If you’ve heard of the Husten-Haskin house (mentioned in NYTimes + SF Chronicle), then you’ve heard of the architect behind the the Vital House prefab: Erin Vali of Ulterior Mode. The Vital House is designed to be both economical (1,500 sq-ft. at $300,000) and eco-friendly. Practically speaking, the firm is Brooklyn-based, so this prefab design will serve the east coast, at least in the near short-term, but this four-bedroom model was designed to adapt to virtually any location. The prefab utilizes solar-power and passive heating during the winter (with double-height walls on the south + east orientation). It also has water-filled tanks placed on the south + east spaces, which absorb radiant energy and distribute it through the house. Interestingly, construction is raised slightly off the ground, which accommodates both flat and sloped land sites. Another benefit of raised construction is that wind + air can cool the home. Some of the other specifics on the Vital House are still in flux, but I think this is a good start.