Ventilation is fine in ours. If we are looking for more ventilation (if we are not using the A/C or heat), we just turn on the bathroom fan, it creates a decent draft. Camping with our small children, it is sometimes handy to have that background noise, so that they don't hear us coming in to get a drink or snack in the evening.
2010 Jayco JayFeather 213 EXP
2016 Ford F-150, 4x4, 3.5L ECOBOOST, MaxTow, Supercrew, 6.5FT, 3.55 axle