It's a remarkably poorly insulated 5 bedroom home with a purely global temperature control (i.e. she can't just cool / heat her bedroom). I gave her a bunch of money to do renovations so hopefully that goes down significantly.
That makes sense. You can find old homes in SF with the natural gas heaters and it's easy to get a big gas bill if you leave those on with the terrible windows that don't close properly (the windows on those old victorians are awful).