What Broward Attics Are Hiding
Three duct generations live above local ceilings: rigid ductboard from the 1970s-80s (fiberglass board that delaminates and leaks at every aged joint), older flex duct with crumbling outer jackets and compressed insulation, and modern flex or metal in decent shape. Add Broward attic heat, the occasional roof leak, and decades of cable installers crawling through, and the duct system is often the oldest unrenovated "appliance" in the house.
The Symptoms That Send Us Up There
Rooms that never cool while others freeze; bills that climbed while the AC tested fine; ducts sweating and dripping (condensation on under-insulated runs reads as "mystery roof leak"); musty smells when the blower starts; visible crushed or disconnected runs; and the big one — a healthy new AC that somehow cannot cool the house. Equipment gets replaced on schedule; the ducts it breathes through rarely do.
What Repair Can Honestly Fix
Sealing accessible joints and plenum connections (mastic, not the misnamed duct tape), re-insulating exposed runs, re-hanging sagging flex, replacing individual damaged sections, and balancing airflow between rooms. On a fundamentally sound system, this is real money well spent — leakage into a 120-degree attic is conditioned air you bought and never received.
When Replacement Is The Honest Call
Aged ductboard delaminating at every seam cannot be meaningfully sealed — there is no sound substrate to seal to. Flex with crumbled jackets and packed-down insulation sweats and leaks by design at that age. Undersized trunk systems choke modern equipment no matter how tight the joints are. And mold-colonized duct interiors are a replacement conversation, not a spray-and-pray one. Patching a system like that is buying the same repair annually.
Cost Factors For Each Path
Repair: accessibility, linear feet of sealing and insulation, and how many sections need replacing. Replacement: home size and run count, attic accessibility, design work (a proper replacement includes sizing the new system to the equipment — static pressure and airflow verified, not guessed), materials, and permit. The design step is the difference between new ducts and a new duct problem; a replacement quote without airflow math is decoration.
Pairing Ducts With Equipment Decisions
The best time to fix ducts is at AC replacement — one mobilization, one design pass, and the new equipment's warranty-and-performance story starts with airflow it can actually breathe through. If an AC replacement quote ignores visibly bad ducts, or a duct quote appears without any airflow measurement behind it, those are both half-quotes — the free second opinion page reads them whole.
Repair Vs Replace, By Duct Condition
The material and era usually answer first.
| Condition | Honest path | Why |
|---|---|---|
| Sound ducts, leaky joints | Repair: seal + insulate | Good substrate; high return on sealing |
| Crushed or disconnected runs | Repair: section replacement | Localized damage, sound system |
| Pre-1990 ductboard, delaminating | Replace | No sound substrate left to seal |
| Aged flex, crumbling jacket, sweating | Replace | Insulation failure is systemic |
| Undersized for the equipment | Replace (redesign) | Geometry, not joints, is the problem |
| Interior mold colonization | Replace + fix moisture cause | Cleaning rarely reaches it credibly |
Before Signing Any Duct Quote
- Ask what the duct material and approximate era is — it decides the path.
- Get static pressure / airflow readings into the quote, not adjectives.
- Sweating ducts? Confirm insulation spec, not just leak sealing.
- Replacing the AC soon? Price ducts in the same project.
- Mold language in a quote? Second opinion before remediation-priced work.
Authoritative Sources
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Schedule ServiceFAQs
How do I know if my ducts are leaking?
Uneven rooms, rising bills with a healthy AC, dusty rooms, musty blower-start smells, and visible attic evidence. A proper evaluation measures static pressure and inspects the runs — leakage gets quantified, not vibed.
Why are my ducts sweating?
Warm humid attic air condensing on cool, under-insulated duct surfaces — a Broward classic that mimics roof leaks. The fix is insulation and sometimes airflow correction; on aged flex with failed jackets, sweating is the retirement notice.
Is duct sealing worth it?
On sound ducts, very — attic leakage is conditioned air thrown away, and mastic sealing of accessible joints returns its cost in comfort and bills. On delaminating ductboard, sealing is a subscription, not a fix.
Can ducts be cleaned instead of replaced?
Cleaning addresses dust and debris in sound ducts; it does not cure leaks, failed insulation, undersizing, or colonized interiors. Our duct-cleaning guides cover when cleaning is honest — but it is not a structural remedy.
Does duct replacement need a permit?
New duct systems are permitted mechanical work in Broward municipalities, inspected like any changeout. The permit and the airflow design in the quote are both marks of a company planning to do it properly.
Should ducts and AC be replaced together?
When both are near end of life, yes — one project, one design pass, and the new equipment performs to its rating from day one. New equipment breathing through failed ducts is how five-figure installs underwhelm.
