Lafayette’s Ductwork Challenge
Lafayette’s housing stock spans nearly a century of construction methods, and every era brought its own approach to ductwork. The older Craftsman homes along Johnston Street and in the Freetown neighborhood often have modified or patched duct systems that have been altered by multiple contractors over the decades. Mid-century ranch homes in the Bendel Gardens and Greenbriar areas typically have ducts running through slab trenches or tight crawlspaces. Newer construction in the Kaliste Saloom corridor and south Lafayette subdivisions usually features flex duct in the attic, which brings its own set of problems in our climate.
Each of these setups demands a different approach to duct repair, sealing, or replacement. The same fix that works for a slab-duct ranch home on Eraste Landry won’t apply to a raised Acadian cottage near Girard Park. That’s why we start every ductwork project with a full assessment of what you have, what shape it’s in, and what your system actually needs to deliver air efficiently.
The Hidden Cost of Leaking Ducts
You might not think much about your ductwork because you can’t see it. It’s buried in attics, walls, and crawlspaces. But those hidden ducts carry every cubic foot of conditioned air your HVAC system produces, and when they leak, the waste is significant.
A typical duct system in Lafayette loses 20 to 30 percent of its conditioned air through gaps at joints, disconnected runs, and deteriorated flex duct connections. For a homeowner running their AC from March through November (which is most of us), that translates to hundreds of dollars per year in wasted electricity. Your system runs longer cycles, your compressor works harder, and your rooms still don’t cool evenly.
Duct Leakage Testing
We use calibrated duct leakage testing equipment to measure exactly how much air your system loses before it reaches your registers. The test pressurizes your duct system and measures airflow loss at a standardized pressure. This gives us a precise number, not a guess, and lets us prioritize which connections need sealing first.
After repairs, we retest to verify the improvement. Most homeowners in Lafayette see a measurable drop in energy use within the first billing cycle after duct sealing.
Flex Duct vs. Metal: What Works in South Louisiana
Flexible duct is cheaper to install and easier to route around obstacles, which is why builders favor it. But flex duct has real drawbacks in Louisiana attics. It sags over time, creating low spots where air pools instead of flowing. Connections at boots and plenums loosen, and the thin outer jacket tears if anyone steps on it or pushes it aside to access wiring or plumbing.
Metal duct, fabricated in our Abbeville sheet metal shop, lasts decades and maintains its shape regardless of temperature. It handles airflow more efficiently because the smooth interior creates less friction than the ribbed interior of flex duct. For main trunk lines and attic runs where performance matters most, metal duct is the better long-term investment.
We’re not rigid about it, though. A well-installed flex duct branch run with proper support and sealed connections can perform fine. The key is matching the material to the application and installing it correctly.
Attic Duct Insulation in Lafayette
Lafayette attics routinely hit 140 to 150 degrees in summer. If your ductwork runs through that space with R-4 insulation (or none at all), the air inside the ducts absorbs heat before it reaches your rooms. You end up with 65-degree air at the unit and 78-degree air at the register. R-8 insulation is the current Louisiana minimum for attic duct runs, and R-10 or higher pays for itself in energy savings within a few years.
We wrap metal ducts with foil-faced fiberglass insulation and seal every seam. For existing flex duct, we verify the insulation R-value stamped on the jacket and replace any runs where the insulation has compressed, torn, or gotten wet.
Get a Duct Assessment
If rooms in your Lafayette home don’t cool evenly, if your energy bills seem too high for your square footage, or if you see dust blowing from your vents, your ductwork may be the culprit. Call F & R Air Conditioning at (337) 893-5646 for a duct evaluation and honest recommendation.