I like herpstats but there are ecozone, habistat, and herp keeper. The ecozone and herp keepers are super advanced and not something you would ever connect to a rack. It is designed specifically for enclosures (lighting heating cooling misting and settings for different seasons as well)

On/off styles work well with racks but generally best with stable room temps and one that is not too cool. Porportional will handle basically any conditions and Rheostats work great as long as the room is completely stable.