Add this option if you want to connect your cooling unit to a Nest or Honeywell 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.