You are correct that as built, the older homes used a bit more electricity and gas. But minor retrofits such as added attic insulation and insulated windows can go along way without a tremendous cost. Also keep in mind that every tradesperson must be licensed….another layer of cost vs. a Jack of all trades type that could do the same quality work for less than half the cost. I could build a 1200 s.f.home for $100,000. And it would meet the code. But I’m not “allowed” to do it. And there are others I know that could do the same.

You are correct that as built, the older homes used a bit more electricity and gas. But minor retrofits such as added attic insulation and insulated windows can go along way without a tremendous cost.