After July 3, 2019, residential furnace manufacturers must include energy-efficient electronically commutated low-wattage motors (ECM’s) on their furnace fans, instead of the permanent split capacitor (PSC) induction blower motors normally used. The Department of Energy (DOE) has updated their Furnace Efficiency Rating (FER) standards, mandating that these energy conserving motors be used starting July 3, 2019 in all new furnaces, … Read More