Sure Len,
Purchased at coolerguys.com
I liked this thermal controller for the simple, flexible programming and that I can black out the display (it makes a nice night light).
Coolerguys Programmable Thermal Fan Controller with LED Display
A 12v/5.5v power supply is needed. I went with theirs instead of an ebay model because this one is confirmed to be stable with 10-40 volts.
http://www.coolerguys.com/840556102472.htmlv
The whole set up is pretty plug-n-play being intended for cabinet cooling of A/V equipment. I ended up running a small power/ground wire to a 3 Amp fuse in the power block to make a tiny dedicated circuit just encase a fuse blew it wouldn't effect the fan for the solar controller/refrigerator of food. It's on all the time and consumes 0.08 Amp fan off, 0.18 amp fan on.
Here is a pic from a previous topic but you can get an idea of size. The unlabeled blue display is the t-state, the fan is in the lower right and the power supply is mounded next to the t-state behind the wall.
If I can be of assistance please ask
-Eric