[QUOTE=paroxysm;2496026]

cool side:
- ambient temp is 75 degrees. the thermometer is measuring the air.
thermostat is set to 104. heat pad is on the outside. thermostat probe is in between the heat pad and the tub.
- one hide
- water dish

QUOTE]

I'm assuming this is the part you are concerned about? If so, UTHs are great at providing "hot spots", but are typically pretty poor about raising ambient temperatures. If you are trying to increase ambient temperatures with a UTH, you will likely have to have a "secondary enclosure. What do I mean by this? The only people I have seen report notable increases in ambient temperatures are those using UTH in enclosed rack systems. So the tub with the UTH is essentially enclosed in a plastic box, so you would likely have to simulate a similar setup.

Alternatively, you could use the UTH for the hot spot then put either a low wattage ceramic heater on the enclosure or put it near a small space heater. The easiest solution by far is to use a UTH for the hot spot then use a small space heater to raise ambient air outside the tub. In a pinch, I have used ceramic heaters outside tubs about 18" away to raise ambient.