In this lesson, students examine technologies that can be used to minimize building energy needs for credits in the LEED Energy and Atmosphere Credit Category. Students play a card game to learn about energy-efficient techn-ologies related to heating, ventilation, and air conditioning (HVAC) systems, lighting, and plug-in electrical uses. They also identify technologies and strategies that affect the efficiency of the entire building energy management system. They conduct research to explore in-depth how technologies, such as energy recovery ventilation systems, automatic sensors, smart home technology, and the ENERGY STAR® Portfolio Manager®, make buildings more sustainable. This lesson heightens student awareness of how sustainable choices in technology can affect personal comfort in the built environment as well as reduce the building’s environmental impact.