Air duct cleaning in Rectortown.

A village laid out in 1772 wasn’t planned around ductwork. Among the 54 properties in the state’s survey of Rectortown, the likeliest to have been built with ducts are the newest few: a stuccoed concrete block house from about 1950, block ranches from about 1958 and 1965, a brick Colonial from about 1988 and a frame house from about 2000. In those, the runs are usually original, and the camera tends to find whatever decades of filters let past.

The older houses got their systems later, and the ducts went where the house let them: a trunk along the cellar ceiling, branches cut up through century-old floors, sometimes a second system in the attic. Other houses never got ducts and heat and cool room by room with ductless heads, which have nothing for a duct brush to do. If there are no grilles in your floors or walls, this isn’t the service you need.

Where there are ducts, they get used. The Warrenton 3 SE weather station’s 1991 to 2020 normals come to about 4,685 heating degree days a year against about 1,018 cooling degree days, so heating outweighs cooling more than four to one. Close to two thirds of owner homes in ZIP 20115 heat with electricity, usually a heat pump out here, and its blower runs long, steady cycles all winter, pulling room dust toward the returns.

The register describes the village as surrounded by open farmland, and the old station building by the tracks spent decades as part of a farm center selling implements. Field dust finds the return grilles, and where ducts run under the floor, a field mouse hunting for a warm winter can find a way in too. The camera shows whether something is living in a run before anybody quotes a price. Adding the dryer vent cleaning to the same visit makes it $199.