Most of us in Greater New Orleans grew up with houses that have been standing for decades. The roofs, the plaster, the old-school windows – they all have character, but they also come with systems that were built to handle a different climate and a different set of building codes. Your HVAC system is no exception. When the ducts that carry conditioned air are cracked, pulled apart, or simply not sealed properly, the whole house feels the impact.
In a city where summer humidity can push indoor temperatures above 90 °F and the electric bill from Entergy climbs fast, a few leaky spots in the ductwork can add up to a noticeable comfort tax. The good news is that the problem is fixable, and the fix doesn’t require a full system replacement. Below we break down why older homes in Kenner, Metairie and the surrounding area tend to develop leaky ducts, how you can spot the issue, and what a professional sealing job looks like.
Why Ducts Go Leaky in Older New Orleans Homes
When a house was built in the 1950s or 1960s, the ductwork was often installed with sheet metal that was manually folded and fastened with simple clips. Over time, the metal expands and contracts with temperature swings, and the fasteners loosen. In a humid climate like ours, moisture can cause corrosion that eats through thin metal, creating holes that are hard to see without a flashlight.
Another common cause is the way ducts were routed through unfinished attics or crawl spaces. Those areas were not always insulated, and the ducts were left exposed to the elements. As insulation settles or is removed during remodels, gaps appear around the duct seams. The result is a network of tiny leaks that let conditioned air escape into unconditioned spaces.
Renovations can also introduce new leaks. When a wall is opened for electrical work or a bathroom remodel, the contractor may cut through a duct and not reseal it properly. In older homes, the original duct layout may not match the current floor plan, leading to sections that are under-used, over-stressed, or simply forgotten.
How Leaky Ductwork Affects Comfort and Energy Bills
Every cubic foot of air that leaks out before reaching the room is a wasted load of energy. In a hot, humid summer, the air conditioner works harder to replace that lost cool air, which pushes the electric meter higher. In the winter, heated air escapes and the furnace has to fire longer. The net effect is an energy loss that can range from 10 % to 30 % of your total HVAC usage, depending on how many leaks exist.
Uneven temperatures are another symptom. You may notice that the bedroom stays cool while the living room feels warm, even though the thermostat reads the same setting. That happens because the supply air for each room travels a different distance through the duct network, and any leaks along the longer route will reduce the amount of air that actually arrives.
Beyond comfort and cost, leaky ducts can affect indoor air quality. Unconditioned air that enters the duct system can bring in dust, pollen, and even mold spores from the attic or crawl space. Over time, that can lead to a musty smell or trigger allergies, especially for households that rely on air filtration.
Spotting Leaky Ductwork Yourself
The first step is a visual inspection. Turn off the HVAC system and go to the attic or any accessible duct runs. Look for obvious holes, rusted sections, or loose connections. If you see metal that is flaking or a seam that is not tightly clamped, that’s a sign the duct is compromised.
Next, feel for airflow. With the system running, place your hand near a supply vent and compare the strength of the breeze to a vent on the opposite side of the house. A noticeably weaker flow can indicate a leak somewhere in the line. You can also hold a piece of tissue or a thin strip of paper near the vent; if it flutters less than expected, that’s another clue.
Another practical test is the “smoke pencil” method. Light a smoke pencil (or a stick of incense) and move it slowly along the duct seams. If the smoke is drawn into a seam, air is being pulled out of the duct at that point, confirming a leak.
Finally, keep an eye on your utility bills. A sudden jump in your monthly electricity cost, especially during a season when you haven’t changed thermostat settings, often points to hidden losses like leaky ductwork.
What Professional Duct Sealing Involves
When you call Tegridy Air, the first thing our technician does is a diagnostic service call, which runs $90-$150. During that visit we locate all the leaks, document their size, and explain the repair plan. The inspection includes a pressure test that measures how much air is escaping, so we have a baseline to compare after the work is done.
The actual sealing process starts with cleaning the ducts. Dust and debris are removed with a vacuum system to ensure the sealant adheres properly. Then we apply a high-quality, UL-listed duct sealant—usually a combination of foil-backed tape and a mastic coating. The tape is wrapped over seams and joints, while the mastic is brushed on larger gaps and holes.
In areas where the metal is severely corroded, we may replace a short section of duct rather than try to patch it. That decision is based on the condition of the material and the cost-benefit analysis we discuss with you. All work follows the local building codes for New Orleans, which require a minimum of 90 % airtightness for residential ducts.
