[UPDATE - see bottom] Dang. I bought the MES 40 at Academy a few weeks back, and I noticed the temperature was 50 degrees (!) off, but then I experimented with deflectors and tried to get the temperatures to stabilize and thought I had. So today, I'm having the same problem - as a result, I'm struggling to get the temperature to 225, and I'm trying to smoke my turkeys. I just need to get through today, and then I'll either exchange it or call Masterbuilt about the problem. I really want this smoker, and I'm sure I just had a defective unit. Meanwhile, if anyone has any ideas on how to trick it into reaching higher temps, let me know! UPDATE - ok, I'm confused. Even though my temps seem to never get above 225, these birds (one 13 lb turkey and one 6 pound breast with both, both spatchcocked) seem to be cooking much faster than I expected or planned. About 1:45 in, both are at 133 degrees. Now I did let them sit in the kitchen for almost an hour before starting, and I assume I have to count that time in the 40-140 window. I have no idea why they're cooking fast, or whether there will be a stall, and the temperatures baffle me, but right now, I'm feeling pretty good that they're going to be great!