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ENERGY USE BY HOUSEHOLDS The use made of solar energy in Australia is primarily for heating water. It was used by 4% of all households in 2005, with the Northern Territory having the largest proportion of households (42%) using solar energy to heat water (graph 2.5). Solar energy for water heating was also popular in Western Australian households (16%). Heaters and coolers are major contributors to household energy use and costs. They account for nearly two-fifths (39%) of total household energy use and 14% of the residential sector greenhouse gas emissions. Unducted gas was the most common form of heating system used by households in 2005 (27%), followed by unducted electric heating (19%) and ducted gas heating (15%) (graph 2.6). Reverse cycle air conditioners were used in 20% of Australian households, up from 14% in 2002. In 2005, six in ten dwellings had some form of cooler installed (i.e. air conditioner or evaporative cooler). Since 1994, the most popular system of cooling has been reverse cycle/heat pump air conditioning (57% in 2005) (graph 2.7).
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