I've got two of the Maxxair deluxe fans in my camper. I can put one on intake and the other on exhaust and change out the air in my camper in about a minute. Of course, this only helps if the outside air is cooler than inside the camper. The remote makes it easier to adjust the fan speed etc over the bed. I don't have to climb up on the bed to make adjustments. You can also operate the fans when it's raining and leave the vents open during travel to help keep the camper cooler. They are kind of expensive ($300.00) but a nice improvement.
2016 Winnebago 2201DS Champagne
2015 Ford F-150 XLT FX4 5.0