Energy Efficient house is a healthy future home and this idea has been developed by the architects in America. The following is Hampden Lane House, this house is energy efficient house located in Bethesda, Maryland, USA. Hampden Lane House designed by Robert Gurney Architect, a house is designed for long-term plans of the future are intended to make this house to be energy efficient and have a little property. The house was designed in the cube form that has a 2.200 square meters where all sides of the room fully utilized. The roof is also used as an outdoor living space, 1.100 square meters flat roof provide an area for outdoor activities.