One of the remarkable improvements to home heating and cooling systems is the variable-speed furnace blower. These blowers use electronically commutated motors (ECMs) that use electricity more efficiently. Instead of using alternating current (AC), the ECMs have converters that change the current to direct current (DC) for greater efficiency. A single-speed motor can use as many as 625 watts per hour, while an ECM uses 100 watts. If you need to replace your furnace blower, these tips can help you decide whether a variable-speed furnace blower can benefit you.
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