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+2 from me and DH. 
I live in a 300 year old farmhouse, 2500 sq. ft. Houses were built with slightly more thermal mass in the early 1700s, so my heating bills aren't quite so bad as all that, not if we run the woodstove religiously. But in winter, the master bedroom and the den are the furthest from the woodstove, and waking up at 5am to frost inside the windows, and lukewarm coffee because the coffeemaker can't keep it warm enough...not fun. The main thing is that you have to be handy around the house. 100 years old isn't so bad, but contractors out and out refuse to work on my house, sometimes for any money, sometimes for less than six figures. I think that was what surprised me most, that lots of contractors refused to work on it because of the age and because it would require an actual engineer's plans working to blueprints rather than to the regular building code. So, be prepared to do a lot of repairs on your own. I think I spent about $1000 on power tools so I could do my own repairs, till all was said and done. I hired the plumbing and electricity done by pros, but DH and I do all the finish and basic carpentry ourselves.