Coldfront
Addicted to ArboristSite
The modern expectations of what constitutes a properly heated home (high, constant, even temperatures) are not the same as they were when Victorian homes were built, nor are the insulation or heating systems. Victorian-era homes were really the first to have heating systems at all, but they were not as effective as modern systems and expectations were not the same either. Later in the 20th century it didn't matter how well insulated or sealed a structure was, because you could just throw unlimited amounts of energy into it and heat it anyway.
Trying to make a solid construction structure well insulated without major alterations is tough. We have not bothered with our (even older) home - it is decently sealed and there is insulation in the attics, but we have tried to adjust our expectations of what is really needed in regard to heat. So some rooms are hotter and some rooms are colder, and it varies over time. If you are cold you can always put on something warmer, and usually move to a warmer room. Adjusting expectations is a heck of a lot cheaper.
Just think about those who lived in stone castles with only huge fire places. We want it 70° and we want it now!