Coldest day of the year is also why I think this furnace is way oversize.
When it was 25°F below zero and 30-40 MPH wind with a wind chill of near -60°F this furnace had no problem with the 10°F night time setback to raise the house temp 10° in under 15 minutes.
There pros and cons to any age of house. That is why there are so many to choose from. After watching my 2 sisters and what they went thru building their houses, by the time the house was built I would not need a house Cuz I would have already killed the contractor.....
There are many features of this house that I really like that you will not have in new construction. On the other hand there are some things that were really done in a way as to be only aspiring to get UP to half A$$. Yes over the years I have had to do a lot of fixing of things, with more yet to fix.