A house built around 1983 almost always came with a torsion spring system mounted on a single shaft above the door, not the older side-mounted setup you'd find on anything from the 1960s. That matters because torsion springs fail differently - usually a clean snap you hear from inside the house, rather than a slow sag. The track hardware from this era is standard enough that we stock the common sizes, but the drums and cable drums on some builder-grade doors from the early '80s were undersized for the door weight, which is a common reason a door feels heavy to lift by hand even with a working spring.
Winters here get genuinely cold - this falls in a severe cold climate band - and steel springs lose tensile strength faster in that kind of repeated freeze-thaw cycling than they would somewhere milder. That's part of why spring failure call volume from houses this age tends to cluster in the coldest stretch of the year rather than spreading evenly across the calendar.