Human: What is a "smart" thermostat and how does it work? Assistant: 
A smart thermostat is an electronic device that can be programmed to control the temperature of a home. It typically has sensors that detect when people are in the home, and adjusts the temperature accordingly. The thermostat can also be programmed to reduce energy consumption during certain times of day or week. Smart thermostats can help save energy by automatically turning off heating or cooling systems when no one is present.