We leave our dump vents open until the living area reaches a comfortable temperature, then I'll close all but one to spread the cool air throughout the trailer with the ducts. Sometimes before we go to bed, I'll close the last one to get as much air to the bedroom as possible. Our AC units work HARD down here in Texas!
2014 Jay Flight 28 BHBE
2015 RAM 2500 6.4L HEMI, Tradesman 4x4, 3.73
Blue Ox SwayPro (BXW 1503)
Upgraded from an REI internal frame backpack and a Eureka 1/2 dome tent!