Decided to insulate my Landman 38" wide body and get ready for Maine winters. Picked up a sheet of Fiberduct board at a refrigeration supply and a roll of aluminum tape. The ductboard is rated R 4.3. It is compressed fiberglass with an aluminum face. Cuts easy with a knife. Taping the lower vent opening. One side and back Side view showing vent cutout Rack for thermometers Rack for thermometers The job took about four hours and materials cost 55 bucks. I fired it up at the 225 setting I used last and it gained 30+ degrees! I only insulated the sides, back, and top. May do the door sometime, but right now, it don't need it. Very satisfied with the mod. Gas savings alone should pay for it in a few months. Ready for cold weather smoking.