If you own an older home, you must understand that they come with some idiosyncrasies of their own.
Some of those things can be solved while others simply have to be accepted or managed.
I have been in my house for just over 5 years now. And there had been an HVAC situation that I just couldn’t figure out. Initially, I thought it was just me. We moved to the north and it was my first time experiencing a serious winter. The heater ran nearly non stop that first winter. The heating costs were extreme that first year but the house never seemed all that cozy. I quickly learned that, especially with an older structure, it is imperative to have a sealed up home. This keeps much more of that gas furnace heating inside the house and really lowers the heating costs. The second year was better. But in another way, it was still sort of the same in one part of the house. A section of the house is always colder in the winter and warmer in the summer. I thought this might be due to the fact that it’s sort of the end of the house. The HVAC professional told me that while this was a factor, it had more to do with the addition of some interior walls. The HVAC technician suggested that I use room to room ventilator fans to equalize the HVAC heating and cooling. I did just that and inserted these small fans in the adjoining walls in that section of the house. Now, it’s much, much better because the heating and cooling air flow is now balanced.