Before we get into the savings tips, let’s look at what you’re actually spending.

The average Australian household spends between $560 and $890 per year on cooling, according to Canstar Blue. In Sydney, where summer temperatures regularly push past 35°C, that figure can climb even higher — especially if you’re running an older system or cooling your entire home around the clock.

Here’s a rough guide to weekly running costs during peak summer:

• Split system (single room): $5–$15/week
• Ducted system (whole home, standard): $30–$45/week
• Ducted system with zoning and inverter tech: $15–$25/week

The difference between a standard setup and an efficient one can add up to hundreds of dollars over a single summer. And the best part? Most of the changes that make the biggest impact are simple and free.

Set Your Thermostat to the Sweet Spot (24–25°C)

This is the easiest win. Energy.gov.au recommends setting your thermostat to 24–25°C for the best balance between comfort and efficiency.

Here’s why it matters: every degree you drop below 24°C adds roughly 10% to your running costs. So if you’re blasting your AC at 20°C on a hot day, you could be paying 40–50% more than you need to.

Most people find 24°C perfectly comfortable once the system has been running for a while. If it feels warm at first, give it 15–20 minutes — your home needs time to cool down evenly.

Quick tip: If your system has a “dry” or dehumidifying mode, try it on humid days. Removing moisture from the air can make 25°C feel significantly cooler without extra energy use.

Use Zoning to Cool Only the Rooms You’re Using

If you have a ducted air conditioning system, zoning is one of the most effective ways to reduce your running costs.

Zoning lets you divide your home into separate areas and only cool the ones you’re actually using. There’s no point pumping cold air into empty bedrooms while everyone’s in the living room.

With smart zoning and inverter technology, you can cut your ducted system’s running costs by 30% or more compared to cooling every room at once. That’s a meaningful saving — potentially $10–$20 per week during summer.

Even if your current system doesn’t have zoning, it’s worth asking about a retrofit. It’s one of the best return-on-investment upgrades you can make.

Keep Your Filters and System Clean

This one gets overlooked far too often, but it’s a big deal: a dirty filter can increase your air conditioner’s energy consumption by up to 15%.

When your filter is clogged with dust and debris, your system has to work harder to push air through. That means longer run times, higher electricity use, and more wear and tear on your unit.

Here’s a simple maintenance routine you can do yourself:

1. Check your filter monthly during heavy-use periods
2. Clean or replace it every 1–3 months depending on usage
3. Keep outdoor units clear of leaves, dirt, and garden debris
4. Wipe down vents and grilles to ensure airflow isn’t blocked

For a deeper clean and full system check, professional air conditioning maintenance is recommended at least once a year. A trained technician can inspect coils, check refrigerant levels, test electrical components, and identify issues that silently drive up your energy bills. Think of it as a tune-up for your car — a small investment that prevents expensive problems down the line.

Improve Your Home’s Insulation and Airflow

Your air conditioner can only do so much if your home is letting hot air in and cool air out. A few simple insulation improvements can make a surprising difference:

• Close curtains and blinds on sun-facing windows during the hottest part of the day. Block-out curtains or reflective window film can reduce heat gain significantly.
• Seal gaps around doors and windows. Weatherstripping and door seals are cheap, easy to install, and stop cool air from escaping.
• Check your roof insulation. Up to 35% of heat enters through the roof in summer. If your insulation is old or thin, upgrading it is one of the most cost-effective home improvements you can make.
• Use ceiling fans alongside your AC. Fans help circulate cool air more evenly, which means your air conditioner doesn’t have to work as hard. You may be able to set your thermostat a degree or two higher while staying just as comfortable.

These aren’t glamorous upgrades, but they add up. Better insulation means your AC cycles less frequently, which directly lowers your running costs.

Upgrade to an Energy-Efficient System

If your air conditioner is more than 10–15 years old, it’s likely costing you more to run than a modern equivalent — even if it still seems to be working fine.

Newer systems come with inverter compressors that adjust their output to match the cooling demand, rather than cycling on and off at full power. This alone can reduce energy use by 30–50% compared to older fixed-speed units.

When comparing systems, pay attention to the energy star rating. Here’s a simple way to think about it in dollar terms: each extra star on the label can save you roughly $100–$150 per year in running costs for a typical Sydney household. Over a 10-year lifespan, that’s $1,000–$1,500 back in your pocket.

If you’re considering an upgrade, it’s worth getting expert advice on the right system and size for your home. An oversized or undersized unit won’t run efficiently, no matter how many stars it has. Crown Air can help you find the right system based on your home’s layout, your cooling needs, and your budget — with honest advice and no pushy sales.

Take Advantage of Off-Peak Electricity Rates

If you’re on a time-of-use electricity plan, when you run your AC matters almost as much as how you run it.

Peak electricity rates in NSW are typically charged between 2pm and 8pm on weekdays — exactly when most people crank up the air conditioning. Off-peak rates can be 40–60% cheaper than peak rates.

Here are a few ways to work with your electricity plan:

• Pre-cool your home in the morning or early afternoon before peak rates kick in, then maintain temperature with minimal effort.
• Use a programmable thermostat or timer to schedule your AC around off-peak hours.
• Set your AC to a slightly higher temperature during peak hours (say 26°C instead of 24°C) and supplement with ceiling fans.

Small shifts in timing can lead to meaningful savings over a whole summer.

Stay Cool Without the Bill Shock

Reducing your air conditioning running costs doesn’t mean sacrificing comfort. It’s about using your system smarter — setting the right temperature, maintaining your unit, improving your home’s insulation, and being strategic about when you cool.

If your system is due for a service, or you’re thinking about upgrading to something more efficient, Crown Air is here to help. We’ve been keeping Sydney homes comfortable since 2009, and we’re always happy to have a chat about the best options for your home.

Get in touch for a free quote — no obligation, no pushy sales, just honest advice.