I have not been able to check if it needs something like Ice or Blaze Rods, but I'm playing Fabric 1.20.1 and I'm unable to use the Thermoregulator at all.
I have found some 7-8 year-old posts about how it required Redstone Flux or EnderIO, but it sounds like that has been changed. Do I need a mod that adds FE? Or am I missing some way to use it without requiring energy?