The mild temperate climate across this part of the service area doesn't rot wood jambs or rust springs the way a harsher climate would, so a 1976 door can limp along on its original hardware far longer than it should. That's the trap. The springs aren't failing from weather - they're failing from age and cycle count, four decades of lifting the same slab, and extension springs from that build era were never rated for the cycle life that torsion systems carry today. Add in a household income around $85,202 for the area, which tends to mean these are owned, maintained homes rather than rentals changing hands every few years - the kind of house where a door gets patched instead of replaced, until the track finally twists or a cable snaps. With roughly 15,011 households in Rowland Heights, that's a meaningful number of garages still running on hardware older than the people living behind them.