Hallway and Light Hardwood Floor Strategic site planning and smart technology help the 3,200-square-foot Great Gulf Active House achieve hyper-efficiency. The Toronto-based architecture firm, superkül, used triple-glazed windows; a solar hot water system; zoned heating; a fully automated HVAC system, skylights, and roller shades; LED lights; and spray foam insulation, among other green strategies.  Bold Suburban Homes by William Harrison from This Super Smart, Super Green Prefab May Be the Future of Suburban Living