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What Are the Signs of Leaky Ductwork?
Three signs show up most often in the homes we inspect: uneven temperatures between rooms (some noticeably warmer or colder than others), higher energy bills without any change in how you use the system, and dust accumulating faster than usual near supply vents. Any one of these on its own can have other causes, but two or more together point strongly toward duct leaks.
Uneven Room Temperatures
When a duct run has a leak or a disconnected joint, conditioned air escapes into an attic, crawlspace, or wall cavity before it ever reaches the room it was meant for. Rooms at the end of a long duct run — often back bedrooms or additions — are usually the first to feel it.
Rising Bills Without More Use
A leaking duct system forces your HVAC to run longer to compensate for lost conditioned air, which shows up as a higher bill even though your habits haven't changed. This is one of the quieter signs, since nothing feels obviously wrong day to day — just a bill that keeps creeping up.
Dusty Rooms Near Supply Vents
A leak on the return side of the system can pull unfiltered air from an attic or crawlspace into the ductwork, which then gets distributed throughout the home — showing up as noticeably dustier rooms, especially right around supply vents.
What to Do Next
None of these signs alone confirms duct leaks — a failing capacitor can also raise bills, for instance. A camera-based duct inspection is the only way to confirm the leak's location and severity before deciding between sealing and replacement.
Noticing one or more of these signs in your home? Schedule a duct inspection.
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