OK. Thermostat is on and the temp is dropping because yes, it was way too high. It's not a super expensive one. Not digital, but we will keep an eye out to see what the temp is when it turns back on and adjust accordingly. Then, tomorrow I will get another thermometer to tell the temp of the surface in her hut. (I will move or get rid of the ambient black light if needed to get the surface temp to 88-90.) I like the dim light since I can see her with it and it's so dim it doesn't bother her.

The temp on the cold side reads 83 degrees at the surface, just outside her hut. It's with the 75watt ambient black light. Should it be at the surface IN the cold side hut or is it ok where it is?