8 Cool Ways to Build Green (page 6 of 8)

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Occupancy Switches

Scientists haven't figured out how to get kids to turn off lights in their rooms. But they've made great strides in occupancy switches, which sense when no one is in a room and then shut off automatically. Older models that monitored ambient sound levels were not reliable; the latest switches rely on infrared technology, ultrasonic signals, or both. Infrared switches are most common in homes; they need a direct line of sight and work best in simple four-walled spaces. Some, like Leviton's Decora Occupancy Sensor ($70), are designed to replace a standard wall switch. Others are ceiling-mounted. Visit sensorswitch.com or smarthome.com for more information.

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