I know the initial post asked about how they worked when not hooked to power, so I spoke to that.
Regarding when I was hooked to power, the AC worked well even in the heat of NC summers. I will even add, that on the A-Liner I had, i could run the AC with the dormers up. This left you a fair amount of canvass as your only insulation. During the heat of the day, I would close the dormers, so as to have only hard sides. At night, it was very comfortable with the dormers open.
I was very happy with the A-Liner. The only reason I went bigger was for a true, full size bathroom and a walk around queen bed.
2015 Everlite 24RBS
2013 Ford F150 3.5L Ecoboost