We have an old Westinghouse Forced Air Furnace (model FGUB137EG). It's been working fine, with the occasional pilot lighting issues since we moved in 6 years ago. We've been thinking about adding central air conditioning with a heat pump and part of the upgrade would be replacing the furnace, with a new variable blower furnace.

I am trying my best to figure out IF we would save on energy - and heating cost - with the new setup in winters. We are in NYS and the furnace definitely gets its use. Anyway, according to the furnace plate, it's "INPUT BTU/H" is 137,500 and the "BONNET CAP BTU/H" is 110,000. Does that make it this a 110,000 BTU furnace with 80% efficiency?

We would be switching to a 96-98% efficient 100,000 BTU furnace with variable or 2-speed blower, along with a 4-ton 24-SEER heat pump. The cost of the everything is coming to around $13K (including labor), in case you can comment on that as well.