The People Behind the Work

Some duct cannot be cleaned. We say so on site, before anything gets unloaded. Flex with a torn inner liner is a dirt trap no brush will fix; the debris lives in the folds behind the tear. Duct board plenums that have gone soft and fibrous are shedding into the airstream, and running a brush through them makes that worse, not better. Same with a run that has been wet long enough to grow a film on the fiberglass. In those cases we tell you the section needs replacing and we do not take money to vacuum it first. We would rather lose the job than hand you a clean-looking vent and the same air.

What we bring is a truck-mounted vacuum, not a shop vac. The unit stays at the curb and pulls the whole system under negative pressure through a connection at the main trunk. Every supply and return register gets sealed off so the pull goes where we want it. Then the crew works run by run with rotary brushes and compressed-air whips sized to the duct, knocking loose what is stuck to the wall so the vacuum can carry it out. Trunks, branches, boots, the return drop, the blower compartment. We work on Carrier, Trane, Lennox, Goodman, Rheem and American Standard air handlers, and on the mixed-vintage systems common here where a newer condenser was hung on original sheet metal. If the real problem turns out to be a dirty evaporator coil or air bypassing a loose plenum connection, we tell you that instead of selling you a cleaning that will not change anything. Plenty of houses we look at do not need the ducts cleaned yet, and we say so and leave.

The calls that bring us out most are the ones this coast produces on its own. Gulf Coast central Florida has the longest cooling season in the continental US, which pushes residential HVAC to near year-round runtime, and nearly every cubic foot of conditioned air in these homes passes through duct hung in an unconditioned attic that reaches 120-140F in July. Mid-century Hillsborough homes were built with sheet metal trunks and, from the 1960s on, fiberglass duct board plenums that erode and shed fibers after two or three decades. From the late 1970s forward almost everything is R-4.2 to R-8 insulated flex, which sags between supports, collapses at bends, and tears at the inner liner. The constant is 70-90% relative humidity outdoors against 55F supply air, so you get condensation anywhere the vapor barrier is breached, and damp fiberglass in a hot attic grows microbial film. Pollen load is three-season — oak catkins February-April, pine, then bahia grass and ragweed into fall — with no hard winter freeze to clear the air, and on top of that fine Gulf-coast sand, construction dust from continuous regional building, and the occasional Saharan dust plume in midsummer. As for cost, the things that move it are the number of supply runs, whether the attic is tall enough to stand in or a belly-crawl over trusses, how many returns feed the system, and whether we find sections that need sealing at the connections once they are clean. A one-system three-bedroom with accessible runs is a different day than a two-system house with a 1970s trunk buried under blown-in. Keeping a clean filter in the return is what stretches the time until the next cleaning, and in a lot of Tampa houses that alone buys years.