My suggestions would be similar, probes for humidity, and hot and cold side. Also being able to mount them, or make them stackable. I have no idea if this would be possible, bc im not an engineer lol, but having a thermometer that could display the stats for multiple tubs on 1 unit like on one screen would be cool. Im not sure if im doing a well enough job explaning it though. Let me know if you get what i mean...