But then I moved to the suburbs to a boring 1980's ranch house a bit more than 2x the size and watched my heating & cooling bills drop to less than half what they were before. Charming as the Mpls house was, its HVAC costs were insane (since it was my first house, I had no frame of reference). There's a lot to be said for thick insulation and modern windows.
I live in an even larger house now, with a largely glass east-facing wall and my heating bills are about the same as the second house. Again, modern insulation & 12" thick walls makes a huge difference.
You can get insulation put in without doing so. I think it's called retro foam. Also I'm guessing your attic insulation wasn't top notch?
What's sad is that swaths of the worst of north Minneapolis are architecturally identical to my neighborhood, but they're worth half as much and the whole area is in deep decay.
The house has a foundation that's 3 foot of mixed limestone chunks. The walls are made of 2x4s but the lumber is old growth trees --driving a nail into it is significantly harder than something you'd get at Home Depot.
The interior woodwork is the real gem. It makes the house special. 12 inch baseboards with a chair rail. Ornate headers on the doors and room transitions. I had to replace a few sections when moving some walls around and it cost a small fortune to get replacement pieces. I can't imagine doing it to a new build. I also can't imagine being excited about moving into a new place with trim that is made out of some composite material.
It's a simple, efficient design that I've appreciated more lately with these "McMansion" posts.