How much is your electricity where you are? Here in Calgary, Alberta
I pay 7 cents per KWh. Fan may draw 1.0 amp or so whcih leads to ~100W
You do the rest of math. Also that'll suck out some warm air from your
house which may cause more heater run.



I live in Los Angeles, so heat isn't too much of an issue. The
basement where the fan is isn't even heated.