A new study involving an unusually large sample of 1.6 million homes sold in California between 2007 and early 2012 found that, holding all other variables constant, a green certification label on a house adds an average of 9% to its selling value. Researchers also found something they call the “Prius effect”: Buyers in areas where consumer sentiment in support of conservation is relatively high—with a certain percentage of hybrid-auto registrations—are more willing to pay premiums for green-certified houses.
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