Q: Best place to buy metal ducts for HVAC?
 

X wrote:

I have some old 7" & 8" ducts on my forced air gas furnace that need
replaced. They are old and rusty, and some have been wrapped with
asbestos. I also want to rebuild the cold air returns while I'm at it.
The cold air returns were built using the floor joist to box them in.
I'm planning on using either aluminum, or galvanized metal for the
cold air returns.

Where is the most inexpensive place in the U.S. to buy new duct work?
I've seen ducts that were installed with an insulation wrap on them,
and I'd prefer this type if available.

My current furnace is a 1985 model. If I buy a new furnace will I need
to recalculate the size of the cold air returns or will they be about
the same size for the new furnace? Thanks, -Steve


I would stay with the insulated metal ducts, flex duct has more
resistance and other problems.

The duct system may not have been properly sized for your old furnace,
so start over and refigure the entire system using the data on your new
furnace.
For the needs of your present or future air conditioner, a little over
sizing of the ducts is better than under sizing them.
I would also have a manual J and D done so you know what size A/C and
furnace you need for optimal efficiency of operation. -D.

--
Air Conditioning System Sizing for Optimal Efficiency -
http://www.udarrell.com/airconditioning-sizing.html

Q: Best place to buy metal ducts for HVAC?
 

"'nuther Bob" wrote in message
...
My current furnace is a 1985 model. If I buy a new furnace will I need
to recalculate the size of the cold air returns or will they be about
the same size for the new furnace?

A professional HVAC contractor can figure this out for you. If you
plan to replace the furnace, I'd skip the duct work you mentioned
and start there. BTW - unless that furnace is having problems, a
mid 80's 80% efficient unit is not too bad. It will be a long time
before a 90% efficient unit will have any payback - and by then
it will need replacement too. Don't fix it if it ain't broke.

Bob

Awwwwww......Depending on the OP's location that 90-92% furnace can/will pay
for itself.

It all depends.

--
kjpro
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( kjpro @ starband . net ) remove spaces to e-mail

Want it done yesterday? Or done right today, to save money tomorrow!!

_________________________ __

Q: Best place to buy metal ducts for HVAC?
 

"'nuther Bob" wrote in message
...
My current furnace is a 1985 model. If I buy a new furnace will I need
to recalculate the size of the cold air returns or will they be about
the same size for the new furnace?

A professional HVAC contractor can figure this out for you. If you
plan to replace the furnace, I'd skip the duct work you mentioned
and start there. BTW - unless that furnace is having problems, a
mid 80's 80% efficient unit is not too bad. It will be a long time
before a 90% efficient unit will have any payback - and by then
it will need replacement too. Don't fix it if it ain't broke.

Bob

Awwwwww......Depending on the OP's location that 90-92% furnace can/will pay
for itself.

It all depends.

--
kjpro
_-~-__-~-__-~-__-~-__-~-__-~-__-~-__-~-__-~-__-~-__-~-_

( kjpro @ starband . net ) remove spaces to e-mail

Want it done yesterday? Or done right today, to save money tomorrow!!

_________________________ __