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A Variable Frequency Drive (VFD) is an absolute energy-saving necessity when it comes to HVAC applications like fans and pumps. It is a type of motor controller that drives an electric motor by varying the frequency and voltage supplied to the motor.

ABB VFD’s can pay for themselves in as little as a few months, and can save thousands of dollars over their lifespans.

Other names for a VFD are variable speed drive, adjustable speed drive, adjustable frequency drive, AC drive, and inverter.