The new Cusano Environmental Education Center at the John Heinz National Wildlife Refuge in Tinicum, Pennsylvania, is a model for the conservation and efficient use of energy and water. The Center incorporates geothermal heating and cooling, energy-efficient lighting, a well-insulated building envelope, and natural daylighting to reduce building energy consumption. Other sustainable design strategies include use of green building materials with significant recycled content. The geothermal heating and cooling system alone is estimated to save approximately 25 percent of the energy compared to a conventional system. In addition, the Center has implemented an innovative on-site “marsh machine,” an organic wastewater treatment plant. Estimated savings for the project include $3,850 for the geothermal heat pump alone and more than 119 million Btu for FY 2000."