From across the room or across the country, your Sensi Smart thermostat makes it easy to remotely control and schedule your home comfort - Anytime. Anywhere. Designed to work with the wires you already have, Sensi does not require a common wire (c-wire) for most installations, so it is compatible with the HVAC equipment in many homes in U.S. The ENERGY STAR certified Sensi thermostat helps you save on your HVAC energy costs, with features like geofencing, 7-day flexible scheduling, remote access and in-app system usage.