By Guest Blogger Karen Appold Older homes are the most likely to need energy efficiency upgrades. Many lack double-pane windows or proper caulking and sealing, which can make them inefficient and drafty. An estimated 65 percent of U.S. homes, about 45 million, are under-insulated, according to the Harvard School of Public Health. In fact, some old homes don't have any insulation. This is because most states didn't adopt modern insulation codes ...

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