What is a star rating on an energy label?
A star rating is a 1-to-6 star scale on the Zoned Energy Rating Label that indicates how efficiently an air conditioner unit converts electricity into cooling or heating, with ratings tailored to different Australian climate zones including Perth.
The Zoned Energy Rating Label, mandatory on all new air conditioner units sold in Australia, uses a star scale from 1 to 6 stars to express seasonal energy efficiency. Each additional star represents a meaningful improvement in how much electricity the unit needs to deliver cooling or heating output.
What makes the rating system practical for Perth is its zone-based approach. Australia is divided into climate zones reflecting temperature ranges, humidity, and seasonal patterns. The same air conditioner unit receives different star ratings depending on which zone it is rated for, because cooling demands vary significantly between Perth's hot, dry summers and other regions. A unit rated 5 stars for Perth's Zone 1 classification tells you how efficiently it will run under local conditions.
Running costs scale directly with star performance. A higher-rated unit draws less power to maintain your set temperature, which reduces electricity consumption and your energy bill over the unit's lifetime. Contractors and manufacturers use these ratings to help customers compare models fairly within their climate zone. The label also displays kilowatt (kW) figures for cooling capacity and annual energy consumption estimates specific to your zone.
When choosing an air conditioner installation, the star rating gives you a standardised way to assess operational efficiency. Energy-efficient providers in Perth can explain how a unit's stars translate to your household or business running costs under local conditions.