Previously WERS was a rating system that was based on 5 stars, with 5 stars obviously being the best window. We started to get windows rated that came in at 5.5 and 6 stars, however with the previous cap of 5 stars they weren't rewarded. With the introduction of the new Anual Energy Performance (AEP) it was time to move to a 10 Star rating system.

This moves WERS inline with AccuRate which is also now using a 10 star scale. The new AEP cannot be outdated the theroretical 10 star heating and cooling windows were generated by the AGO to provide extremes on both heating and cooling.

The perfect 10 star heating window has a U-value of 0.1 and a SHGC of 1.0 meaning that it has an extremely high insulation value yet allows all heat from the sun to come through. The 10 star cooling window has a U-value of 0.1 and a SHGC of 0.0 meaning that once again has an extremely high insulation but this time allows zero heat from th sun to pass through.

The AEP calculator takes three values of the window, U-value, SHGC and Air Infiltration to determine heating and cooling stars and percentage improvments based on a standard aluminium frame sliding window with 3mm clear glass.

The stars give an easy comparison for the consumer without getting too involved in the scientific side of the results.

The AEP is the Annual Energy Performance project commmisioned by the AWA to generate a calculator for developing stars and percentage improvements. The work was completed by Dr Peter Lyons, www.fenestralia.com and has been peer reviewed by PC Thomas and Angelo DelSante.

The WERS website has updated tables and notices about the AEP and Star ratings. Click here for the list of certified products.

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