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According to the graph, homes built between 2000-09 consume only 2% more energy despite being 30% larger on average.
What is the MOST likely explanation for this phenomenon?
"Newer U.S. Homes Are 30% Larger but Consume about as Much Energy as Older Homes." Newer U.S. Homes Are 30% Larger but Consume about as Much Energy as Older Homes. U.S. Energy Information Administration - EIA - Independent Statistics and Analysis, 12 Feb. 2013. Web. 08 Apr. 2016.
2000-09 homes have more efficient air conditioners.
2000-09 homes use less energy on appliances, electronics and lighting.
Tankless water heaters are more likely to be used in 2000-09 homes.
Increased efficiency in home heating and insulation in 2000-09 homes.
Decreased demand for cooling among the 2000-09 homes.