I know I’m biased, but there’s no denying that solar is an amazing source of clean energy and an important tool for climate action. However, if you asked me what’s the main motivation behind solar panel installation around Australia, I have no doubt that a lower power bill is at the top of it.
Back when I was installing air conditioning systems around Sydney, I saw first-hand how hard some homes and businesses were hammering the grid just to stay cool through summer. I’d be up in roof spaces and on hot tin roofs, putting in systems that I knew would keep people comfortable – but I also knew they’d send the meter spinning if the gear wasn’t efficient. That’s what eventually pushed me deeper into solar and energy efficiency: finding ways to keep people comfortable without the nasty surprise when the bill turns up.
What The Star Rating Actually Tells You
You’ve probably seen those red and yellow energy labels with a row of stars on fridges, washing machines and air conditioners. The idea is simple: more stars generally means the appliance uses less electricity than similar models of the same size.
Two key things to look at:
- The number of stars – more stars = more efficient
- The annual energy consumption in kWh – this tells you roughly how much electricity it will use each year
When you compare two similar appliances, that kWh number is where the real story is. A higher star model might cost a bit more upfront, but over 5–10 years it can save you hundreds of dollars in running costs, especially for something you use all the time.
The Worst Offenders: The Big Power Users In Your Home
Not all appliances are equal. Some quietly sip power, others take big gulps. In most homes I’ve worked in, the main energy hogs are:
- Air conditioners (especially older split systems and ducted units)
- Electric hot water systems
- Fridges and freezers, particularly old or “spare” units in the garage
- Clothes dryers
- Ovens and electric cooktops
- Dishwashers and washing machines
- TVs and entertainment systems
- Pool pumps and filters, if you’ve got a pool
Let’s talk about a few of these in more detail.
When it comes to air conditioning, it’s often the single biggest contributor to high bills in summer and on humid nights. As a former air conditioner installer in Sydney, I’ve seen plenty of older units that are badly sized, poorly installed or just plain inefficient. They need to work harder and longer to cool the same space. Newer inverter systems with higher star ratings can do the same job using far less electricity, especially if they’re properly matched to the room and the home is reasonably insulated.
Hot water is another sneaky one. Traditional electric storage systems can use a surprising amount of power, because they’re constantly heating and reheating water in the tank. More efficient systems, like heat pump hot water units or solar hot water, can cut that usage right down. The difference becomes obvious when you compare annual kWh numbers on the labels.
Fridges and freezers run 24/7, so small efficiency gains add up fast. An old beer fridge in the garage might be costing you far more than you realise. I’ve lost count of how many times I’ve seen a decades-old unit humming away out the back, quietly adding to the bill every month.
Dryers, dishwashers and washing machines aren’t usually the absolute worst, but they still matter – especially if they’re older models or used heavily. Running hot washes all the time, cranking the dryer instead of using the line, or running half-full loads are all habits that nudge your energy usage up.
Pool pumps and spas, if you have them, can also be big consumers, especially when they run for long periods on old, inefficient motors.
Why Star Ratings Matter More Than The Price Tag
A common pattern I’ve seen: someone chooses the cheapest appliance in the shop, feels like they’ve scored a bargain, then ends up paying much more in running costs over the life of the unit.
If you only look at the sticker price, the cheaper, lower-star model often wins. But if you look at the estimated annual kWh and multiply that out over 5–10 years, the higher-star appliance usually comes out ahead. This is especially true for things you use every day or that run constantly, like air conditioners, fridges and hot water systems.
When I’m helping someone choose a new split system, for example, I always look at:
- The star rating
- The kWh per year
- How it’s going to be used (hours per day, summer vs winter)
- How well the room or house holds its temperature
A good quality, higher-star unit in a well-insulated space can cost a lot less to run than a cheaper low-star unit blasting away in a draughty room. Over time, that difference really shows up on the bill.
Where Solar Panels Fit Into All This
Solar panels don’t magically make inefficient appliances good, but they do change the equation.
Most solar systems generate the bulk of their power during the day, when the sun’s out. That lines up nicely with some of your biggest loads: air conditioning on hot afternoons, pool pumps, washing machines, dishwashers and sometimes hot water.
If you combine efficient appliances with rooftop solar, you effectively attack your bill from two sides:
- Efficient appliances reduce the total amount of electricity you need
- Solar panels supply a chunk of that electricity for “free” during the day
The more you can shift your usage into daylight hours, the better. Running the washing machine, dishwasher or pool pump while your panels are producing means you’re using your own solar power instead of buying from the grid. Even with air conditioning, using it sensibly during the day and not setting it too low can make a big difference.
From what I’ve seen on real jobs around Australia, households that pair good appliances with well-designed solar systems tend to see the best long-term results and the most stable bills.
Simple Steps To Cut Your Energy Use
If this all feels a bit overwhelming, don’t stress. You don’t need to replace everything at once. Start with a few practical steps:
- Work out your biggest power users and check their star ratings and age
- Plan to upgrade the worst offenders (like an old air con, fridge or electric hot water) when they fail or when you renovate
- Use what you already own more smartly:
- Set your air con to a sensible temperature (around 24–26°C in summer)
- Run major appliances during the day if you’ve got solar
- Use eco modes and full loads where possible
Think of it as a long-term plan. Each time you replace an appliance, go for the most efficient model you can reasonably afford. If you haven’t gone solar yet, or your system is undersized, it’s worth looking at that too.
Good Choices Make a Difference
The main takeaway is pretty simple: a handful of big appliances drive most of your electricity use, and the star rating system is one of the easiest ways to compare how much they’ll cost you to run.
As someone who’s spent years installing air conditioning in Sydney and now works in solar across Australia, I’ve seen the difference that good choices can make. Efficient appliances plus a solid solar setup won’t make your bill disappear, but they can take the sting out of it. If you’re not sure where to start, begin with your biggest users – usually air con, hot water and fridges – and build from there. Your future self (and your future power bills) will thank you.