So, I'm a bit new to smoking and I had been using some lump coal from the local grocery store here (Kroger) thinking it was a good grade. All of this time I have had trouble keeping the temps above 200 was due to the lump coal. I bought some Stubbs coal and just one chimney full kept it above 225 for 2 hours. That was without adding any more coal. I feel like an idiot because I have screwed up 2 racks of ribs in the past two weeks and the whole time I was babysitting the smoker, adding more lump, and using a blower to add oxygen for heat. Gahhhhhhhhhhhhhhhhhh!!!!!!!!!!!