If you're using a UTH and monitoring your temps as was stated by the previous poster you shouldn't need to heat the whole room.

If the temp on the hotspot is 90*F. How cold do you think the air is in that area?

If the UTH maintains temps so even the cool side is 70-75*F How cool do you think the air is?

It's not as cool as the ambient air in the room. So heating the whole room is not necessary as long as you maintain a healthy heat gradient in the enclosure. An appropriate sized UTH should be adequate to heat almost all enclosures. Most produce so much heat that they should be regulated with a good remote thermostat to tweak temperatures from season to season.

As mentioned a humidity gradient is also essential with boas. This is near impossible to maintain with overhead heat and screen lids. Humid air also holds heat better than dry air.

The use of decent thermometers and I don't mean the cheap stick on ones but real thermometers is essential. Even better are infra red heat guns that measure the temps almost instantly. These are so inexpensive now that it is well within the budget of almost all herpers.
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BigT
There is a difference between ignorance and stupidity. The ignorant can be taught, stupidity is beyond our control.
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