Joe,
Steve knows far more about these things than I do but that freezing over isn't right either. We had one small unit burn up in one of the computer offices because of that and mine here at home never has any ice on the coils as it has some kind of electronic detector that keeps it off. Same when it is on the heat cycle in the Winter. When the detector sees ice forming, it shuts the unit off and runs off the heat strips while it defrosts the unit. And as for the adding freon, mine is about 15 years old and in all that time they have topped it off twice with just about 1/4 pound.
Ron
