Just like regular charcoal grills, kamado grills rely on airflow to regulate heat. More air moving over the coals lets a fire burn hotter while limiting the flow keeping coals just lit, for low-and-slow cooking. Look for a model with a tight-fitting lid and solid dampers or vents. Many kamado grills have a gasket on the lid, and even locking latches, to create the tightest seal possible. Some kamado grills also have multiple dampers, which makes it easier to fine-tune the temperature you’re shooting for.
Kamado grills fall into two categories: ceramic and non-ceramic. Ceramic grills tend to be heavier, with inch-thick walls all the way around which retain heat very well. Non-ceramic models are made of metal. They tend to weigh less and to be more maneuverable but do not retain heat as well.