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Insights from a 5-year efficiency experiment

Retrofitting a home to be energy-efficient results in the home using considerably less energy than a typical built house, according to a five-year research project by The Tennessee Valley Authority.

Three similar homes in Knoxville, TN, were used for comparison.  Each had two floors, between 2,400 and 2,500 square feet, and had their broad side to the sun.  One home was a typical build-spec house.  Another was a retrofitted house supposed to represent the upgrades that a typical homeowner could accomplish.  The third was a Near Zero Energy home built with efficiency standards in mind.

The TVA discovered that the retrofit house used about 37 percent less energy than the typical build-spec house while the Near Zero house used about 55 percent less.

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