Unlike conventional PSC motors which are designed to run at 1 speed, an ECM variable-speed motor can run at a wide range of speeds to precisely deliver the exact airflow required to heat or cool the home to temperature called for by the thermostat. Typically, an ECM motor will turn on and gradually increase the speed of the fan as more air is called for, and decrease the speed as target temperature is close to being met. Additionally, variable-speed motors are much quieter than conventional motors and improve air circulation which results in reduced temperature swings, greater indoor comfort and significant energy savings.Unlike conventional PSC motors which are designed to run at 1 speed, an ECM variable-speed motor can run at a wide range of speeds to precisely deliver the exact airflow required to heat or cool the home to temperature called for by the thermostat. Typically, an ECM motor will turn on and gradually increase the speed of the fan as more air is called for, and decrease the speed as target temperature is close to being met. Additionally, variable-speed motors are much quieter than conventional motors and improve air circulation which results in reduced temperature swings, greater indoor comfort and significant energy savings.

A PSC motor is designed to more simply turn on and turn off. The output of a PSC motor is isn’t controllable and it has no intermediate speeds, which means it’s either running at it’s full output or isn’t running at all.