Check this out for a redneck temperature control for your fermenter:
I can only fit 1 fermenter in my environmental chamber, so had to rig up a heating source for the fermenter outside in the cold of the garage.
I put the vest on jokingly last night, then realized it could actually work if I hooked up the temp controller to a 12V power supply...so I did, and it's working great!
Funny looking...thought I'd share...give you guys a few laughs.