Without proper ventilation, condensation can become a major issue as well. Yet, even models with proper ventilation still may experience condensation build up from time to time. It is almost impossible to prevent it 100 percent of the time as multiple factors are involved that can speed up the process of condensation forming. For example, when the humidity rises outside, temperature changes, the environment is wet, or moisture is released inside, condensation has a tendency to form.
It is tough to combat the environment but you can select a logical campsite away from bodies of water. Also, in these conditions, keep it as ventilated as possible to keep the condensation issue to a minimum.