Well, I use an electronic control called the BBQ Guru, or something like that. If you go to Bradley's website, you can find references to it there and discusisons about it. Try
www.thebbqguru.com for purchasing information.
There is also another attachment that one must buy; it is on the site, too. It is called the Power Raptor and it is basically a switched power supply that allows itself to be regulated by the BBQ Guru. The only difference is that you use it to regulate the heat in the box rather than regulate a fan.
Together they work just great. The Guru monitors the inside temp of the box and regulates the heat to maintan an even temp. It will even set and hold a desired temp with a ramp-up (to a goal) temp feature and then hold the meat there for hours, if desired.
None of this allows one to do cold smoking with the Bradley, but that can be accomplished with an add-on box.
B.F.