It's a big old two story, double brick house without any insulation in the walls for the most part except for the couple of rooms that we stripped back to the brick and sprayed on urethane before re-drywalling them. The original walls have a 1 1/2 inch airspace between the brick and the plaster and lath. About a foot of blown-in in the attic for insulation.
It's about 28' x 44' x two stories with a mostly in-ground unfinished full basement. Probably about 80 or 90 years old. iI've lived in it for 45 of those years, moving into it in '64. With the improvements we've made to it, we burn a lot less wood than we used to and it's much warmer than when mom and dad were still here.
I corrected my first post to say 16" wood rather than 16' wood.

16' wood would take a big furnace, wooden it? :wink: