The heat ropes work fine. They are actually more accurate than flexxwatt because they dont vary from one to another as it is all one continuous cable. I have vision, freedom breeder and animal plastics racks and the vision are my favs( I have 4 now). I dont have any photos, go to the vision website and they should have pics.

As the humidity is concerned all you need to do is tape over the holes on the outside of tops to get the humidity dialed in. I only keep a few holes at the front(cool side) of the rack uncovered and tape over the rest. If you live in a humid place you would leave them uncovered or find a good median.

I have never used Johnson controls so I cant help you with that.