A variable-speed furnace offers more comfort, increased energy savings and greater longevity than a single-stage heating system. The term “variable speed” refers to the motor inside the air handler that powers the fan. These types of motors embed the most advanced motor technology available in residential HVAC systems. Variable-speed motors are actually electronically-commutated motors (ECMs), and use electricity differently than the more common permanent split capacitor (PSC) motor used in HVAC systems. ECMs use inverters to change the power from […]
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