"Christian Fox" wrote in message
...
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.



Generally you can use the same duct with a high efficiency furnace, but that
is not saying your current duct work is correct!
Get someone in the trade to look over you ducts and give you an evaluation.
Greg