A thermostat is provided that is capable of reliably reducing the operation of an air conditioner and other systems to provide energy cost savings to the consumer and load reduction to a utility provider. The thermostat includes at least one sensor configured to communicate information indicative of...http://www.google.com.hk/patents/US8177139?utm_source=gb-gplus-share專利 US8177139 - Load management thermostat
