South San Francisco holds about 21,870 households, a modest piece of the service area's 385,472 households this company drives to from its Alameda base. That size matters: it's not a market big enough to carry a crew and a depot of its own, so every opener call here is a trip, not a drop-in. Houses in town went up mostly around 1963, close to the service area's overall median of 1965, which means most garages were built for chain-driven openers bolted to wood jambs, not the steel-reinforced headers newer doors get. When those original units fail now, they fail on hardware two generations behind what's sold today - different rail length, different mounting bracket, sometimes a door too light or too heavy for a modern opener without adjusting the spring first. That's the failure that's actually local: not a weather story, since the whole region sits in the same mild climate band, but an age-of-stock story. A straight swap-in rarely goes in straight.