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Posted by Parsons@datasync.com on July 15, 2005, 2:43 pm
I am doing a renovation in New Orleans on a raised house ( 3' )with 11
foot ceilings . The Hvac sub is sugesting that we run our ac and heat
vents up from the floor with what he calls a downdraft system. The
house presently has duct work in the ceiling, but it would simplify my
modifications if I could run the ductwork from below. I think the
homeowner will benifit as far as heating goes but I have concerns about
the cooling. We run AC here for sometimes 8 or 9 months of the year and
I would hate to be setting the homeowner up with a system that will be
a problem for him . If anyone has any advice that might help me make a
decision I would appreciate it. thanks
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Posted by tbasc on July 15, 2005, 3:31 pm
Parsons,
I live in Charleston SC - hot and humid.
My first floor has 12'-0" ceilings and air comes from the floor and is
exhasted near the ceiling.
It has worked well for 27 years.
Ducts here are run both in the attic and in the crawl space.
Neither system seems to have an advantage when well designed.
With a 3'-0" crawl space in N.O., I would think about moisture / water
infiltration.
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Posted by HeatMan on July 15, 2005, 7:09 pm
In a perfect world, all heat would be in or near the floor and the cooling
would be in or near the ceiling.
show/hide quoted text
> I am doing a renovation in New Orleans on a raised house ( 3' )with 11
> foot ceilings . The Hvac sub is sugesting that we run our ac and heat
> vents up from the floor with what he calls a downdraft system. The
> house presently has duct work in the ceiling, but it would simplify my
> modifications if I could run the ductwork from below. I think the
> homeowner will benifit as far as heating goes but I have concerns about
> the cooling. We run AC here for sometimes 8 or 9 months of the year and
> I would hate to be setting the homeowner up with a system that will be
> a problem for him . If anyone has any advice that might help me make a
> decision I would appreciate it. thanks
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Posted by nicksanspam on July 16, 2005, 7:34 am
>In a perfect world, all heat would be in or near the floor and the cooling
>would be in or near the ceiling.
Nonono. In a perfect world, all heat would be in a hot massy low-e
ceiling and all cooling would be in a cold slab floor, with ceiling fans
to bring down winter heat and bring up summer cooling in occupied rooms,
as in the Barra system.
Nick
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Posted by HeatMan on July 16, 2005, 10:46 am
show/hide quoted text
> >In a perfect world, all heat would be in or near the floor and the
cooling
show/hide quoted text
> >would be in or near the ceiling.
> Nonono. In a perfect world, all heat would be in a hot massy low-e
> ceiling and all cooling would be in a cold slab floor, with ceiling fans
> to bring down winter heat and bring up summer cooling in occupied rooms,
> as in the Barra system.
Okay, how come it's always warmer near the ceiling and the upstairs of a 2
story house?
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> foot ceilings . The Hvac sub is sugesting that we run our ac and heat
> vents up from the floor with what he calls a downdraft system. The
> house presently has duct work in the ceiling, but it would simplify my
> modifications if I could run the ductwork from below. I think the
> homeowner will benifit as far as heating goes but I have concerns about
> the cooling. We run AC here for sometimes 8 or 9 months of the year and
> I would hate to be setting the homeowner up with a system that will be
> a problem for him . If anyone has any advice that might help me make a
> decision I would appreciate it. thanks