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Leaky or Disconnected Air Ducts
in Greensboro, NC
A leaky duct system is like running your heat or AC with a window cracked open. The conditioned air you paid for escapes into spaces that do not need it. In Greensboro, where summers push into the mid-90s and heating bills spike in January and February, duct leaks hit your wallet hard. The rooms at the far end of the duct run are usually the ones that never get comfortable.
Quick Answer
Leaky ducts lose conditioned air into attics, crawl spaces, and wall cavities before it ever reaches your rooms. Studies have found that homes in North Carolina lose up to 30 percent of their heating and cooling through duct leaks. A technician seals the leaks with mastic or metal tape and can test the system to confirm the fix worked. If some rooms are always too hot or too cold, leaky ducts are the first thing worth checking. Call (743) 222-5018 to get it inspected.
Telltale Signs
Warning Signs to Watch For
- One or more rooms that stay too hot in summer or too cold in winter
- Energy bills noticeably higher than neighbors with similar homes
- HVAC system runs much longer than it used to
- Dusty conditions in attic or crawl space getting worse over time
- Musty or unconditioned air smell coming from certain vents
Root Causes
What Causes Leaky or Disconnected Air Ducts?
Failed Duct Tape on Joints
Original duct tape used on Greensboro homes built in the 1980s and 1990s was not the metal foil type. It was cloth-backed tape that dries out and falls off in attic temperatures that can reach 130 degrees in a Guilford County summer. Once that tape fails, joints open up and air pours out into the attic.
The Fix
Mastic Sealant Application
Mastic is a paste that gets brushed onto every joint and connection in the duct system. It stays flexible, bonds permanently, and does not dry out the way tape does. It is the industry standard fix for leaky joints.
Disconnected Flex Duct Sections
Flex duct sections in attics and crawl spaces can pull apart at connection points due to settling, pest damage, or improper installation. A fully disconnected section dumps all of its airflow directly into the attic or crawl space, so the room it was supposed to serve gets almost no air.
The Fix
Flex Duct Reconnection and Sealing
The disconnected section gets pulled back onto its fitting, secured with a metal clamp, and sealed with mastic. If the flex duct itself is torn or crushed, that section gets replaced with a properly sized new piece.
Aging Sheet Metal Duct Corrosion
Older homes in Greensboro neighborhoods like Latham Park or Sunset Hills may have original galvanized sheet metal ducts from the 1960s. In crawl spaces where moisture is present, those ducts rust through over decades. Small rust holes let air escape and can also pull in ground-level air and odors.
The Fix
Duct Section Replacement
Corroded sections of sheet metal duct get replaced with new galvanized or aluminum duct that is properly sealed and insulated. Spot replacement is often enough if the rest of the system is still in good condition.
Self-Diagnosis
Which Cause Applies to You?
Check the signs you're observing to narrow down the likely root cause before your inspection.
| What You're Seeing | Failed Duct Tape on Joints | Disconnected Flex Duct Sections | Aging Sheet Metal Duct Corrosion |
|---|---|---|---|
| Rooms at far end of system always uncomfortable | |||
| Energy bills higher than expected | |||
| System runs constantly without reaching set temperature | |||
| Visible rust stains or holes on duct exterior | |||
| Unconditioned air smell from specific vents |
Free Inspection
Get a Diagnosis in Greensboro
An on-site inspection is the only way to confirm which cause applies to your property. Free, no obligation.
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Serving Greensboro & surrounding areas
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