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Re: How Many of You Do This?


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Posted by Texasmark1 on January 07, 2015 at 07:07:07 from (99.197.214.247):

In Reply to: Re: How Many of You Do This? posted by mkirsch on January 07, 2015 at 05:35:27:

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?

That's the way I see it and I'll pay the price.

Mark


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