On Apr 29, 8:45 am, ransley wrote:
On Apr 29, 4:53 am, "Buck Turgidson" wrote:

Is there an average life that one can expect from a gas furnace? I have a
furnace that is at least 20 years old, and the exhaust motor is making the
same noise as the last time, when it needed replacement. That was a few
hundred dollars.

So, I am wondering if I should just replace the furnace with something more
efficient, rather than sink money into it. As I understand it, furnaces of
this vintage are only about 60% efficient.

Why not run efficency numbers to help you decide they go to 96% and
VSDC motors save about 1/3 in electricity.

Don't know what vintage you are talking about, but I've never seen a
furnace with an exhaust blower that was only 60% efficient. Even a
run of the mill, cheap gas furnace has been 80% for decades. And
they have a lifespan of about 25 years.