We use a dehydrator hooked to a temperature controller (https://www.amazon.com/gp/product/B00V4TJR00/ref=oh_aui_detailpage_o07_s00?ie=UTF8&psc=1). Turn the dehydrator to a high temp, plug it into the controller and put the temperature probe in the middle tray of the dehydrator near the cocoa butter containers. We put our airbrush in there, too. The temperature controller will turn the dehydrator on and off to maintain the set temperature. Much more flexible and accurate than the thermostat on the dehydrator.
As a bonus, you can plug a small refrigerator into the controller set to cooling mode to use the fridge for chocolate work.