Oh man, I think Dr. Del hit the nail on the head. Just checked it and now that the fan is unplugged, the 'bator is the same temp. as the rest of the basement. Dangit! And I thought I was being so clever by adding one.

... I'll get this right one of these years ...

So, now, new question Assuming I can't find a Georgia Quail Farms 'bator (which I think I am going to look for; you're the 2nd person now who has recommended them ), what do people recommend using for a fan? Should I look for a different (smaller) fan? Or should I try and upgrade the size of my 'fridge in the hopes that A. the amount of heat the fan puts out will be dissipated in the larger interior space and B. I get enough clutches to justify (and necessitate) a larger 'fridge?

Thanks everyone!