Sorry Kevin, what you pay for, is Kilowatts, or power, which is volts X amps. At higher voltage, the motor will run cooler due to lower amps. Our controller only affects the motor operation, not the heater. The controller will lower the motor load and make it run cooler & smoother. The amount of savings varies by application. Let me know what amps the motor takes on high & low voltage, and I will recommend a controller. We also have units for central AC compressors, window units, and motors all the way up to 500hp & bigger. Please let me know if I can help. 800 851 9891. Thanks, Brian.