No gas main serves Casanova. In ZIP 20119, the Census area it sits in, about half of owner homes heat with electricity, close to three in ten with propane, and none with utility gas, so a dryer here is electric or propane. Both need air moving through the line, and a load that takes two cycles is the dryer vent cleaning’s cue.
Propane changes the exhaust. A propane dryer’s flame burns inside the cabinet, and what that flame gives off rides out through the same duct as the damp air and the lint. An electric dryer has no flame, but a packed line can overheat its element until a safety switch cuts the heat. Both are reasons for a camera in the line first, so you see the lint instead of guessing at it.
The Warrenton 3 SE normals count about 98 nights a year at or below freezing, a January average low near 25, and about 13 days a year when the high stays at or below freezing. Dryer exhaust is warm and wet, and when it meets a cold hood or a cold run through a crawl space, the moisture condenses and lint cakes on whatever it lands on. A hood flap frozen shut with lint holds the exhaust back inside.
More than four in ten owner homes in the ZIP predate 1980, and the village’s frame houses are older still, built before anyone owned a dryer. Where one was added later, its line can run out through a foundation wall or along a crawl space, longer and with more turns than a modern laundry room needs. The camera photos show the whole route, so you know where the lint settles.