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RE: Energy efficiency, does it worth it?
If it's behavior usage, then that's a completely different topic. A lot of the energy efficiency measures integrate an automatic shut-off feature when it is not being used.
Where is the study that you mentioned?
California's energy usage per capita is much lower than the US national average.
Source: http://www.energy.ca.gov/2009publications/CEC-200-2009-015/CEC-200-2009-015.PDF