Whole-home duct cleaning
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Sanitizing & deodorizingWhole-system duct and dryer vent check with before-and-after photos - you see exactly what came out of your vents
That "$99 whole-house special" is a bait ad - the real number appears once they are in your hallway, or the "clean" is a shop-vac at the register. We photograph the inside of your ducts before and after instead.
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- Whole-home duct cleaning
- Dryer vent cleaning
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Before
AfterHow Much Does Duct Repair & Sealing Cost in St. Petersburg?
Duct repair and sealing in St. Petersburg typically costs $380 to $1,450 for most homes, with small seal-and-tape fixes at the low end and partial duct replacement at the high end. A whole-house sealing job with mastic on accessible attic runs commonly lands between $650 and $1,100. Every price is set per job by a written estimate, and estimates are free.
If you’ve noticed higher electric bills, rooms that never cool properly, or dust settling on furniture faster than it used to, the ducts are a reasonable place to start looking. In St. Petersburg’s humid subtropical climate, your HVAC system runs hard for most of the year, and ductwork sealed years ago has had plenty of time to dry out, crack, and pull apart at the joints. What follows is a straight look at what repair and sealing actually cost here in 2026, what moves the number up or down, and how to tell the difference between a real repair and a quick fix that fails by the next cooling season.
How Much Does Duct Repair & Sealing Cost in St. Petersburg?
Most duct repair and sealing work in St. Petersburg runs $380 to $1,450, depending on how much ductwork is accessible, how badly the joints have failed, and whether the damage is limited to sealing or extends to replacing flexible duct or repairing rigid trunk lines. A focused repair on a handful of failed joints is a few hundred dollars. A full-house sealing job with mastic and proper support straps on attic ductwork typically runs $650 to $1,100. The number that matters is the one on your written estimate after an inspection.
Duct Repair & Sealing Cost Breakdown (2026)
Here’s how the work usually breaks down by line item for the St. Petersburg market. These are typical ranges for residential homes, not quotes.
| Job | Typical cost range | What it covers |
|---|---|---|
| Sealing a few failed joints | $180 – $340 | Mastic or foil-backed tape on accessible joints, re-strapping a sagging run |
| Partial duct sealing (single zone or wing) | $380 – $650 | Sealing the accessible runs serving one side of the house |
| Whole-house sealing with mastic | $650 – $1,100 | All accessible joints, seams, boots, and plenum connections |
| Replacing a torn or disconnected flex run | $220 – $480 per run | New insulated flex duct, sealed and properly supported |
| Repairing rigid sheet-metal trunk or plenum | $450 – $900 | Sealing seams, repairing crushed sections, re-insulating |
| Rebuilding a collapsed or crushed section | $700 – $1,450 | Removing damaged duct, rebuilding the run, sealing the assembly |
| Rerouting a duct obstructed by renovation | $550 – $1,200 | New path for the run, new connections, sealing at both ends |
| Duct repair combined with a full clean | $900 – $1,900 | Cleaning, then repair and sealing on the cleaned system |
What pushes a job toward the top of those ranges: ductwork buried under blown insulation, rigid metal trunk lines instead of flex, long attic runs that require a ladder and careful footwork in tight space, and any job where the problem turns out to be structural rather than a matter of loose tape. What keeps it lower: accessible flex duct, clean attic access, and damage limited to a handful of joints. Homes in St. Petersburg built before the 1990s often still have original ductwork that has aged out of warranty and out of integrity, which tends to push toward the higher end. Newer construction tends to have flex duct that’s easier to seal and cheaper to repair.
What Affects Duct Repair & Sealing Pricing in St. Petersburg
Five factors drive the price of duct repair and sealing more than anything else in this market:
- Access. Ductwork in a St. Petersburg home usually runs through the attic or under the slab. Attic access is common but slow – hot attics, tight clearances, and insulation that has to be moved and put back. Slab ducts and ducts buried under blown insulation take longer to reach, and that labor shows up on the estimate.
- Duct material. Flex duct is cheaper to seal and repair than rigid sheet metal. Rigid trunk lines require careful work around seams, plenum connections, and joints that are often hidden inside a chase or a wall cavity. If a section of rigid trunk has partially collapsed, rebuilding it is a bigger job than sealing a flexible run.
- How much has already failed. One loose joint is a repair. Fifteen loose joints, a crushed return, and a disconnected run to a bedroom are a whole-system job. The fix isn’t per joint – it’s per job, because once the system is open, sealing everything accessible in one visit is more efficient than coming back for the rest later.
- Humidity and condensate. St. Petersburg’s air is humid for most of the year. That means duct insulation that has absorbed moisture and lost its R-value needs replacing, not just taping. Ducts that stay wet also grow mold, and sealant won’t hold to a wet surface. Any job that involves wet insulation costs more because the insulation has to come out and go back new.
- Whether the problem is really the ducts. A house that’s hard to cool is sometimes a duct problem and sometimes an equipment or insulation problem. A proper inspection separates those before any work starts, so you’re not paying to seal good ductwork around a failing air handler.
One thing that doesn’t change the price here: mild winters. St. Petersburg doesn’t have a freeze season, so duct failures aren’t tied to a thaw cycle the way they are in colder parts of the country. Instead, the calendar is dominated by long cooling seasons, which is why duct problems in this market tend to show up as condensate damage, worn connections, and sagging runs rather than the freeze-related failures you’d see elsewhere.
How Much Does Duct Sealing Cost Versus Full Duct Replacement in St. Petersburg?
