I would seriously consider replacing all the duct work with new
higher R-Value duct work. My local home depot has several choices
for R-value for their flexible duct. Spend some money now and with
gas prices tripling, you will be handsomely repaid.


The furnace you choose will have specific venting requirements so
just read the documentation that comes with the furnace. Many of the
furnace installation docs are online so check their web site.





On Thu, 6 Oct 2005 20:19:25 -0600, Christian Fox
wrote:

Hi,

I'm planning on getting a high-efficiency natural gas-fired furnace to replace our
current 15-year old standard-efficiency furnace within the next year or so.

I've heard that the high-efficiency furnaces require different ducting, and use a vent on
the side of the house rather than a chimney as an exhaust.

Our current furnace has two insulated ducts going to the side of the house, and the
chimney running to the roof. If I get a new high-efficiency furnace, is it likely that
the ducts to the wall will need to be changed?

The reason I ask is that I'm considering finishing my basement, and if I do the ducts
won't be easily accessible. If the ductwork will need to get changed or replaced, I'd
rather do that before finishing the basement ceiling.

Thanks in advance for your help!

Christian Fox