The only problem I run into with condensation is when I'm in one of my tents that is too short for me and my bag rubs against the ends of the tent. I'm about 6'2" and with a sleeping bag that's about 6'6". I always leave a lot of ventilation by keeping the door unzipped about 1/2 way open and that helps. The small amount of moisture that I do get on the ends of my down bags usually drys out soon enough.