What is the difference between single and variable speed blowers?
A single speed blower only knows one speed during operation. Its either on or off. A variable speed blower will adjust itself to maintain the most efficient airflow. Several factors can determine the blowers speed as follows: Static pressures in the ductwork, compensation for restricted air flow due to dirty filter, blocked return vents, etc. and initial blower settings programmed at installation. Variable speed blowers also aid in humidity removal and Indoor Air Quality by moving air over the filter at a slower rate in turn cleaning the air better.