Six interchangeable faceplates and Edge Expansion Port (EXP) technology are the latest features for the Edge line of thermostats. EXP acts as a digital memory card that owners can use to program the thermostat on their computers. The Edge thermostat has one of the thinnest profiles at 8/10 inch, and its two-wire setup is an industry first, the maker says. 800-227-7437. www.carrier.com.