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1 A proper home air duct cleaning costs anywhere from $400-$1,000, depending on the size of the system to be cleaned, the type of services offered, the regional climate and the level of use the ventilation system gets, the type of materials inside the ductwork and the amount of contaminants (dust, mold, etc.).
I would stay with your central AC system since you already have the infrastructure installed for it. Even if a ducted system has not been used in years, a good cleaning would cost very little ($400-$800). For standard house, the duct are galvanize steel/aluminum and does not have liners. Unless you see a lot of rust or the ducts are falling apart, it is perfectly usable.