Armstrong Fluid Technology announces that its Design Envelope pumps now are available for use with single-phase power. Ideal for light commercial, residential and industrial applications using single-phase power, the new pumps allow designers, contractors, project managers and building owners to choose the best pumping solution for specific needs. Armstrong now offers a complete selection of high-efficiency pumping solutions to serve a broad range of operating requirements. The Design Envelope features include sensorless variable-speed control, integration of pump and controller, space-saving vertical in-line design, compliance with ASHRAE 90.1 energy efficiency guidelines and flexibility. Design Envelope pumps for use with single-phase power now are available up to 7.5 HP.