OPEN YOUR VENTS
When your RV is not being used during the summer months, the inside coach can get up to 130 degrees depending on your location. That type of intense heat will cause even the toughest materials to break down and fail over time. Open your vents to let the air in. (But remember to keep the outside vents closed to keep the rain out!
Information from : https://gorving.ca/rv-maintenance/top-rv-maintenace-tips/