | 5.5 | 5.5 | ~880 kWh | ~$264 |
Star ratings tell you the efficiency. Running costs tell you the dollars. Here’s how the numbers break down for a typical Hunter Valley home.
The calculation: kWh per year (from the ZERL average zone figure) x your electricity tariff = annual running cost.
Using a tariff of 30c/kWh — check your latest bill for your actual rate, as prices vary by retailer and plan:
| Unit size | 3-star model (est. kWh/yr) | 5-star model (est. kWh/yr) | Annual saving (5-star vs 3-star) | 10-yr saving |
| 2.5 kW (bedroom) | ~620 kWh ($186) | ~385 kWh ($116) | ~$70/yr | ~$700 |
| 3.5 kW (living room) | ~950 kWh ($285) | ~570 kWh ($171) | ~$114/yr | ~$1,140 |
| 5.0-7.0 kW (open plan) | ~1,400 kWh ($420) | ~860 kWh ($258) | ~$162/yr | ~$1,620 |
These are estimates based on average zone ZERL data and a 30c/kWh tariff. Actual costs vary with usage hours, thermostat settings, insulation, and your specific tariff. A properly sized unit running at the right temperature will always outperform a higher-rated unit that’s oversized for the room.
For a precise running cost estimate based on the specific model and room size you’re considering, give us a call. We’ll pull the ZERL data for the unit and work through the numbers with you.
If you want to combine my chock-a-block guide full of info with your own research, I’d recommend taking a gander at brands such as Haier, Daikin, and Actron Air for the most energy-efficient split system air conditioners. All of them are leading the way with tech that keeps your place liveable without costing you a fortune.
We love the bush, and let’s face it, our Aussie animals are one of a kind, so what about air-cons and the environment? There’s a bit of talk that air conditioners aren’t environmentally friendly. While they use electricity and contain refrigerant gases that contribute to global warming, a quality modern air conditioner is a highly energy-efficient form of cooling and heating. To make yours especially bush-friendly and save yourself some dollars, it’s worth insulating your home, using the air conditioner only when necessary, and running it on solar power.
Even the most energy-efficient split system air conditioner can end up costing you big bucks if you use it like a drongo.
Get the temperature right: Don’t set your air con to arctic temperatures, a comfy 24 degrees is just right. If it’s a bit chilly sometimes, chuck on some Uggs and a Flanno, and you’ll be right, mate.
Your air conditioner likely has a timer function. Don’t be a galah, just use it. Don’t have it running when you’ve popped down to the pub for a cold one with your mates.
Keep your air con in top shape to ensure it runs at its best. Your best bet is to get a specialised tradie to come out once every so often and give it the once over.
Proper insulation keeps the cold air in and the hot air out, so your unit doesn’t have to work overtime. Like your nana, get a door sausage if you’ve got drafty doors and windows; seal up those cracks.
Now let’s dive into a topic that’s bound to put a smile on your dial – government rebates for energy-efficient split system air conditioners in New South Wales (NSW).
In NSW, the government offers several programs to encourage households to adopt energy-efficient appliances, including split system air conditioners. These rebates can significantly reduce your upfront costs and help you save on your energy bills in the long run.
The NSW Energy Savings Scheme provides financial incentives to households and businesses for installing energy-efficient appliances. When you purchase a high-efficiency split system air conditioner, you may be eligible for rebates or discounts through participating retailers and installers.
Although primarily aimed at small businesses, households can also benefit from understanding similar energy-saving strategies. This program offers rebates to small businesses to upgrade to more energy-efficient equipment, including air conditioners.
While not directly related to air conditioners, the Solar Bonus Scheme allows you to generate and use renewable energy to power your air conditioning system, further reducing your energy costs.
Applying for these rebates is typically straightforward. Here are some general steps to guide you through the process:
Ensure that your new split system air conditioner meets the energy efficiency criteria set by the rebate program.
Choose a Participating Retailer or Installer: Purchase your air conditioner from a retailer or installer that participates in the rebate program.
Follow the application instructions provided by the rebate program. This usually involves filling out an online form and submitting proof of purchase and installation.
By taking advantage of these rebates, you can make your home more energy-efficient and save money on your energy bills. For more detailed information on all available rebates and how to apply, visit the NSW Government’s energy-saving website: Energy Saver NSW.
That’s it, folks; Brendan from Coalfields Climate Control saying hoo roo on my comprehensive guide to the most energy-efficient split system air conditioners. From one digger to another, take my advice and save yourself some dosh by getting one of my true blue top picks above.
Here’s to staying cool and energy-efficient! Until next time.
We are proud to serve a wide range of locations across the Hunter Valley region. Whether you need air conditioning, refrigeration, or solar solutions, our expert team is ready to provide fast, reliable service. Explore the areas we cover below, and get in touch with us for tailored solutions designed to meet your needs, wherever you are.
