Welcome to the site!
It sounds like you have got some bad information. Lets start to clear some things up:
Tubs actually don't hold heat in well at all. They are really good at holding humidity in though.
You cannot use a heat lamp/CHE with a tub, to control the cool side temperature you have to heat the room itself to 75+ (80 is preferred) year round.
Please read through these 2 threads:
Cage heating: http://ball-pythons.net/forums/showt...t-Thermometers
BP care: http://ball-pythons.net/forums/showt...ius)-Caresheet
UTH's MUST be regulated by a thermostat. Without a thermostat UTH's can get 130 F + UTH's are not used for the cool side, but rather the hot side. They generate the 90 degree basking temperature, then you use a heat lamp (or in the tubs case a room heater) to control the cool side temperature.
Depending on how cold your room gets tubs might not be the best choice.
Here are step by step guides on how to set up a BP cage:
Tubs: http://ball-pythons.net/forums/showt...e-Basics-*DUW*
Glass Tanks: http://ball-pythons.net/forums/showt...With-Pictures!
Professionally Made Reptile Cage: http://ball-pythons.net/forums/showt...With-Pictures!
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