Four Winds Alternative and CTE High School is the first school designed to be net zero on tribal land in the country.  There are several features that contribute to its energy efficiency including: photovoltaic (solar) panels, a ground-source geothermal heating and cooling system, high-efficiency water-to-air heat pumps, energy recovery system for free heating and cooling, variable-speed fans and pumps to minimize excess energy use, occupancy sensors for demand-based lighting, LED lighting, solar tubes for free lighting, specially insulated walls and roof, and triple pane windows.