I used mine only in the bitterest conditions of the Nebraska winter, which was just three times out of 15 or so over the past four months. So as to not restrict air flow, I perched it up higher on the WSM so there was an ample air pocket on top, and made sure there was room for breathing down the sides. Temps were great, air flow, smoke, and delish finshed products. Well worth it for me, not to mention not having to gerry-rig some kind of hot water heater insulation stuff from Home Depot.