Our humidity in the summer when it is hot is generally pretty low -- we're the arid west, at least when there isn't cloud cover. We tend to be humid only when it's cool. So much of the time we'd use this, it'd be pretty dry.
Oh good. I only mention it because I just got back from AZ- and they're in the monsoon right now. My mother's neighbor has a large house that is cooled only by evap and it was miserable in there. Humidity was only 30% but when it's 108-110 it's just no fun at all.