Welcome to the forum!!! With the smoker you have (had one myself a long time ago in a galaxy far, far, away.....but I digress) temperature is controlled by how much charcoal you put in it, or more specifically, how much lit charcoal there is in the fire pan. You can control the temps somewhat by opening the side door to provide or shut off more oxygen, but the best way is to add several LIT briquettes as your temperature starts to dip. How many to add or start with is dependent on the smoker, the outdoor temperature, the temperature of the meat, etc. So you'll just have to play with it and learn how it cooks. After a few cooks with it, you'll have it figured out.