We just drove down from Ninilchik, AK to Austin, TX, a late start on our snowbird winter migration. We were pulling our 2016 rPod 179. We took all water out of our pod before leaving. It was during a deep cold snap for this area of Alaska and Canada.
Near the AK/Canadian border temps were in the -40's*F. One night we saw -47*F on our temp monitor in our truck. at these temps if you turn off your truck in 5 min it is cold inside the cab. Restarting your truck every 1-2 hours is highly recommended unless you want to spend the winter there.
Later that night when it had warmed up to near -40*F we stopped and fired up the propane heater under the bed for 2 hours. It got to +24*F and maintained that temp. So we got back in our truck and went on down the road trying to escape the ice box we were in.
On another night that was in the high -20's*F we took a sleeping bag and hung it in such a way that it blocked off all the pod except the bed area. This worked very well- warming the sleeping area in about 10 min. Of course cracking a window to insure you have no carbon monoxide or dioxide build up is a good idea- just don't open it too much or you'll find yourself back in the ice box!
For those foolish enough to attempt winter podding in the far north or who get caught like we did in bitter -cold to the bone- weather, having the furnace under the bed and sectioning off this area can save your frozen tooshes and actually give you a good night's sleep. When we first bought the pod I thought having the furnace under the bed was a hazardous and not well planned design- but I don't think so anymore.