I set the thermometer on my MES 30 to *225 with a plan to smoke a fatty for about 3 hours...This is a brand new smoker that has only been used twice before day. I pre-heated for 30 minutes, and noticed temps were up to *240 inside. I double checked my settings: yes, I had set it for *225. Dumped in the chips after pre-heat; the smoker continued to buzz along at between *235-*238 for the endurance of the entire cooking time. Should I be concerned about this? The first two times I used it temps primarily stayed near what I had set it at, only going a little higher when I added more chips. This time it was running hot even with NO chips... Thanks, Karen OH, BTW, hurray!! my first time fatty was a brilliant success, but I didn't take pics to post, I figure if you've seen one fatty you've seen them all. I used grilled onions with mushrooms and Monterrey Jack cheese. I basket weaved the bacon and rolled it up on a diagonal. My bacon looked more dark (from smoke) than others I've seen but the taste was to die for, Philly Cheesesteak type.