Enertia builds houses with solid, engineered wall segments in place of siding, framing and insulation. The houses are designed so that an envelope of air runs around the building, just inside the walls, creating a miniature biosphere.
Solid wood buildings, common in Europe and Scandinavia, are not seen much in America, except for log homes.
Enertia claims that their system is designed to make use of passive cooling and heating techniques (more details here). The wood that is used is Southern Yellow Pine, a renewable timber. Enertia also makes use of a number of other sustainable building technqiues.