Housing across this service area went up mostly between 1940 and 2015, with the median build year landing around 1977, and the bulk of it clusters in 1960s and 70s construction spread across the two dozen communities we cover, from Dunn Loring and Wolf Trap out to Mantua and Pimmit Hills. That matters because a garage door system is mechanical, and steel fatigues on a schedule. A torsion spring rated for a certain number of cycles doesn't care how well the door was maintained - it just wears down, year after year, cold snap after cold snap. This area sits in a severe cold climate band, and cold is the thing that turns a spring that's been slowly weakening into one that snaps outright. Steel contracts in the cold, and a spring already near the end of its life loses the little bit of flex that was keeping it together. That's why the calls spike on the coldest mornings, not the mildest ones. It's not bad luck. It's forty-plus-year-old hardware meeting a temperature swing it wasn't built to keep absorbing forever. Original one-piece doors and their matching torsion setups from that era are also a different animal from what's sold today - parts don't always cross over, and that's part of what shapes the repair, not just the failure.