Small agm battery, portable charger, endless breeze, cig lighter to battery adapter. Zoila. The endless breeze does draw a bit of power 1.8 amps on low, up to about 3.5 on high...
Or put a GOOD vent fan in and just use that on the house battery.
2005 Bigfoot 1500C8.2 Truck Camper; MANY mods, to many to list
2007 Chevy 2500 Duramax Std Bed Ext Cab