We currently own a 2003 Tiffin 37 ft Allegra Bay gas motorhome. We will be downsizing and are researching the class C 28/30 ft motorhomes. However, we noticed there is only one a/c on all size class ...
We have a 31' Itasca with one A/C and use it all summer in Arizona. I think as long as it is the ducted type it will be fine. We look for shade when ever possible and have window awnings on every window too. Works OK for us. Does run a lot though! We had a friend whose RV cooled from only one place in the ceiling and it didn't work quite as well as ours.