If you think about it even glass, which we all know is water tight, will connect condensation. Many ways to reduce the problem mentioned on this forum. Most are helpful in reducing. I have virtually eliminated the entire problem with a water collecting dehumidifier unit. I can collect three gallons of water from the air in twelve hours. I can even dry clothing by hanging it in the bathroom. Not sure why this is not a standard option in all hybrids. Problem solved.Unless you are boondocking this really works