Across the roughly 7,500 households and 3,810 owner-occupied houses we see in this area, the bulk of the housing stock dates to the 1980s and 90s. That's not an accident of one neighborhood - it shows up in Orchard Homes, East Missoula, the Wye, Lolo, and most of the other named areas we work in. Doors installed during that building boom are now well past the 15-20 year mark where torsion springs typically start to fatigue and die.
The cold-severe climate here compounds it. Steel springs and cables lose flexibility as temperatures drop, and the oil-tempered coils inside a torsion spring are under constant load even when the door is closed. Cold makes that metal more brittle right when it's working hardest - which is exactly backwards from what you want. Nylon rollers crack. Lift cables fray at the drum where repeated cold-flex concentrates stress.
So you end up with a predictable overlap: aging hardware from a specific building era, sitting in a climate that accelerates wear on exactly the parts most likely to already be near failure. That combination is why repair calls here cluster hard in the cold months, and why the same rough vintage of door shows up again and again on our service board.