Pop Up Soft Side Campers in the Winter

I had a Hallmark Milner for several years and their softwall is much better insulated than my buddy's Northstar. Outfitter also has a nicely insulated softwall. The furnace kept up even below 0F but condensation can be an issue when it's below freezing.

I currently have a Northstar hard side- warmer, quieter, more room...