How WERS Works
Rated windows and skylights display the WERS logo, similar to that shown below. Each rated 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.
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.
You should also look for the label below or a WERS Compliance Certificate to certify that your window manufacturer is WERS accredited:
Example of a WERS Label
To provide consumers with a simple benchmark, a comprehensive range of representative windows has been rated for their energy performance which is illustrated in terms of stars. No stars shows that the window is a very poor performer, 10 stars means excellent performance and a whole new world of energy efficiency and interior comfort. Manufacturers participating in WERS may offer custom rated high performance products which exceed the results shown below. Check the tables to see just how much benefit can be gained from a correctly selected window.
In addition, a 10 Star energy rated window will provide significant benefits in noise control and protection from fading. It is important to remember that window placement and site orientation also have an impact on the type of windows required within a house. Your WERS accredited manufacturer can advise you on the right windows to suit your home. Look for the sign that ensures your window manufacturer is WERS accredited.
"This Government recognises the important dual role good windows can make in improving quality of life, as well as leading to a reduction in greenhouse gas emissions. I am delighted to note the commitment shown by the window and glass industries to the success of WERS. I look forward to the continued success of this exciting initiative." - Department of the Environment & Heritage
"The Window Energy Rating Scheme is an excellent example of government and industry working in partnership to address the greenhouse problem. The Australian Greenhouse office supports the introduction of the Window Energy Rating Scheme and commends the window industry for helping to reduce greenhouse gas emissions." - Australian Greenhouse Office
"Windows remain the make-or-break issue in achieving a good whole-house energy rating. WERS is the vital source of data for such windows." - Tony Isaccs, Principal Project Leader, Sustainable Energy Authority Victoria.