I'm sure an electric or pellet recommended above would be easier to control that low. No problems with those recommendations.
BUT, I have been successful running my UDS with charcoal at 150*. I made 20# of summer and salmi back at christmas on mine. Came out great. It isn't that hard and held steady for hours. The hardest thing is then raising the temp to 185* and not overshooting. But even then it isn't the end of the world. (On tapatalk, i can't see your sig and what type of smoker you have).
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Proudly Smoking on a UDS, PBC &
Accidental Winner of the 2012 "Saucy" Throwdown.