There are too many RV air conditioners to sort through easily.
So RV52.com has made this handy dandy traditional cooling only RV air conditioner selection guide to try to make it easy to find the air conditioner that you need.
However, even at this level (Cooling only RV air conditioners) there are still too many to look at. So lets break the problem down to the next level.
Probably the BIGGEST decision from here is the overall cooling power you will want to purchase. I vote that bigger is better, but that is just me.
Learn the major parts & selection criteria for an RV air conditioner here.
Step #2: Select the cooling capacity in BTU (Bigger is better)