Cold-climate winters do their worst work on hardware that's already older than the regional average, and Carpentersville's stock skews that way. A torsion spring rated for 10,000 cycles when it was installed around 1977 has likely seen close to that many open-and-close cycles by now, and steel fatigues faster once temperatures swing hard through a Chicago-area winter. The moderate-cold band this area sits in means repeated freeze-thaw on the slab, which shifts the track alignment on doors that were never engineered with today's insulation standards. Add in that median household income here runs lower than the surrounding towns ($86,327 versus $111,898 across the wider area), and a lot of owners have been deferring the opener upgrade or full replacement that newer-built suburbs handled years ago. That combination - older hardware, harder winters, deferred maintenance - is exactly why a spring failure in this town tends to arrive without warning.