Variable Frequency Drives

A VFD is a device that matches the energy the motor needs with the work that is being done. Installing a VFD on an AHU fan allows the VFD to vary the speed of the fan. As the fan slows down, it draws less power than at constant speed, resulting in energy savings.

Many AHU system are engineered for 100% design flow, but many could operate with less flow. For example, fans that are turned down just 10% can save up to 25% in energy costs. In most systems, reducing the speed by 50% can cause a 75% drop in energy consumption.

VFD Devices

for commercial buildings

VFD Devices

Receive up to $300 per horsepower for qualifying VFD systems in commercial buildings. 

Use the lookup tool on the homepage for more specific incentive information. 

Customer Benefits

Air Quality

Reduced energy costs

Air Quality

Reduced fan usage

Air Quality

Long life span

Air Quality

Precise temperature control

Incentive Requirements

Pre-installation Conditions

Pre-installation Conditions

The existing building must have the following characteristics:

  • Heating type is electric or gas,
  • Building operates for equal to or greater than 2,000 hours per year,
  • AHU has a variable flow-based HVAC system (constant volume systems are not eligible),
  • AHU has a constant- speed fan (AHU with variable speed fans are not eligible).
Post-installation Conditions

Post-installation Conditions

The installed VFD application must meet the following requirements:

  • The retrofit adds a VFD and controller for variable-speed fan operation,
  • The VFD is set to trend historical kWh usage, fan runtime and average fan speed, and
  • AHU throttling or bypass devices are removed or permanently disabled