The first thing an Alfa owner needs to do if they are going to spend lots of time in hot areas as we do (living in Florida) is to add a roof air in the living room. This should have been standard issue from the factory. Our experience has been that once cooled down, our basement unit will keep it cool, but if you let it get hot, or are in full hot sunshine, the basement air alone won’t bring it down. Also, with the tall ceilings, there is more volume of air to cool off compared to most other motor homes of the same length. It’s a trade off I’ll take for the ability to stand up in my motor home and see outside in about 270 degrees through the windows. Another thing I find helps is to turn on the ceiling fans to circulate the cold air if running the basement unit. The idea of “stacking” cold air from the floor up just doesn’t work well to me.