The temperature of a kamado cooker is controlled by air flow. There is an adjustable vent on the bottom and an adjustable vent on the top. Very small changes in air flow make big temperature differences. This grill leaks air very badly around the ash pan / lower vent assembly at the bottom of the keg. I was unable to get my temperature below 400f for over 8 hours on a test fire. The next day, I covered the offending assembly with electrical tape and was able to maintain a temperature of 250f for hours. It's shameful that a brand new grill needs to be taped up Red Green style to function properly. Shame on you Broil King!