Heating (and in warm climates, cooling) are a large part of energy use, and this can be reduced dramatically by installing energy efficient windows and doors
Australia's love affair with renovating is expected to continue not only because Australians love to renovate, but also as households increasingly prefer to direct excessive property transaction costs towards improving their existing homes, rather than trading up.
Australia is a large and diverse country with huge differences in the climate from one end to the other. To maximise the energy efficiency of a building the right window choice is crucial.