Does the Herpstat 2 control the temp of the heat tape or the ambient temp.?

I will be heating a styrofoam ice chest with UTH (taped on the inside of it) and was wondering how exactly the thermostat will control the heat. Does it sense the ambient temp and if it is above the desired temp. will it lessen the volt/watt output? Or does it only take the temp. of the UTH itself? I just don't want to create an oven for my animals.

Where did you put the probe?

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Originally Posted by PitOnTheProwl

Where did you put the probe?

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I don't have the actual unit yet, this is all just some problems people have chimed in with. But if I were to go with the Herpstat, I'd put the probe on the UTH or would it be better to let it hang?

Also, I've been looking at the Hydrofarm (https://www.amazon.com/gp/product/B000NZZG3S), I've been recommended this as I'm only going to be using UTH. Have you heard anything about this Thermostat?

Scratch the hydrofarm part, I'll be going with the Herpstat 2 for sure.

It controls what you put the probe on...

What else is going in the ice chest? Will it come in contact with the heat tape?

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Originally Posted by Slim

What else is going in the ice chest? Will it come in contact with the heat tape?

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Scorpions and sling enclosures, they won't come into direct contact with the heat tape