"b&k" wrote:

300,000 btu! wow. my (seemingly little) 76,000 btu furnace kind of keeps our
house warm. where do you live? what are your heating costs? a more modern
furnace may pay for itself in a few years.

About $1600 a year including stoves (2), water heaters (2), and other
gas-fired space heaters (4). It's those last space heaters that make
this not an urgent consideration; the main furnace is just being used
to keep the pipes from freezing.

Don't forget that the 300,000 was probably sized to run with a
convection system, not forced air, and that back in those days the
cost of keeping 4000 sq feet at maybe 75/78 degrees wasn't too much.

Back in the late 80's I calculated the payback period to be about 20
years. I doubt I'll be in the house 20 or even 10 years from now.



FeelFree

To say anything you want.