A Green Roof
The Smart Home's roof is covered with modular trays in which drought-resistant succulents and wild onions have been planted. These plants don't have to be watered, and they provide year-round savings to home owners. "A green roof helps you extend the life of the roof because it actually protects from the elements, but it also keeps the home warm in winter and cool in summer," Rashford says. You can eat the wild onions too!
Photo: JB Spector, Museum of Science and Industry