Every year, K-12 facilities waste millions of dollars in excess energy consumption. Those dollars may take the form of lost heat through walls, windows, doors, and roofs. Or the villain may be poorly conceived or mismanaged control systems. Those excess funds that districts are sending to the local utility companies could be invested "at home" to improve the facility and work toward a zero net-energy environment. In this article, the author provides a list of top energy wasters and strategies to mitigate them. He also offers some suggestions on where one can start.