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Depending on your smoker. If you have leaks all over the place or its light gauge and un-insulated then it may need some tending to. Sometimes just good mods to an existing smoker goes a long way. But most all backyard charcoal / wood smokers need some tending to. If you want set and forget then a pellet eater or an electric are what you need. I built my smokehouse knowing I was going to use the pitmaster so its very air tight. The air in is really only thru the pitmaster tube so I keep very constant temp for a long time but with long smokes you still have to re-fuel sometimes.
I use the big weber smokey mountain smoker. Built like a tank except the door on the side. They couldn't have made it out of cheaper aluminum. Don't know why. they could have easier provided a sturdy door. But, I put fire resistant tape all around the edges. It's pretty air tight, but not perfect.
Theres a guy I know who does competitions and he has 2 WSM's along with a couple Stumps gravity feed cookers. He mated up the Webers to the newer Pitmaster 120's. Swears by them. Those things hold temps for a good long time.