Best Insulated Wood Fired Smoker

designed to cook in -20 degrees in Alaska.
www.rockinwsmokers.com/pit-details

I would say Ironside Smokers but they are in Wisconsin. Only insulated cabinet that I know of that can burn sticks and not damage the cooker.

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Besides Ironside, like mentioned.
There are other insulated smokers like Peoria. Though burning pure wood isn't the most common method using those cookers.
http://www.peoriacookers.com/custom-cookers/index.html
I modified my insulated vertical cabinet. I removed the insulation as part of that modification. I cook/smoke year round. I find no need for insulation. I cook in single temps often thru the winter. Even below zero at times. I find no need for insulation. Even in my UDS. Which I also can burn pure wood.
Do I burn more fuel in colder temps, yes. A bit more but not that much. I could not burn pure wood in my vertical before my modifications.
Plenty of Brethren smoke year round on there offset smokers. Some have insulated fireboxes. But not the cooking chambers.
But that is my experience.

Myron Mixon H20 series are insulated and wood fired.

These are not insulated fully; just the fire box. It is on my wishlist for the future except that I am a tightwad who rarely buys anything. I think for stick burning, it would be great.
Click on the VERTCAL SMOKER
https://johnsonsmokers.com/?option=com_content&view=article&id=47&Itemid=54

Those Ironside Smokers look pretty sweet!

Another vote for Ironsides. I waited on the list for a few months and out of the blue a Spicewine (Large) became available in my area. For the price I couldn't resist, but an Ironsides Smoker is on my "BBQ Bucket List."