These are the little plug in devices that contain a temperature switch. I noticed that they are offered in a few models (to prevent freezing or overheating), but I need one that cuts in at about 65F and out at about 75F.

So....if anyone has one, can you unplug it, pry it apart, and see if one can access the trimpots insides?

Wouldn't be surprised if it just uses a thermistor as this would be much cheaper to produce this way, so you would have to change that out for a different value or add some resistors, depends what kind of mod you are looking to do and how the circuit is designed.