On Mon, 04 Dec 2006 13:29:21 GMT, "peter" wrote:

I have several rooms in my house that I don't have to use, so I close them
off and shut off the heater registers in those rooms to save energy.
However, this causes the remaining registers to become very windy and noisy.
I believe the reduction in air flow also increases the furnace output
temperature and therefore increases heat loss while the air is traveling in
the heating ducts in the crawlspace. Also air is lost due to leakages in the
heating ducts -- my crawlspace is warmer than outside by at least 10
degrees.

Is it generally possible to lower the heat output of a furnace? This is what
I have (replaced last year):

http://216.122.22.11/FetchDocument.a...3-559b84978136

I see three burners inside. I can either pull out one of the burner, or use
the shut-off valve to reduce the gas supply. I imagine removing one burner
would be more efficient since the remaining two burners will operate at
their designed setting.

But I'm not so sure the blower speed can be change. I don't mind rewiring
anything if I know it can be done.


If you're willing to screw around with the furnace, you ought to
be willing to modify the ductwork.
If the furnace isn't short-cycling because you're not moving
enough air to keep it cooled down, AND if the noise you're
hearing is being generated at the grilles, you might be
able to reduce the noise just by stepping up a size and
using bigger grilles. Otherwise,
Add more duct and registers to the rooms you ARE using, to
make up for the amount of air that you're no longer moving through the
closed rooms.