Condensation and humidity in an RV is a big issue. Not only does it cause damage to the RV interior with potential mould and mildew buildup but it can also have negative effects on your health.
Condensation happens when water vapour in the air comes in contact with cold surfaces such as windows, leaving a film of water - condensation. This can also occur behind seat cushions, under mattresses and in lockers. Since your RV is about a 10th of the size of the average house, cooking, hot showers and even breathing will quickly load up the air with water vapour.