I've fished pre-sunrise to post-sunset Friday and Saturday the past two weeks in my Otter XT X-Over Resort...sometimes down to -45*C (last Saturday night). The only things that frosted up were the tub and the windows. The Thermal-Tec fabric is out of this world and never iced up or showed any significant condensation. However, whenever I packed up to leave there is instantly a covering of frost across all the fabric. I ran the Big Buddy on medium most of the time, and switched it to high to warm it back up briefly if I opened a door. Low would start to get cold, but I had my coat off and no toque on.
I haven't had my new Otter Vortex out below -30*C yet, but I imagine it would be the same. It's the best insulated hub I have had. Also no condensation issues.
Personally, I think if you are having condensation issues you don't have enough heater for the task. With enough heat, you should be able to drive the moisture out of the tent.
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