Of all the reasons to clean ductwork, this is the one with no counterargument. A renovation puts construction debris into the HVAC system, and it stays there.
What Happens During a Renovation
Drywall is cut, sanded and finished. Flooring is removed. Paint is sprayed. And unless the HVAC system has been fully isolated — which it almost never is, because the unit needs conditioning — the return draws all of it in.
Fine gypsum dust passes straight through a builder’s filter, if one is fitted at all. It settles in the return plenum, coats the evaporator coil, and deposits along the supply trunk. When the system next runs at full load, the supply side redistributes it into the finished unit.
New Construction Is Worse
Ductwork goes in early in the build sequence and sits open for weeks while every other trade works around it. We have opened supply trunks in buildings under five years old and removed drywall offcuts, insulation batting fragments, sawdust and food packaging.
This is a construction defect, not a maintenance item. Which means the question is when you find it, not whether it is there.
The Warranty Window
Identify construction debris inside the warranty period and the builder remediates it at their cost. Identify it at year eight, during a value-add renovation, and it becomes your capex line.
On a 428-unit Tampa community we cleaned across 24 buildings, construction debris was still inside the ductwork alongside dust contamination from a subsequent renovation. Read the case study.
What We Do
Full negative-pressure containment under HEPA filtration. Supply trunks and branch runs brushed and vacuumed. Return plenum cleaned. Coil cleaned — because that is where the gypsum dust went. Registers removed, cleaned and refitted. Access panels cut where required and closed with sealed rigid panels to NADCA ACR requirements.
Photographed before and after, every unit, with a deficiency log naming what came out and where.
Commercial air duct cleaning | Dryer vent inspection
Frequently Asked Questions
Is this really necessary after a renovation?
This is the one duct cleaning trigger nobody disputes. Drywall dust is fine, abrasive and gets everywhere, and a renovation with the HVAC system running draws it directly into the return. It then sits in the supply trunk and blows into the unit for years. The EPA lists substantial deposits of dust and debris as a legitimate reason to clean.
What about new construction?
Same problem, worse. Ducts are installed early and open for weeks. We routinely find drywall offcuts, insulation fragments, fast food packaging and sawdust in supply trunks of buildings less than five years old.
Who pays — owner or builder?
That depends on your warranty window. Construction debris in ductwork is a construction defect, not a maintenance item. Find it within the warranty period and the builder remediates it. Find it at year eight and you do. Inspect early.
Does the contractor not clean up?
The contractor cleans the unit. Almost nobody cleans the ductwork, because it requires different equipment and nobody specified it. It is one of the most reliable findings in our entire practice.