I know with the Ranco you can wire 4 probes in combination series-parallel and do temperature averaging. Something I'll probably look at doing when I get more animals and a rack. The relays on the Ranco are quite audible when they switch over. I don't care, but some might not like it. Mine is in my room and it never bothers me at night though. As long as it isn't cycling every minute you probably won't care.