The Window Efficiency Rating Scheme (WERS) is the official, independent system of the New Zealand window industry comparing the effectiveness of your windows and glass doors.
The systems shows you how most of the common glass and frame types perform in terms of heating, cooling and fading.
HEATING the cost of keeping a home warm in winter
COOLING the cost of keeping a home cool in summer
CONDENSATION effectiveness in reducing condensation
FADING the impact on carpets and furnishings of the sun coming through windows
You can find out more about the WERS on the Metroglass website.