Home > Homeowners > Products > Furnaces > Select A Model > Echelon™ 9.V and 8.V Series Gas > Variable-Speed Technology
Echelon V Series variable-speed furnaces use an electronically commutated motor (ECM). That means that unlike standard blower motors, the ECM continuously but gradually changes fan speeds. This gives you incredible humidity control, much quieter sound levels, and one of the most energy-efficient furnaces you can buy.
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