I was running my Furnace Fan 24/7, especially when I had the AC on during the 'hot' months of June - Sept.
We're in a 3500+ 2 story house built in the mid-late 80's. with 2 story ceilings in the main foyer. I believe the furnace is original.
That was until I was telling my neighbor / wife's cousin about our Hydro Bill for July/August. It was around $380 IIRC for 2 months.
He (who also is a electrician contractor) asked a couple questions, re: fridge in the basement and about the furnace fan. Our fridge was 15+ yrs old, and could barely keep bread frozen. Our fan was on 24/7. He said those were the culprits.
We turned our Furnace Fan to auto, Our fridge died shortly after that conversation, and was replaced by a new one. Our hydro bill probably went down $100 for the next 2 months...
I will know more next year when I have the same months to compare too, but I believe the fan does draw a lot of power.
Panny 47wx52, DMR-e80*C DSR500x2, XBOX 360, Toshiba 26hf84, LG 37LC2D