Larry, it is made of very thick carbon steel, which is what makes it nearly indestructible, unlike the Big Green Egg I used to have (and sold because I was afraid to move it here from Florida). My take is that even sitting in my garage, that heavy metal gets pretty cold in the winter and that it takes a good long while to overcome that cold metal from a fire inside. A Weber kettle's thin metal gets red hot very readily as I noted when I watched my recently acquired yellow kettle turn orange when hot. Anyway, I think you have radiating cold working against you for quite a while, prolonged if it is really cold and windy outside.
I think Tom Horsman is right about the need for Spider to come up with an insulation package (like sold for several pellet grills). He also has suggested that the Spider Venom, while adequate for a regular Weber kettle that it was originally designed for, may be underpowered for the larger internal volume of the Huntsman.
While I am disappointed that the Huntsman couldn't be a winter high heat grill for me, the real deal breaker for me is my wife's anger that I want to cook on charcoal for family cooks. That's what has made the Huntsman no longer the right grill for me, despite some GREAT bbq it has turned out for me.
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I have kettles - and hopefully someday soon a return of my Weber CharQ - all more than sufficient for the times I can charcoal grill just for myself or for events. For home cooking, gas or pellet grills will have to be the choices. I am dreaming of options such as the Pit Boss Phoenix pellet kettle for when my Huntsman sells. I am getting inquiries but so far everyone has been pretty far from me.