Hi Mike, I would say mainly the brewhouse.
I have a stc-1000 setup for my keezer and mostly brew ales so my unfinished basement does a decent job keeping the surrounding temps in the right range. Planning to add iSpindels to monitor those, without fridge control.
I don’t know yet if I will stick with Fermentrack for that or with Brewbench monitor (mobile app) for a local/cloud data storage.
Cheers