Jac and Gavin George, of Wanaka, in their new passive energy house. : Passive house warmer than extra jersey

Wanaka architect Rafe Maclean, one of the country's few certified passive house designers, outside the Georges' Wanaka home. : Passive house warmer than extra jersey

The kitchen. : Passive house warmer than extra jersey

The triple-glazed windows. : Passive house warmer than extra jersey