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Eion Scott

Hi Scott, have a look at Factsheet 2: Windows and Curtains on our website http://www.ecodesignadvisor.org.nz/advice-and-info/

There’s debate over whether double glazing is even warranted in the Auckland climate, but the paybacks for Dunedin are such that I would thinkĀ  you would want at least thermally broken aluminium and preferably wood/uPVC.