We camped this weekend and the temperatures at night dropped to the mid 50s. From our experience in our HTT, this is the time of the year when we'll start to get condensation on the inside of the canvas because we are 7 people in our HTT. The first night we ran the heater and the fan and we had no condensation. I didn't want to run the combo on the second night because I couldn't hear the sound of the waves (we camped @ Gamble Rogers which is as close as you can get to camping on the beach). So, I didn't run anything the last night, but the following morning I woke up to my daughters laughing and saying: "It's raining inside the camper !" It took the whole morning to get rid of the condensation, which delayed our departure. Do you guys normally run the fan at night with a window cracked open even when it is cold outside? I just hate to have to run the fan so that there is circulation, but then having to turn on the heat because people get cold inside the camper... and then not being able to hear nature. *sigh* I guess we all have to compromise?