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I could imagine possibly fewer "warm up cycles" (which also include having to power on the fan) might save something (as well as lower fan speed=less electricity)...but as others have noted, while its running (esp. lower efficiency furnace) it is drafting exhaust up the flue which can't be good. Based on some randomly googled comments here: ...


In terms of heat pumps, running the external blower faster may reduce i2r copper losses and hysteresis iron eddy current losses. These two losses comprise the magnitude of heat losses. Narrowing that hysteresis loop will: Raise Permeability Lower Retentivity Lower Coercivity Lower Reluctance Lower Residual Magnetism Leading to a smaller Hysteresis loop, ...

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