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 1 of 9 in The Eco-Friendly Guide to Upgrading an Existing Home from Modern Homes Across the American Midwest

The Eco-Friendly Guide to Upgrading an Existing Home1 of 9

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!

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