Four is the magic number for energy efficiency improvements to pay off - latimes.com: "Homeowners need to complete an average of four energy efficiency upgrades, such as insulation or high-efficiency windows, to see their utility bills decrease, according to a new survey released Tuesday. Homeowners who completed only 2.3 improvements actually saw their bills increase 10% to 30%, according to the 2011 Energy Pulse Survey by the Shelton Group, a Tennessee-based marketing group focused on sustainability that polled 1,502 Americans."
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