Johnson Controls introduces its Quantech air-cooled chillers that offer up to 50% annual energy cost savings compared with replaced chillers, have a low lifecycle cost, meet or exceed ASHRAE standards and help earn LEED credits with a low refrigerant charge. The Quantech line includes the QTC2 and QTC3 150- to 175-ton air-cooled scroll chillers and the QTC4 160- to 210-ton air-cooled screw chillers with variable-speed drives.