Efficient Windows

This section shows you how to choose the most efficient windows for your home

Prior to Government law changes requiring all homes to have higher levels of insulation, about 90% of homebuilders in the cooler climates voluntarily choose to insulate their homes using double glazing.

WANZ members work hard to provide New Zealanders with products that are specifically designed and engineered for the best price and performance. We recommend that you always consult with a WANZ, GANZ or IGUMA member early in your project to determine your best options.

The Window Efficiency Rating System is the official New Zealand window & door rating system which is coordinated by WANZ and supported by the New Zealand Government agencies:

Energy Efficiency Conservation Authority and the Foundation for Research, Science and Technology

WERS is coordinated by the Window Association of New Zealand.

It is supported by:

"The design and installation of windows have a major impact on a building's energy efficiency. Windows affect how much energy buildings use, how warm or cold they are and how comfortable they are for the occupants.

The Window Association's innovative Window Energy Rating System will go a long way towards improving energy efficiency in homes.

The Energy Efficiency and Conservation Authority (EECA) strongly supports WERS.

"We know it will make a real difference."
Energy Efficiency and Conservation Authority

WERS has Government Support

WERS has government support as a national rating system for windows, contributing to domestic energy conservation.

Improving the energy performance of windows also helps to reduce greenhouse gas emissions and to counter global warming.

A similar rating system operates in Australia, using different measure, and is valid for Australia only.

BRANZ, the Building Research Association of New Zealand, developed the computer software required to make the WERS calculations.