Not everything is bigger in Texas. Take, for example, Heather Ferrier's home near Fort Worth—a compact, 2,028-square-foot house with tiny energy bills and minimal impact on the environment.

Designed to be as eco-friendly and affordable as possible, the house embodies a pretty mighty idea: namely, that being environmentally conscious doesn't require deep pockets. "If I can do it—being single, in my 20s, and without a lot of money," Heather says, "then anyone can."

Go inside Heather's green house!