Air Conditioners ACST Series - Standard Series Using R22 Refrigerant System ACST-09 ACST-12 ACST-18 ACSTA Series - Enhanced Series Using R410A Refrigerant System ACSTA-09 ACSTA-12 ACSTA-18 ACSTAV Series - Inverter Series Using R410A Refrigerant System ACSTAV-09 ACSTAV-12 ACSTAV-18