Look beyond just the brand and focus on the system’s energy rating, capacity and suitability for your home. Compare systems using the Zoned Energy Rating Label, and make sure the system is correctly sized for your space. An efficient system that’s not suited to your home won’t perform as expected.

Generally, yes — but only when comparing systems of the same type and size. A higher star rating indicates better efficiency, but it’s important to compare similar systems and consider how they will perform in your specific home.

Energy efficient systems use advanced inverter technology, have higher star ratings and are designed to maintain temperature without excessive power use. Features like zoning (for ducted systems) and smart controls can also help improve overall efficiency.

Not necessarily. While premium systems often include more efficient technology, the most important factor is choosing a system that’s properly sized and suited to your home. A well-matched mid-range system can be just as efficient in real-world use.

Both can be energy efficient when chosen and installed correctly. Split systems are often more efficient for single rooms, while ducted systems can be efficient for whole-home cooling when zoning is used properly. The key is selecting the right system for how you plan to use it.

Yes, inverter systems are typically more energy efficient. Instead of constantly turning on and off, they adjust their output to maintain a steady temperature. This reduces energy consumption, improves comfort and lowers long-term running costs.

For cooling, a setting between 24–26°C is generally the most energy efficient. In practice, many households find around 23–24°C offers the best balance between comfort and running costs, especially during hotter Perth conditions.

As a general guide, every degree lower can increase energy use by around 5–10%, so avoiding very low temperature settings can help keep running costs under control.

In most cases, no. It’s more efficient to use your system only when needed and avoid running it in empty rooms. However, inverter systems can be more efficient when maintaining a stable temperature over longer periods rather than repeatedly turning on and off.

You can lower running costs by setting an efficient temperature, using timers or smart controls, closing doors to unused rooms and ensuring your system is regularly serviced. Even small adjustments can make a noticeable difference over time.

For optimal performance, most systems should be serviced at least once a year. Regular maintenance keeps filters clean, ensures components are working efficiently and helps prevent the system from using more energy than necessary.