A variable speed blower is an indoor fan motor that can change its speed incrementally to provide a constant flow of air. Unlike standard motors that are either full-speed or off, variable speed motors can ramp up and down slowly, which is much quieter and uses less electricity. This feature is standard in our high-end multi-position air handler units. It significantly improves humidity control by allowing the air to spend more time over the cold coils at lower speeds. You can find these advanced blowers when you shop all ducted options on our site. They are a hallmark of the Cooper&Hunter and ACiQ lineups.