Yes, the busses are VERY different than the run of the mill RV. Prevost (and others) have a system called Bus Air and it WILL keep the entire inside of your RV COLD (not cool, COLD). This system was designed to keep 50 passengers cool throughout the coach during extended drives. This system also occupies an entire storage bay from side to side and adds extensive components and complexity. It's a whole bunch of money and some of the Prevost RV's use(d) this system. It is such massive over-kill for what we use and what we need that it is a pretty rare option even in the 1,000,000 buses.