Quantech QTC2/QTC3 scroll chillers and QTC4 screw chillers with variable speed drives meet/exceed ASHRAE standards. While 15–50 ton QTC2 provides chilled water for all A/C applications using central station air handling or terminal units, 55–175 ton QTC3 offers full and partial load efficiencies that meet/exceed ASHRAE standards and operates from 0 to +125°F. QTC4 (160–210 ton) combines technologies in compressors, heat exchangers, condenser fans, and chiller controls to optimize efficiency.