[Hugh R]

My uneducated guess is that Milt is on the right track (I know a little about A/C and a lot about mold), a dehumidifier is way cheaper to run as it isn't "pushing" air through vents. A centrally located dehumidifier to keep humidity down is what you want in a place like Georgia. You need a way to drain the condensate out of the collection basin, otherwise you'll get mold from the standing water, which could overflow into the house if not drained away.