Ductwork replacement in Birmingham, AL
Sometimes the ducts are the reason a good system feels bad. When the layout is undersized, leaky or worn out throughout, we design and install a new duct system from scratch.
Ductwork replacement means designing a new duct system with an ACCA Manual D calculation, sizing the supply runs and returns to the airflow your equipment needs, and installing it with sealed joints and proper insulation. Zeltman Heating & Air removes the old ducts, installs and tests the new ones, and gives you the full price before any work is scheduled.
When new ductwork beats another round of repairs
A duct system is designed once and rarely revisited, even as homes gain additions, bigger equipment and finished bonus rooms. In many older Birmingham homes, the ducts were sized for a smaller system long ago. Others were added later by squeezing runs wherever they fit. No amount of sealing fixes ducts that are simply too small for the job.
We start with a Manual J load calculation to find how much air each room needs. Then a Manual D design sizes every supply run, trunk and return for that airflow. Return air is where many older systems fall short. A single small hallway return makes the blower strain and raises static pressure. It also starves bedrooms of air when the doors are closed.
Insulation matters as much as size in this climate. Attic air in August can pass 130 degrees. We use R-8 insulated flex or wrap on attic runs and R-6 or better in crawlspaces. Every joint is sealed with mastic, and every flex run is pulled tight and supported so it keeps its full diameter.
Replacing ducts along with the equipment is often the smartest timing. The new system can be sized to the new ducts, and the attic is opened only once. When the equipment is young, replacing the ducts alone still makes sense if they are the reason it cannot keep up. If only a few runs are failing, ductwork repair may be all you need, and we will tell you so.
What goes into a ductwork replacement design
- Manual J room-by-room heating and cooling loads
- Manual D sizing for trunks, branches and returns
- Return air capacity and a return path for every closed room
- Static pressure targets matched to your blower
- Duct routing that avoids long runs, kinks and sharp turns
- R-8 insulation in the attic and R-6 or better in crawlspaces
- Mastic-sealed joints and proper flex support spacing
- Register and grille sizing for air throw and quiet operation
What ductwork replacement costs in Birmingham
$4,860 to $11,470
A single-story ranch with an open attic and a straightforward layout sits near the low end. Two-story homes, crawlspace work, added returns, zoning and tight access push it higher. Removing and hauling away the old ducts is included. You get the full price before anything is scheduled.
Ask for a price (659) 777-4129What moves the number
- Size and layout of the home
- More rooms mean more runs, and two-story homes may need separate trunks or a second system's ducts.
- Attic or crawlspace access
- A roomy attic is quicker to work in than a shallow crawlspace or a low-pitch roof.
- Added returns
- Many older homes need new return paths cut in, which adds framing, drywall and grille work.
- Duct materials
- Sheet metal trunks with insulated flex branches cost more than all-flex layouts but last longer and move air more efficiently.
- Pairing with new equipment
- Replacing ducts during an equipment swap shares the labor and lets everything be sized together.
How a ductwork replacement goes
We measure the house and the old ducts
We run the load calculation, map the existing ducts and take static pressure and airflow readings.
You get a design and a price
We explain the new layout, where the returns go and what changes, with the full installed price.
Old ducts come out
We remove and haul away the old ductwork and protect floors and furniture below the attic hatch.
New ducts go in
Trunks, branches and returns are installed to the design, sealed with mastic and insulated to the right R-value.
We test and balance
We measure airflow at each register and static pressure at the blower, then set dampers so each room gets its share.
When ductwork replacement makes sense
Original ducts failing everywhere
When joints, insulation and flex are worn throughout, sealing piece by piece costs nearly as much as new ducts.
Static pressure is too high
Undersized ducts and returns force the blower to strain, shortening motor life and cutting airflow.
An addition was never tied in properly
Rooms added on with a long tap off the nearest duct rarely get enough air, especially when the door is closed.
A new system is going in
Pairing new equipment with undersized ducts throws away much of the efficiency you paid for.
Insulation is thin or crumbling
Old ducts with little insulation in a hot attic lose cooling before it ever reaches the rooms.
Mold, pests or water damage
Ducts contaminated or crushed by water or rodents are often better replaced than cleaned and patched.
Ductwork replacement across Birmingham
Mountain Brook and Homewood homes often have additions the original ducts were never designed to reach. A redesign there usually adds trunks and returns rather than copying the old layout. In Bessemer, Center Point and Huffman, many ranch homes still run their original ducts. Those old ducts are often why a newer outdoor unit struggles.
In Hoover and Chelsea two-story homes, new attic ducts for the upstairs system are a common fix for hot bedrooms. Sometimes we pair them with zoning. We plan around the season when we can, since attic work is far easier in spring and fall than in August. Our base on 15th Avenue North keeps the east side close. We install across Jefferson, Shelby and St. Clair counties.
Areas we cover most often
We repair and replace equipment from these manufacturers, plus most other makes.
Questions about ductwork replacement in Birmingham
A single-story home usually takes one to two days. Two-story homes, crawlspace systems and jobs that add returns or zoning can take two to three. We give you the schedule with the price and keep the system running overnight whenever we can.
Often, yes. Whistling registers and a roaring return grille usually mean the ducts or returns are too small for the airflow. A Manual D design sizes runs and grilles so air moves at a quieter speed, and added return capacity eases the strain on the blower.
Manual D is the ACCA method for sizing ducts. It uses the airflow each room needs, the blower's capacity and the length and fittings of every run to pick the right size. Without it, new ducts often repeat the old mistakes in fresh materials.
For attic runs we install R-8 insulated duct, and R-6 or better in crawlspaces. Attics here can pass 130 degrees in summer, so thinner insulation lets cool air warm up before it reaches the rooms and can let ducts sweat in humid weather.
It usually does when the old ducts were leaky, poorly insulated or undersized, because more of the cooling and heating reaches the rooms and the system runs fewer hours. How much it changes depends on how bad the old ducts were, which is why we measure before and after.
Most of the work happens in the attic or crawlspace. We cover floors and furniture under hatches, cut new return openings carefully and haul away the old ducts. Some insulation dust near the access points is unavoidable, and we clean up before we leave each day.
Related services and reading
- Ductwork Repair and SealingDisconnected runs, crushed flex, sweating ducts and leaky joints in attics and crawlspaces.
- Complete HVAC System ReplacementOutdoor unit, indoor unit, coil and controls replaced together as one matched system.
- HVAC ZoningDampers and zone controls so upstairs and downstairs stop fighting over one thermostat.
- Hot and Cold Room FixesAirflow testing and balancing for rooms that never match the thermostat.
- Sweating, leaking, crushed: duct trouble in older homesDuctwork guide
- Why a bigger AC is not a better ACBuying guide
Need ductwork replacement in Birmingham?
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