I used a lux temp controller that I picked up locally for $30 and a 5000btu ac unit I picked up on c-list for $50. The temp controller does hot and cold so in the winter I'll plug in a space heater and control that way.
All in all this ran me about $120 all together. I have 10 gallons in it fermenting right now and it is holding steady at 65F. The ac runs about 3 minutes once an hour with the temp probe wedged onto my fermenter.
Thanks for being here forum! I used lots of tidbits that I picked up from you guys.
Edit: I've added a gasket along the top of the door since these pics were taken
It has the room for 4 cornys, 1/2 barrel keg, and a tall 1/4 keg.