What accounts for the differences between BERS and WERS U-Values and SHGC?

While the manufacturer’s window identification code in BERS – and those found on WERS – agree, the U-value and SHGC do not exactly match. They can be and are often different, if only slightly. We have been told that this difference arises as the numbers on the WERS website are static and are as tested/ simulated at the time the window is registered and listed on the WERS website. The window libraries in BERS are subject to recalculation if the testing methods are changed, but the window code remains the same. As long as you are using the matching manufacturer’s window code then it is considered to be the same by the AFRC.

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