" Save up to 23% annually on heating and cooling costs (compared to a hold of 72°F/22°C) Control from anywhere using your Android or iOS device Add SmartSensor to manage hot or cold spots and deliver enhanced comfort to the rooms that matter most Automatically pauses your heating or cooling when a door or window is left open (requires ecobee SmartSensor for doors and windows and a Smart Security subscription) To check if your system is compatible visit ecobee.com/compatibility ecobee was named an ENERGY STAR Partner of the Year award winner Integrates seamlessly with your preferred smart home system Compatible with most 24VAC HVAC equipment, including conventional furnaces and air conditioners (2H/2C), heat pumps (2H/2C + 2 stage AUX heat), boilers, and PTACs or fan coil units with up to 3 fan speeds. Hardwired. Power Extender Kit enables you to reliably power your thermostat if a C-wire is not available. Wire terminals “C R G Y1 Y2 W1 W2/OB PEK+"