Energy-efficient. The house is connected to the grid and town water and sewer, and will include exterior wood siding, wood-fiber insulation, 10-inch-thick walls, a well-insulated roof, heat pumps ...

Airtight and super-insulated, a passive house uses around 90% less energy. When the Canadian engineer Harold Orr and his colleagues began designing an ultra-efficient home in Saskatchewan in the ...

This is a fairly typical American home. *house* Nestled in a quiet suburb of Maryland, it’s about 1,500 square feet, with three bedrooms across two floors.