....just saw this thread and did not see this mentioned. I too had trouble with what I thought the controller would do. I called AC and rep gave me this link to help me understand difference between the 2 controllers. they are the same housing and appear exactly alike. the display is different and you look on the tag on back for "67". The 67 is much easier to use I thought. I have both.
CONTROLLER 67 vs. Temp/Humid Controller
Our most advanced tech in our lineup, the temperature humidity controller is capable of regulating climate in grow tents, sheds, living rooms, and more. It comes included with our quiet, high performance fans like the CLOUDLINE duct fan and AIRLIFT shutter exhaust fan. However, this controller...
www.acinfinity.com