1) Never ever use tape inside of an enclosure.
https://ball-pythons.net/forums/show...ALL-caresheets!
2) A UTH MUST BE REGULATED BY A THERMOSTAT OR IT WILL BURN AND EVEN KILL YOUR SNAKE. Sorry to shout but I have been given too many "free" snakes that cost hundreds in vet bills because their prior owners didn't use a thermostat with a heating appliance, and despite the vet care I lost one to sepsis.
The thermostat probe gets sandwiched between the UTH and the underside of the enclosure. You measure the temperature over the UTH using a point thermometer or temperature gun to take the surface temperature of the enclosure floor, not the top of the substrate, because snakes burrow. You only need about 1/4" of substrate over the UTH anyway. A UTH does not increase the ambient temp in an enclosure.
3) A glass enclosure does not hold heat well as glass is a poor insulator. If you can't increase the room temperature then you will need an under-tank heater to create a basking spot, and some form of overhead heat to increase the ambient air in the enclosure. Personally I prefer ceramic heat emitters (CHE) or deep heat projectors (DHP) over a red bulb as they are more efficient and last much longer than heat bulbs.