Variable frequency drives (VFDs), also known as variable speed drives (VSDs), are used to modulate the speed of motors in various applications, from hydronic water pumping to VAV fan units to vacuum ...

Variant refrigerant flow technology is designed to give building occupants more comfort and more energy-efficient control via zoning. Supported by integrated controls and sensors, VRF accomplishes ...

Fixed rate electric plans offer convenience, protection and predictability. Variable-rate plans offer flexibility and the potential of savings. Here's how to know which is better for you. Stephen J.