Edina's housing runs mostly 1960s and 70s construction, with the broader range spanning 1957 to 2005 and a median build year around 1975. A torsion spring has a rated cycle life, and a door installed when a 1975-built house was new has had five decades to burn through those cycles even with light use. That's the mechanical half of it. The other half is the climate band Edina sits in, which runs severe cold. Steel that flexes fine at 70 degrees gets brittle at 10 below, and a spring already near the end of its life is far more likely to snap on a hard cold morning than on a mild one. Put those two things together, aging hardware and sharp winter cold, and you get a pattern: a noticeable jump in spring failures and cable snaps every winter, concentrated in the same decades-old housing stock that makes up most of the area.