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Posted by Zack on February 4, 2007, 10:17 pm
Hello,
I am going to be getting a new furance soon. The companies I have had give
me estimates are pretty close together. Two of the three companies told me
I should have my 35 year old metal ductwork replaced with fiberglass panel
ductwork. I am told this will keep the air hotter in the ductwork and save
engery. Apparently 10-15% of the heat in the air will be lost if I keep my
existing metal ductwork. The cost for replacement is not really large, but
is it a good idea?
Thanks,
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Posted by on February 4, 2007, 10:52 pm
> Hello,
>
> I am going to be getting a new furance soon. The companies I have had give
> me estimates are pretty close together. Two of the three companies told me
> I should have my 35 year old metal ductwork replaced with fiberglass panel
> ductwork. I am told this will keep the air hotter in the ductwork and save
> engery. Apparently 10-15% of the heat in the air will be lost if I keep my
> existing metal ductwork. The cost for replacement is not really large, but
> is it a good idea?
>
> Thanks,
If the metal ductwork is insulated you loose some initial heat in
heating the metal duct , like you would loose heating the fiberglass.
After that it wont matter. If the duct is NOT insulated you have a
radiator heating your attic space , or wherever the duct runs .
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Posted by Joe on February 4, 2007, 11:02 pm
> Hello,
>
> I am going to be getting a new furance soon. The companies I have had give
> me estimates are pretty close together. Two of the three companies told me
> I should have my 35 year old metal ductwork replaced with fiberglass panel
> ductwork. I am told this will keep the air hotter in the ductwork and save
> engery. Apparently 10-15% of the heat in the air will be lost if I keep my
> existing metal ductwork. The cost for replacement is not really large, but
> is it a good idea?
>
> Thanks,
No. Or Maybe. If your metal ducts are exposed to the outside there can
be some heat losses to that environment. However, if the ducting runs
in a basement it effectively supplies heat there so the loss is
actually recovered. Even ducts in walls will radiate their 'lost' heat
back into the room. Conductivity through fiberglass is less than
metal, but not that significant. If you have had problems heating some
rooms, then fiberglass to those areas may improve things, but I
wouldn't expect any dramatic savings, just improved heat distribution.
Buy a Trane system from a competent installer and you will be well
served for a long time. HTH
Joe
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Posted by Goedjn on February 5, 2007, 1:07 pm
wrote:
>Hello,
>
>I am going to be getting a new furance soon. The companies I have had give
>me estimates are pretty close together. Two of the three companies told me
>I should have my 35 year old metal ductwork replaced with fiberglass panel
>ductwork. I am told this will keep the air hotter in the ductwork and save
>engery. Apparently 10-15% of the heat in the air will be lost if I keep my
>existing metal ductwork. The cost for replacement is not really large, but
>is it a good idea?
Is the ductwork running through unheated spaces? If not,
it doesn't matter how much heat you loose through them.
If so, burrying them in insulation should work as well as
replacing them.
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Posted by on February 5, 2007, 8:33 pm
If you live in an area where frozen pipes are likely, it may be a bad
idea to insulate ducts in a vented crawlspace. It seems to me that a
cooler crawlspace increases the likelyhood of frozen pipes.
I'm not a plumber or an HVAC guy though, so I might be completely
wrong.
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