1. A system, comprising: a thermostat disposed at a site and including a communication module capable of communicating with a mobile device associated with the site; said thermostat including a proximity detection module disposed thereon, said proximity detection module having a home mode and an away mode; said thermostat configured to enable the away mode; said proximity detection module configured to: detect a presence of a user at the site; and alter an operating condition of the thermostat during the away mode in response to the detected presence of the user.