Armstrong now offers the Design Envelope IVS twin vertical inline pump for commercial HVAC systems. The pump combines two variable-speed rotating assemblies in one shared casing. The pump design is a variable-speed, duty/standby solution for any application that demands constant availability, energy savings and a small footprint. The pump also employs sensorless technology, which provides increased overall efficiency, matching pump operation to the demands of the HVAC system more accurately than industry-standard remote sensors.