You may think that an existing or historic home—known for its drafty windows, old-fashioned mechanical systems, and obsolete construction materials and techniques—would be one of the least sustainable, green-friendly buildings around, but you'd be oh-so-very wrong!  Photo 4 of 19 in Practicing Sustainability Is Easier Than You Think With These Handy Guides from Modern Homes Across the American Midwest

Practicing Sustainability Is Easier Than You Think With These Handy Guides

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The greenest home is the one you already have.