For those of you who won't have the opportunity to see these homes in person on the National Mall in Washington, D.C., from Sept. 23-Oct. 2, we've decided to gather up all the video walk-throughs of this year's entries in the Department of Energy's Solar Decathlon.

All of these homes are extremely energy efficient and, of course, solar-powered. There are more than 20 entries in this year's solar decathlon, and we'll be bringing you walk-throughs of every entry.

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Massachusetts College of Art and Design plus University of Massachusetts Lowell's 4D home.

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Rutgers plus New Jersey Institute of Technology's ENJOY House

City College of New York's Solar Roofpod

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http://vimeo.com/moogaloop.swf?clip_id=28301793&server=vimeo.com&show_title=1&show_byline=1&show_portrait=1&color=00adef&fullscreen=1&autoplay=0&loop=0

Living Light – Walkthrough from Living Light on Vimeo.

University of Tennessee's Living Light house