Armstrong Fluid Technology introduces a circulator featuring Design Envelope technology. The Compass Circulator helps contractors and wholesalers with easy selection, fast installation and broad performance capabilities for a wide variety of installations. It also helps reduce energy consumption and operating costs. In auto mode (one of eight operating modes), the circulator adjusts operating speed to match HVAC demand at any given moment. Over time, the circulator learns a system’s patterns of demand and appropriately adjusts output to further reduce energy usage.