We have the MaxAire vent covers on the front and rear ceiling vents. I keep the front ceiling vent (no fan) closed. The rear vent fan has a thermostat and it runs during the day and turns off around 7PM. I have one of the side windows cracked open about 2 inches. I close the front vent because for about 3 hours a day the FLORIDA sun is beating down on the TT's roof, which directs the heated roof air into the TT. By leaving the side window open the 2 inches, lets a little cooler air into the TT. Never gets the musty odor. The average daily temp inside the TT is around 88 degrees (have a weather station temp monitor in the TT).
The nice part is that I do not need to plug in the TT while at home because the SOLAR cares for all the TT's electrical needs between camping trips.
2013 Jayco Eagle 284BHS
250Watt Grape Solar Panel, MorningStar MPPT 60 Charge Controller
1500 Watt Ramsond PSI, 2 Trojan T145 Batteries (260Ah)
2 - AirSight Wireless IP Cameras (used as rear view cameras)
EnGenius WI-FI extender, D-Link wireless (n) modem
MagicJack Internet Phone
2012 Ford F150XLT, EcoBoost w/3.73
157" Wheel base, HD Towing Package
Our Solar Album http://www.jaycoowners.com/album.php?albumid=329