Whole-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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AfterNikro Duct Sealing in Los Angeles: What to Know First
Nikro duct sealing in Los Angeles typically costs $450 to $1,600 depending on how much of your duct run needs treatment, and most jobs are completed in a single visit. We seal the leaks where the duct connects to boots, plenums, and joints using mastic and UL-rated tape, not hardware-store patch jobs. If you own a Nikro system and your utility bills have crept up or certain rooms never seem to hold temperature, the ductwork is usually the culprit, not the machine.
This page is for Los Angeles homeowners who know what a Nikro is and want the rest of the system working as designed. We’re an independent Nikro service provider, not a factory-authorized dealer, and we’ve been sealing ducts across Los Angeles since 2004. Call (361) 326-5060 and you’ll get a live person, a straight answer, and a written price before any work starts.
How Nikro Products Fail – and How We Fix Them
- Nikro negative-air machines running hot in summer. Nikro units like the NS series and the larger SP models pull serious air when paired with HEPA filtration. When the return-side ductwork leaks, the machine works harder to hit negative pressure, and in Los Angeles summers that means a unit that runs loud and trips its thermal overload. We find the leaks, seal them, and the unit settles back into its normal operating range.
- OEM gaskets at the machine-to-duct connection drying out. Nikro equipment ships with a foam gasket where the flex duct clamps to the machine housing. After five to seven years of Los Angeles heat cycles, that gasket shrinks and cracks, letting unfiltered air bypass the machine entirely. We replace it with a closed-cell gasket that holds up better than the original and costs less than you’d expect.
- Flex duct delamination on Nikro outfeed runs. The inner liner of older flex duct separates from the insulation jacket, especially where the duct runs through hot attics in the San Fernando Valley or the Eastside. You get airflow loss and sometimes a musty smell from insulation fibers entering the airstream. We cut out the failed section and seal the new connection with mastic, not just a zip tie.
- Nikro machine vibration loosening clamp connections over time. Some Nikro models use heavy-gauge steel housings that vibrate enough to walk a loose clamp right off the duct collar. It’s common on units installed in garage closets or utility rooms where the machine sits on a hard surface. We re-seat the duct, install a draw-band clamp with a rubber gasket, and test the seal under load.
- Boots and registers pulling away from the subfloor. This isn’t a Nikro-specific failure, but it’s what we find most often on Nikro installs in older Los Angeles homes: the register boot has separated from the wood or drywall around it, so conditioned air leaks into the crawlspace or wall cavity. We reseat the boot, seal the gap, and re-attach the grille so the air actually enters the room.
Our Nikro Duct Sealing Process
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You call, a live person answers. No voicemail loops. We schedule a window and the technician arrives inside it, uniformed and background-checked.
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We inspect the full duct run, not just the obvious spots. On a Nikro job that means checking the machine connections, any filter housings, the plenum, and every accessible boot and register.
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We show you what we found. Before we touch anything, you’ll see photos or get a walkthrough of the actual leaks. If we find a failed section of flex duct, you’ll see it before we cut it out.
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You get a written price. One number, before work starts. It covers the specific leaks we identified. It does not move at the door, and there is no per-vent add-on at the end.
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We seal by the book. Mastic on metal-to-metal joints, UL-rated foil tape where appropriate, and proper clamps on flex connections. We use OEM-compatible materials so your Nikro setup stays serviceable by any qualified tech later.
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We test and we clean up. We run the system to confirm the leaks are closed, then leave the site cleaner than we found it. Every job is covered in writing by our 365-Day Done Right Promise.
What Nikro Duct Sealing Costs in Los Angeles
Here’s what we charge based on what’s actually wrong, not a per-vent coupon. These are honest whole-system ranges for Los Angeles homes.
- Machine connection reseal: $145 to $225. New gasket, clamp, and mastic where the duct meets the Nikro housing.
- Boot and register sealing (up to 4 locations): $250 to $400. We reseat the boot, seal the gap to the subfloor or drywall, and re-attach the grille.
- Mid-run leak sealing (multiple joints): $350 to $550. We locate and seal leaks at each joint along the accessible duct run.
- Flex duct section replacement and sealing: $500 to $900. We cut out the failed section, install a new section, and seal both connections with mastic and clamps.
- Full accessible duct sealing package: $900 to $1,600. Every reachable joint, boot, and connection sealed, including the machine side. This is the fix that actually solves recurring temperature differences between rooms.
What moves the price: how many leaks, how much duct is accessible, and whether any flex sections need replacing rather than just sealing. Call (361) 326-5060 for a free estimate, and we’ll give you a written number before any work starts.
Why Los Angeles Homeowners Call Hollis Air Duct Cleaning for Nikro Work
We’ve been doing this since 2004, and we’ve seen enough Nikro units in Los Angeles homes to know exactly where they leak and why. Roy Castellanos grew up in Boyle Heights and cut his teeth in the mechanical trades through the sheet metal and air conditioning program at Los Angeles Trade-Technical College. He built this company around one standard: clean ducts, straight answers, that’s the whole job.
We also service Lennox, Trane, and Carrier equipment, so when we look at your Nikro setup we’re seeing it the way a full-system tech sees it, not a brand specialist with tunnel vision. Every job gets a written price before work starts. Every job gets our 365-Day Done Right Promise: if the seal fails within a year, we return and make it right at no charge, including the second visit. That’s The Garrison Standard, and it’s in writing.
Nikro Duct Sealing FAQs
No. Sealing the ductwork with mastic and UL-rated tape does not modify your Nikro machine itself, so it won’t void the manufacturer’s equipment warranty. We never open the machine housing or alter internal components. The ductwork is a separate system, and sealing it is standard HVAC practice.
We schedule within a few days for most Los Angeles locations, and our phones are answered by a live person around the clock, so you won’t wait for a callback. We don’t promise same-day dispatch. We promise to show up inside the window we give you and to do the job once, correctly. Call (361) 326-5060 to get a date on the calendar.
If the machine itself runs, your problem is almost always the ductwork. We’ll tell you the truth either way: if your Nikro unit has life left, sealing the ducts is the right spend. If the machine is failing, we’ll say so and you can put your money where it belongs. We don’t upsell duct sealing on a system that needs replacing.
We test the system before and after we seal, and you’ll see the difference in airflow at registers that were previously weak. We also document what we sealed with photos so you know exactly what you paid for. Before-and-after photos of your own ductwork come with every job, not as a premium add-on.
Because they’re quoting a per-vent price that sounds cheap but multiplies fast once the technician is inside your home. We give one flat price for the whole system, in writing, before work starts. That number does not change. If a quote seems too good to be true in this trade, it usually is. Call (361) 326-5060 and we’ll give you a number that means something.
Written by Roy Castellanos, Owner, Hollis Air Duct Cleaning at Hollis Air Duct Cleaning, serving Los Angeles and nearby areas.