Energy Rating Certificate

When you talk about the energy efficiency of windows, it is not just the glass but the whole window system, which includes the frame, glass, seals and spacers. All components make a difference to the energy used in your home. Tested window products receive a rating called the U-value. A lower number indicates more energy efficiency. The U-value can be as high as 7.5 in some windows and doors and as low as 0.8 for extremely energy efficient products (0.8 is Paarhammer’s latest and best rating).

The testing of energy efficiency must be performed by a rating organisation which is accredited by the AFRC – Australian Fenestration Rating Council. This ensures the testing is consistent for all products, follows the Building Code of Australia and protects consumers. These ratings are published by WERS (Window Energy Rating Scheme).

WERS is underwritten by the Australian Government’s Greenhouse Office as part of its commitment to improve energy efficiency and reduce greenhouse gas emissions in the build environment. WERS is independent of any individual manufacturer and is managed by the AWA (Australian Window Association).

Different countries test energy efficiency levels differently, and the U-value number results cannot easily be transferred to Australian ratings. In Europe, the U-values of windows are calculated using different temperature conditions, and in the United States of America the final data is based on imperial units.

Comfort, amenity and resale value are improved by using high-performance windows. Not unlike buying a fridge, washing machine or other appliance for their star rating, the window industry has progressed to offering true consumer goods viewed as performance appliances for energy, noise and security.

As a consumer you should insist on receiving an energy rating certificate which states the energy efficiency ratings of your windows and doors.

Paarhammer ratings on WERS