Add this item if your cellar is in an unheated environment and will be exposed to temperatures below your desired wine cellar temperature. Heaters are fully integrated and controlled through the digital control panel. Heaters must be ordered with either the remote control/display panel or one of the networkable thermostat add-ons, and must installed in the factory (ie integrated heaters cannot be retrofitted). These heaters are designed for adding heat only, not for dehumidification.