An electronic motor running at half speed with using roughly 1/8 the energy of a motor at full speed. But conventional motors don't have the flexibility to adjust their speed. They either run at full speed or not at all. With Honeywell variable frequency drives motors run and only run as fast as required by the job at hand and only when needed. When Honeywell variable frequency drives were installed at Northern Trust corporation headquarters in Chicago energy consumption dropped more than 30 % saving roughly $10,000 a month during the summer