After sealing, we repeat the pressure test to confirm the improvement. A typical job in a 1,800-square-foot home in Kenner or Metairie takes a full day, but larger homes or houses with multiple attic levels may need two days. Labor is billed at around $200 per hour, and any additional parts—like new metal collars or replacement sections—are priced according to the ranges listed in our service guide.
Cost Expectations and Return on Investment
Because the price of duct sealing can vary with the size of the home and the extent of the leaks, it’s hard to give a single number. Most homeowners in the Greater New Orleans area see a total job cost that falls between $800 and $2,000, including labor, sealant, and any necessary replacement sections. The service call and diagnostic fee is included in that range.
When you compare that cost to the potential savings on your electric bill, the math often works out quickly. If leaky ducts are causing a 20 % increase in energy use, a typical household that spends $150 a month on cooling could save $30 each month after the fix. In a single cooling season, that adds up to $360, which already covers half of the lower-end repair cost.
There are also indirect savings. With a sealed system, the air conditioner doesn’t have to run as long, which reduces wear on the compressor and fan motor. If a fan/blower motor eventually needs replacement, the price range is $450-$1,200, and a well-sealed system can extend the motor’s life by several years.
Finally, a properly sealed duct system improves the performance of any additional upgrades you might add later—such as a smart thermostat or an air purifier—because those devices rely on consistent airflow to work efficiently.
Maintaining Sealed Ducts and Next Steps
Once the ducts are sealed, regular maintenance is the best way to keep them that way. Schedule a seasonal tune-up with Tegridy Air, which includes a visual check of the ductwork, a filter change, and a quick pressure test. The service call for a tune-up is the same $90-$150 range, and the hourly labor rate remains around $200.
Keep the attic and crawl spaces as dry as possible. Use a dehumidifier if you notice excess moisture, and make sure any roof leaks are repaired promptly. Moisture is the enemy of metal ducts, and it can cause new leaks to form even after a professional seal.
If you decide to upgrade your system—say, replace an old central AC unit—the new installer should inspect the existing ducts before hooking up the new equipment. A new unit paired with sealed ducts delivers the most efficient operation. For reference, a new central AC system installed in the New Orleans metro typically costs $5,500-$11,000, depending on size and SEER rating.
In addition to sealing, consider adding an air purification system if indoor air quality is a concern. A whole-home filter can be installed in the return plenum, and it works best when the duct network is airtight, because the filtered air isn’t diluted by leaks.
Final Thoughts
Leaky ductwork is a quiet source of higher bills and uneven comfort in older New Orleans homes. The problem is easy to miss, but the signs are there—cold spots, higher electricity usage, and a drafty feel near vents. By having a qualified technician inspect, seal, and test the system, you can restore the balance and stop paying the hidden comfort tax.
Tegridy Air has been serving Kenner, Metairie, and the surrounding South Louisiana community for years. We treat every job like we’re working on our own house, which means honest assessments, clear explanations, and no unnecessary upsells. If you suspect your ducts are leaking, give us a call or request a free quote online.
Call us today at 504-414-8655 or visit tegridyair.com to schedule a diagnostic, tune-up, or free quote. Let’s get your home running the way it should.
Need honest HVAC help in Kenner, Metairie, or anywhere across the Greater New Orleans area? Call Tegridy Air at 504-414-8655 or request a free quote online – we’ll get you comfortable fast.
Related Reading
- Ducted vs Ductless HVAC System: Which Is Right For Your Home?
- Repair or Replace Your AC? Honest Cost Breakdown for New Orleans Homeowners
- Hurricane Season HVAC Prep: Protect Your AC Before the Storm Hits
Frequently Asked Questions
How can I tell if my ducts are leaking without opening the attic?
Look for uneven room temperatures, higher than usual energy bills, and weak airflow at vents. You can also use a smoke pencil near accessible duct seams; if the smoke is drawn into a seam, air is escaping.
Will sealing my ducts reduce the size of my air conditioner or furnace needed?
Sealing improves the efficiency of the existing system but does not change the capacity needed for heating or cooling. However, a sealed system may allow you to run the equipment at a lower fan speed, which can extend its life.
How often should I have my ducts inspected?
A good rule of thumb is to have a professional inspection during each seasonal tune-up—once in the spring before cooling season and once in the fall before heating season.
Is duct sealing covered by any warranties or guarantees?
Tegridy Air offers a workmanship guarantee on all duct sealing jobs. The guarantee covers any leaks that develop from the same work within a specified period, typically one year.