I have to use both and never could maintain proper heat with just a UTH. I tried. I followed some guidelines off the web and it was bad info. 2 of substrate will never get to any kind of desirable surface temp so I use enough to cover floor with maybe 1/2. I have both UTH and CHE regulated by a thermostat. I have glass tanks for now but had to insulate them on top and three sides with foam board. Obviously I have some of the screen top open for fresh air but tried to cover as much as I could.
I know my Pastel was not eager to feed with temps to cool. One thing I have to do religiously is spray the substrate for humidity at least daily. During the summer it was even more frequent.
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