North Branford's houses cluster around a median build year of 1977, which puts the town near the tail end of the broader 1954-1986 range across the service area but still squarely in the era of torsion springs on side-mounted hardware. Steel spring fatigue is a known problem under sustained cold load, and this region sits in a severe cold climate band - winter temperature swings stress the coil on a 45-year-old spring in a way that a mild climate wouldn't. That combination, 1970s hardware plus genuine cold, is what actually brings most North Branford calls in: a spring that's been cycling for decades finally lets go on a January morning, usually with the door halfway up. Second most common is the roller and track wear that comes with age rather than a single event - nothing dramatic, just steel that's done its 10,000 cycles and is due.