This heat is murder on those aur conditioners!

_I've been looking at a lot of air conditioners.  Just a couple of tips that could save you some money.  If your ac is freezing up, make sure the fan is on high auto this will allow the air conditioner to control the fan and make it run as efficiently as possible. 
Check inside the return grill.  First make sure the foam filter is clean.  if the filter is dirty the air conditioner won't be able to breath and will start freezing or overheating and shut down. 
Check the coils inside the evaporator (the return air side), make sure there is not a layer of lint and dust over the coils.  This will certainly cause the ac to overwork and if it can't breath it will freeze.  Once a layer of ice starts, it will continue to build until you only get warm air out the unit.  Then when the ice melts it will melt into the inside of the coach.
If you are getting a 20 degree drop from the return side to the discharge side of the air conditioner it is doing all it can.  So on a 100 degree day is you achieve 80 degrees or lower the air conditioner is operating as it was designed. 

Keep them clean and they will work for you, If it isn't keeping you cool, call and I'll see if I can help.