This ten year old house was designed from the ground up to be extremely energy efficient. It utilizes superinsulation, passive solar, PV and a solar hot water system for heat and hot water. No on-site natural gas, oil or wood heat is used., it generates more electricity annually than is consumed and that includes heat, hot water, and all appliances. We currently have a $3,500 credit with the electric company. The house is attractive, very comfortable and pleasant in which to live. We particularly enjoy the natural lighting.