The service area sits in a cold climate band with severe winters, and Elmhurst's older stock takes that harder than newer construction does. A door built in 1964 has gone through roughly sixty freeze-thaw cycles, each one working the bottom seal, the weatherstrip channel, and the steel panel seams a little looser. Extension springs lose tension faster in cold garages than torsion springs do, since the coil itself contracts and expands with the swings between a 20-degree morning and a 40-degree afternoon. On newer doors elsewhere in the territory, built with torsion systems and better insulation, that cycling is less punishing. Here, with original or near-original hardware still in a lot of garages, the cold does more work on parts that were already past their expected life. It's not that Elmhurst gets worse weather than the rest of the territory - it's that the hardware taking that weather is older, and older steel and older springs don't shrug off forty winters the way a 2005 door does.