Vancouver sits in a mild band with occasional freeze, not the hard winters you get east of the mountains, but enough cold snaps to matter. A torsion spring that's fine in August can bind up on a 28-degree morning because the metal contracts and the lubricant thickens. We see this most on doors that haven't been serviced in a few years - the spring still has life in it, but the cold exposes slack in the cable drums or a track that's a hair out of plumb. Moisture is the other half of it. We don't get the deep freeze-thaw cycles that crack concrete the way colder regions do, but the damp stretches here are long, and steel sections without a good coat of paint start showing surface rust at the bottom panel first, where splash-back from the driveway hits it. None of this is dramatic. It's slow wear that shows up as a louder door, a slower open, or an opener that strains on cold mornings. A service call in this climate is mostly about catching that wear before it becomes a snapped cable or a stuck panel, not about storm damage, because that's not really what this area throws at a door.