I've read that during active fermentation beer temp can be 10+ degrees higher than ambient temp. Does this rule apply to a small space, such as a mini fridge? I just picked up a second Sanyo 4912 to use for fermenting since it's getting hot in my apartment. What should i set my Johnson temp controller to if i want the beer to stay around 65 degrees?
I'm also assuming the way the probe is mounted affects this. Right now i've got it hanging at the top of the fridge, but i was considering submerging it in water or blue freeze pack gel if that would yield more accurate control.