There's no good reason for temp control itself to be attached to the internet. The people who work on-site can handle that. There are always people on-site who stock the fridges and cleaning, etc., and the managers for those workers. These things aren't sitting alone in a building with no human oversight for miles around. Monitoring and logging can be centralized while air-gapping the actual control of the temp.
I have no doubt that's exactly what they're working on right now.