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.

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

Rutgers plus New Jersey Institute of Technology's ENJOY House

City College of New York's Solar Roofpod

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