The cold air at turn-on is leak-through of the 1" (down here) of insulation that surrounds the ducts......not much insulation considering your walls with 2x4 studs have 3 1/2" and your attic 6" or more.
Ducts may not look like it, but the surface area exposed to the cold in the attic for 1' of 13" duct is 3.4' so just a 10' duct run is 34 square feet of area exposed to the cold. That's 5' of wall equivalent with an 8' ceiling for just a 10 ' run of duct. Gonna bet a 6 room house has more like 20' per room for 120' total duct run, obviously some ducts larger, some smaller, exposed with only 1" of insulation.
Leaving the blower on, not only keeps the room temp averaged out, it also keeps the ducts warmed up to the average temp of the rooms so no cold starts.
Additionally leaving the blower on keeps the temperature passing the thermostat at more of an even level meaning that you don't have these big changes in room temp before it kicks on.
The amount of electricity to run the blower is nil. Down here for a quick example, a 2 ton (24,000 BTU AC/80,000 BTU furnace) unit runs a 1/3 hp blower. Throw in some efficiency numbers and that's about 1/3 of a kilowatt hour per hour plus losses for about 1/2 kWHr/hr.
Currently paying 13 cents per kWHr at my house. So 7c x 24 hrs x 30 days = $5 per month. But wait. Subtract out the time the blower runs anyway and it's maybe half that.
So, as I see it the "efficiency" setting you see on things like air conditioners where the fan is off is an absolute joke. What do you do to stir the air up.....turn on the ceiling fan......what did you gain?
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Today's Featured Article - The Day Mom Drove the 8N - by Brian Browning. My Dad was wanting to put in a garden but couldn't operate the 8N and handle the old horse drawn plow he had found and rigged up to use with the tractor. Well, he decided to go get Mom out of the house and have her drive the tractor while he walked behind the plow. You got to understand that while my Mom is a hard worker who will always help whenever she can... she had never operated farm machinery before that day. Dad got her out there, explained how the clutch was the same as in our o
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