I have a big steel keg, similar to the big green egg in the way it operates. A few years ago I bought a Arbor Technologies Air controller, I don’t think they even sell them anymore, but it takes all the work out of controlling the temperature. More than once I have put a pork butt on around 7 PM, and it holds 200 to 225° perfectly through the night. I think there are many options for the big green egg as it is pretty much the industry standard, I highly recommend a air controller.