Ok, this was like 3 years ago, but last I remember was my mom complaining about the bill on her house... $700!
This is a big house built in 1837 with a boiler system that was installed in 1904. The system was coal, but converted to oil, then nat'l gas in the 70s.
None of the windows/doors were upgraded, so they all leak BAD.
Coolest thing about the house is that everything is still level and square... I'd say pretty quality on a nearly 170 year old house!
I almost wanna buy it off her and fix it up.