By "controller" do you mean the thermostat? If so, I don't think it has such a setting.
Question: It does have both "on" and "auto" fan settings. If I set the fan to "on" would the AC unit (i.e. the chiller) run constantly or just the fan? Seems to me if I can set it to where the fan runs but the chiller only comes on when the temp drops below a certain level, that should help even out the temp in the house, right?
Then the next question is, is the fan a big power draw? I know the chiller is.