Mine is a 30" Masterbuilt electric 800 watt and I've had no problem smoking anything in it. All 4 sides are insulated, so that helps. I haven't used it in the dead of winter, but I suspect it'll be fine. The key to any smoker is to minimize opening the door. I use a wireless dual probe thermometer, so at least I don't need to open it to check temperatures.
For Sale, Mossberg 500 Cruiser 12 gauge 8 shot pump. I bought this 5 years ago, might have 50 rounds through it. It came with a pistol grip, I took it off and put a 6 position adjustable stock with pistol grip on it. For $220 I will include a bore snake/ rope cleaner, the mountable 5 shell holder and a cheap soft case.
Put on about 175 today. Didn't see another bike the whole time! Nice day! A few bridges had the spray, but otherwise good. About 15 miles of gravel mixed in thanks to the GPS set to "shorter distance". Temps 33-38.