I didn't interpret what you said that way. I wasn't intending my statement as argumentative, either, sorry if it came off that way. Just clarifying how I came to the conclusion that it needed to be turned off. And I figured I might as well add the part about the temps for the OP, so she wouldn't think it had to be 90 degrees before she turned the hotspot off. Guess that's what I get for posting when I'm tired....Originally Posted by PitOnTheProwl
Though, I can see how even a heat source on a thermostat could still be heating even though the room was very hot (not directing this at anyone in particular, just thinking out loud). The way most people set up an UTH with a thermostat, the probe is between the glass and the UTH, under the tank. Which means that the thermostat is usually set slightly higher than the desired temperature in the enclosure. So, for example, if the desired hotspot temp is at 90, the thermostat could be set to 95 (just making up #s here). This setup might work fine as long as the room temps are cooler, but if the room got up to, say, 90, the thermostat would still be trying to maintain the heat source at 95 and the hotspot in the enclosure would be hotter than desired. So, the thermostat would need to be adjusted to compensate for the higher ambient temps.
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