Bro you have the correct idea its just all mixed up.. Here is a simple fix until you can read up because there is a Post on here I will Copy and Paste that is the cats A** on setup..
Ambient temp (air) should be no leas than 78 (some say 75). With that said, IF your using a UTH your snake will go onto the heat when needed....back In the 90's all I used were UTH and never had a problem.
With that said it is still better to have a decent air temp anyway. You dont want the enclosure to be 50 degrees.
Just go buy a cheap Dimmer Switch for the CHE and adjust it like a dimming light.. Check temp every 30min and see where you want it so that air is (78-82), put your thermometer 1/2 way between top and bottom on cool side which is opposite of UTH basking. Also depending on your enclosure lid use some Tin Foil to seal it up a little over (if screened lid) to hold temps. Aquariums loose heat (Glass) like crazy. As for the UTH tape that Tstat to it... Then use a thermometer to check the floor area so you dont burn his Belly. If the UTH is 114 itself after it goes through the glass it might still be 100.. So lower tstat until your floor is 92. it Im telling you this as a limited budget way to keep the snake safe.. If you want a sweet setup and have the funds I can rattle off a setup in 50 words for around $700 including a PVC Snake enclosure.
So for now this will get you some reading time.