John C.Stennis航天中心（SSC）标准（SSTD）定义了SSC新的和现有的供暖、通风和空调（HVAC）系统的运行和维护的节能实践、方法和指南，以实现能源的高效利用。需要这些节能实践、方法和指南来确保SSC？遵守美国国家航空航天局（NASA）机构要求、联邦法律和行政命令。

This John C. Stennis Space Center (SSC) standard (SSTD) defines the energy conservation practices, methods, and guidelines for the operation and maintenance of new and existing heating, ventilation and air conditioning (HVAC) systems at SSC for efficient utilization of energy. These energy conservation practices, methods, and guidelines are required to ensure SSC?s compliance with National Aeronautics and Space Administration (NASA) Agency requirements, Federal Laws, and Executive Orders.