Not sure where to post this question; this sounded like a good bet. We went fall camping this weekend and the temps got down to 30 at night, but into the 50s during the day. We did use our furnace in the mornings and at night before bed but really just enough to take the chill off. The cold temps don't really bother us much. And we also did plug into our generator and turn on the heated mattresses for about an hour before bed - but really the mattresses didn't even get all that warm to be honest. We only tried them because we never had before (we just got this new Rockwood 2516G pup this year). My question is this - we noticed when we were closing up the popup that our mattresses had quite a bit of condensation on the bottoms -- what would cause this? The weekend was dry, but was a bit on the humid side. Strange thing is, our canvas/tent material was all dry - no condensation anywhere to be found inside the camper - just on the bottoms of the mattresses. When we got home we had to take our mattresses out to dry, which is a bit of a pain. I'd love to avoid this in the future - any ideas how to avoid this and why it happened in the first place? Are the heated mattresses to blame?