So 1 of my roof ac's feel a little weak after running awhile. How hard is it to recharge the roof top? Can you buy a kit to do it myself? How do you know when it is full? Thanks for help.
I am unsure whether some RV shops have the skills to recharge a system that isn't designed for recharge - and I doubt it would be cost effective at any rate.
You should consider cleaning the evaporator and condenser coils as well as the air filter just to make sure you getting maximum efficiency. There are a number of threads discussing how to access and clean the evaporator coils - use the search forum search engine.