LEED, or Leadership in Energy and Environmental Design, is program administered by the U.S. Green Building Council that awards points for buildings that incorporate various energy efficiency and water conservation features as well as providing such things as bike racks.

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About 93 percent of 3, 040 large U.S. hospitals used one or more day lighting or lighting conservation features, including tinted window glass (80 percent), reflective window glass (39 percent), external overhangs or awnings (47 percent), skylights or atriums designed to provide light (57 percent), automatic controls or sensors that increase or reduce lighting in response to the level of natural light (14 percent), and occupancy sensors that reduce lighting when rooms are unoccupied (46 percent).

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Those same instant opt-out features are also available on another service in Nest's program, a longer-duration conservation system called Seasonal Savings.

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