Sealing is cheaper than replacement in almost every case where the ductwork is still structurally intact. Sealing a whole accessible system runs $650 to $1,100, while a full replacement of attic ductwork in St. Petersburg typically runs well into the thousands. Replacement makes sense when ductwork is crushed, collapsed, or so deteriorated that sealing won’t hold. Sealing makes sense when the runs are sound but the joints, seams, and boot connections have failed. An honest inspection tells you which one you’re facing. We won’t seal ductwork that should be replaced, and we’ll show you the pictures of why.
How to Save on Duct Repair & Sealing
The savings are rarely in the hourly rate. They’re in having the work done once, correctly, so you don’t pay twice.
- Get the whole accessible system sealed at once. Sealing one joint today and the next three next month costs more over time than sealing everything in a single visit. One visit, one seal, one warranty.
- Bundle repair with cleaning when it makes sense. If the ducts haven’t been cleaned, cleaning first then sealing on a clean system is more efficient than sealing dirty ductwork and opening it up again later. The Shield Air Duct Cleaning standard is to look at the whole system, not just the piece that failed.
- Ask for photos before and after. A written estimate plus before-and-after photos is your protection against paying for work that wasn’t done. Any honest company will provide both.
- Don’t tape over wet insulation. Sealant needs dry, clean surfaces. If the insulation is wet, replacing it is part of the fix – taping it and hoping is what gets you back here in six months.
- Get a free estimate in writing. The estimate is free, the price is per job, and the written number is the number. Call (855) 967-4983 for a free estimate before agreeing to anything.
When Should You Call for Duct Repair in St. Petersburg?
Call when the signs point to ductwork rather than equipment. In practice, that means higher-than-usual electric bills without a change in how you use the system; rooms that stay warm or cool inconsistently no matter what the thermostat says; dust settling on surfaces faster than normal; visible tape peeling or torn flexible duct in the attic; and a system that seems to be losing air before it ever reaches a register. If you’ve had a recent renovation, that’s also a moment to look – sawdust and debris get into open ductwork and construction dust clogs returns in a way regular cleaning doesn’t reach. Whatever brought you here, the diagnostic step is the same. An inspection, a written estimate, and photos you can see for yourself.
If you’re ready to schedule, the St. Petersburg service page covers what a typical visit includes. We use professional-grade equipment – Rotobrush and Nikro duct cleaning systems and Abatement Technologies containment when the job calls for it – and our technicians have up to 12 years of experience. We clean it. We repair it. We protect it.
FAQs – Duct Repair & Sealing Cost in St. Petersburg
How much does duct sealing cost in St. Petersburg?
Whole-house duct sealing with mastic in St. Petersburg typically costs $650 to $1,100. Sealing a few failed joints runs $180 to $340, and partial sealing on one zone runs $380 to $650. The estimate is free and the price is set per job by the written estimate – call (855) 967-4983 for an exact quote.
Is it cheaper to repair or replace ductwork in St. Petersburg?
Repair and sealing are cheaper than replacement in almost every case where the existing ductwork is still structurally sound. Sealing a whole system usually runs $650 to $1,100, while replacing attic ductwork typically runs well into the thousands. Replacement makes sense when ductwork is crushed or collapsed, not when it’s merely leaking at the joints. Call (855) 967-4983 and we’ll tell you honestly which one you’re facing.
How much does a single torn duct run cost to replace in St. Petersburg?
Replacing one torn or disconnected flexible duct run typically costs $220 to $480, including new insulated duct, sealing, and proper support. Jobs that require rerouting around a renovation or moving a run away from an obstruction run higher, $550 to $1,200. Call (855) 967-4983 for a free estimate on your specific job.
Can you come today if my ducts are leaking?
Same-day dispatch is often available when you call during dispatch hours, Sunday through Friday, 7am to 7pm. Call (855) 967-4983 – we answer 24/7, and fast dispatch from 7am to 7pm means most service calls are booked into the next opening. Estimates are free.
Why do duct problems cost more in St. Petersburg attics?
Attic conditions and long cooling seasons in St. Petersburg make ductwork harder to reach and more expensive to fix. Hot attics, insulation that has to be moved and replaced, and ducts buried under blown insulation all add labor. Duct insulation that has absorbed humidity also has to be replaced rather than sealed over, which pushes a repair toward the upper end of the $380 to $1,450 range. Call (855) 967-4983 for an exact quote on your home.
Duct repair and sealing is not a commodity service, and the shops that price it like one are usually the ones who taped it, billed it, and left. If you want a straight number and a written estimate, pick up the phone. Call (855) 967-4983 for a free estimate. We answer 24/7. Fast dispatch from 7am to 7pm, Sunday through Friday. Our technicians have up to 12 years of experience, we use Rotobrush and Nikro systems on every duct cleaning job, and we know Honeywell and Aprilaire systems well enough to understand what’s happening upstream of the ducts themselves. We clean it. We repair it. We protect it.
Pricing reflects the St. Petersburg market as of 2026. Shield Air Duct Cleaning offers free estimates – call (855) 967-4983.
Written by the team at Shield Air Duct Cleaning.
What Our Customers Say
"Did the dryer vent while they were here for a small add on price. The dryer now finishes a load in one cycle instead of two."
- Jamal Grant"Quoted per system rather than the bait and switch per vent pricing everybody else in town uses. The number I was told on the phone was the number on the invoice."
- Tiana Dawson"Ran a negative air machine on the whole system rather than the shop vac on a stick that the cheap outfit down the road uses. Showed me the before and after photos from inside the trunk line and it was genuinely disgusting."
- Priya Rao