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The biggest proportion of household energy goes towards temperature management -- heaters, air conditioners, or in some climates, both!

Space heating, water heating, refrigeration and air conditioning add up to 75% of the energy used by households in USA: http://www.eia.gov/energyexplained/index.cfm?page=us_energy_...

Although I was slightly surprised that "lighting and other appliances" is as much as 25% of the home energy use.