Add this option if you want to connect your cooling unit to an Ecobee Pro thermostat (thermostat not included). Up to 10 feet of wiring is included. If you require more than 10 feet, please include a note with your order with your desired length. Unless your thermostat has a separate probe, it will need to be installed within the cooled wine cellar environment. This upgrade is not compatible with the CellarPro bottle probe add-on.