the new units have a diff Freon in them as apposed to the say '08 units and DO NOT cool as well as the older ones but I have a 2011 wp 295 with the 13500 unit and once it gets over 95 it runs non stop and doesn't do a great job but does still work. at first it didn't do well but I pulled the cover and could see daylight and the bottom side of the ac cover through the 5 spots they didn't get sealed up so the return air it was pulling in to cool was partially being drawn from the attic ( so to speak ) and the outside. got it sealed up and worked better.
