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California working towards more homes with zero net energy

Mr and Mrs Genau start up a phone app that allows them to change the temperature of their house - one of the 20 homes in Fontana built as a testing ground for an energy system of the very near future.

Fontana, California

AT first glance, Anthony and Vanessa Genau's home in a subdivision beneath the San Gabriel Mountains is like any other gracious new suburban dwelling, with open-plan living space, granite countertops and stainless steel appliances.

But, along with 19 other cream