Too hot?

[KMG]

I'm not certain that I am comparing. I was agreeing with Jon14 that lowering the setting on the thermostat does affect the ambient temperature of the enclosure. Logically, this makes sense to me, and it has been what I have experienced when I raise or lower the setting on my stat. IE: I raise the stat setting, the ambient increases; I lower the stat setting, the ambient decreases. And I would anticipate the same results were I using a UTH.

Well you anticipate and I'll speak from experience.

Research it a bit. You will find thread after thread of people thinking their uth is all they needed. They found that was not the case. A uth does very little for ambient temps. That is not their purpose and trying to use them as such is incorrect.