Rated windows and skylights display the WERS logo, similar to that shown above. Each product has a certificate which certifies that it has been energy rated.

The window star ratings for heating and cooling rank the window against alternatives, using a ten-star scale based on 17 'generic' window types. The generic windows range from very low performance to very high performance in heating or cooling. The ratings apply to the effect of the whole window including the relative contributions of glass and frame.

Rating Labels
Rated windows carry a label which certifies that the window has been rated by the Australian Window Association. The window's cooling and heating performance is rated separately on a scale of 0 to 10 stars - the more stars, the better. These stars indicate the effect the window will have on the energy performance of the whole house.

Certified Accreditation
You should also look for the official WERS label or a WERS Compliance Certificate to certify that your window manufacturer is WERS accredited.