I'm planning on getting a high-efficiency natural gas-fired furnace to replace
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
chimney running to the roof. If I get a new high-efficiency furnace, is it
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
won't be easily accessible. If the ductwork will need to get changed or
rather do that before finishing the basement ceiling.
Thanks in advance for your help!