I live in Idaho where it gets pretty cold. I started out with an old SMO008, and out grew it fast. I looked at SMO25, and decided on the SMO45. I out grew it and got the SMO066. I have cooked with all of these when they were covered with both snow and ice. I finally built a cover for them. The 025, 045, and 066 all use the same sized racks. The good thing about all of them is they cook moist, and only use 2 to 8 ounces of wood. I have cooked 3 packer briskets in the 045, and can easily get 5 packers in the 066. Just a hint; If you decide on a Cookshack, order it directly from them. Call them and have them upgrade the racks to stainless steel, and the custom side racks. The custom side racks will give you more slots to to add more racks. This will be less expensive in the end.