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Roughly 2,700 McKinney housing units were built before 1960, and 1,128 of those before 1940. Central air came to these houses later, sometimes in several stages, and the ducts went wherever there was room.
In a house designed with air conditioning, the ducts follow a plan. In a house that got it decades afterward, they follow whatever the installer could reach. Houses of this age in North Texas were commonly built on pier-and-beam foundations, which leave a crawl space under the floor, so a retrofitted system can run below the house, above it, or both.
It may also have been reworked more than once: a first system in the 1960s or 1970s, an upstairs unit added later, a kitchen addition tied in after that. Sheet metal, rigid duct board and flexible duct can all turn up on one system.
That is why this job starts with a look. Where the ducts run, what they are made of and how well they are joined decide whether cleaning is possible, what tools are safe, and whether some of it should be replaced instead.
An opening in the floor collects what falls into it. Decades of grit, pet hair and small objects sit in the first few feet below a floor register, and that part is easy to clean well.
Old systems leave behind ducts that are no longer connected to anything, some still open at one end. They do not need cleaning. They may need capping.
Old sheet-metal joints were often sealed with tape that has since let go. A gap in a crawl space or attic pulls in dusty air every time the fan runs, and no amount of cleaning cures that. Sealing or rebuilding ductwork is a licensed air conditioning contractor's job.
Wrap and tape on ducts from the middle of the last century can contain asbestos. It should not be brushed, cut or vacuumed by anyone who has not had it tested.
McKinney's Historic Overlay District lies between US 75 and State Highway 5. Community Impact reported in June 2024 that work on a property there which is visible from the public right of way needs a Certificate of Appropriateness, decided by the city's Historic Preservation Advisory Board.
Cleaning ducts changes nothing outside. A new dryer vent hood on a street-facing wall, a roof cap or relocated equipment might. If the visit leads to that kind of change, check with the city before it is made. See the Historic District page.
Often, but not before someone has seen what they are made of and how they are joined. The first visit to a house that age is an inspection.
Old duct wrap, tape and some insulation in houses of that age can. Nobody can tell by looking. If a contractor suspects it, the right response is to stop, leave it undisturbed and have it tested by a specialist.
Possibly. Inside McKinney's Historic Overlay District, exterior changes visible from the street go through a Certificate of Appropriateness. Ask the city's historic preservation staff before a new hood or cap goes on an outside wall or roof.
Say roughly when the house was built and when it got central air, if you know. The contractor looks before quoting anything.
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