Ductwork Repair & Sealing | Tampa Bay

The duct system is the part of an air conditioning installation that gets the least attention and causes the most performance complaints. Ducts that leak, that are crushed, that are undersized, or that run an unnecessarily long route through an attic all waste capacity before the air reaches the room it was meant for.

The attic itself is the problem. In summer an unconditioned attic here can exceed 130 degrees, so a duct leaking into it is not just losing cool air, it is losing it to the hottest environment in the building. Sealing those leaks produces a measurable improvement in comfort and running cost.

Where ducts leak

The leaks that matter most are at the joints, not in the middle of a run. Where a flex duct connects to a boot, a plenum or a trunk, the connection relies on tape, mastic or a collar, and those fail over years of thermal cycling in an attic. Disconnected runs are also common, particularly where a duct has been disturbed by other trades working in the attic. A single disconnected supply duct can dump a large share of a system capacity into the attic.

Return air and static pressure

A system needs to draw air back as easily as it supplies it. Undersized returns are a frequent finding, particularly on systems that were installed before the house was enlarged or before a filter was upgraded to a denser type. Restricted return air raises static pressure, reduces total airflow and makes the system work harder for less cooling. Addressing return capacity is often more effective than any equipment change.

Repair, seal or redesign

Small leaks and failed joints are sealing work. Crushed or collapsed flex runs need replacing. A duct system that was laid out poorly in the first place, with long convoluted runs and excessive bends, may need redesigning rather than patching, because every bend and every extra foot of run adds resistance. Which category you are in is established by measuring static pressure and inspecting the actual layout.

When to call

Some rooms are always warmer or cooler than others
The house never reaches the thermostat setpoint
You can see or hear air escaping in the attic
A duct has come apart or been crushed
You are replacing the AC and want the ducts assessed
Your energy bill is high relative to the cooling achieved

How the work is handled

Inspect the duct layout, insulation and connection condition
Measure static pressure and airflow to identify restriction
Locate leaks and disconnections, including in concealed runs
Seal joints and repair or replace damaged sections
Re-measure airflow and confirm the improvement

What affects the cost

We do not quote a number before seeing the property, because the same job on two similar houses can need different work. These are the factors that move the scope:

Extent of leakage and the number of joints to be sealed
Whether damaged runs must be replaced rather than repaired
Access throughout the attic and any concealed sections
Whether return air capacity has to be increased
Duct insulation condition and whether it needs renewing
Whether the system needs rebalancing after the work

Frequently asked questions

How do I know if my ducts are leaking?

Rooms that never reach the setpoint, a system that runs constantly, and high bills relative to the cooling achieved are the usual signs. A static pressure measurement and an attic inspection confirm it and show where the losses are.

What is static pressure and why does it matter?

It is the resistance the blower works against. High static pressure means the system is moving less air than it should, which reduces capacity and can freeze the coil. Restricted return air is a common cause, and it is frequently more significant than any equipment issue.

Should I seal ducts or replace them?

Sealing addresses leaks at joints and connections. Replacement is needed for crushed, collapsed or badly degraded runs. A poorly designed layout may need redesign rather than either, because long runs and excess bends add resistance that patching cannot remove.

Do ducts in Florida attics need insulation?

Yes, and it matters more here than in a milder climate. An attic can exceed 130 degrees in summer, so an uninsulated or under-insulated duct loses a large share of its cooling capacity before the air reaches the room.

Related services

AC & Heating Service across Tampa Bay and Lakeland

Ducts running through attics that exceed 130 degrees in summer make sealing and insulation more consequential here than in markets where ducts run in conditioned space. We work throughout Tampa, Brandon, Riverview, Valrico, Plant City, Lutz, Land O' Lakes, Wesley Chapel, Odessa, Zephyrhills, Lakeland.

What we see most often in this region

Attic duct runs losing capacity to extreme summer attic temperatures
Joints and collars failing over years of thermal cycling
Undersized return air restricting total system airflow
Runs disconnected or crushed by other trades working in the attic