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I also pack a little snow around my trap skirting and sled base for added warmth.
When its windy or cold, and my dynoglo heater won't keep the shanty warm enough, I have a collapsable shovel that I usually bring with me. With it, I basically bury the outside of my shanty in as much snow as possible. I but the back of the shanty into the wind, and pack the snow has deep as possible around that side. I then just use the front zipper to get in or out. Even on the windiest of days, the shanty will stay at least above freezing, if not much warmer (2-man trap yukon). As a bonus, the snow piled up keeps the shanty from blowing away instantly (still have to anchor it on the windiest of days).