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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AfterFast, Reliable HVAC Cleaning Across San Marcos
HVAC cleaning in San Marcos, TX typically runs $395 – $685 for a complete system cleaning, and the honest answer is most homes here genuinely need it every 3 – 5 years because of the limestone dust that settles into ductwork faster than in neighboring towns. We work throughout San Marcos weekly, from the Blanco Riverwalk area to the neighborhoods off Ranch Road 12 and Hopkins Street, so we know exactly what your system is up against. If your vents are blowing a fine chalky film onto furniture or your AC coil looks like it’s been dusted in powdered sugar, that’s the Edwards Aquifer geology at work. Call (737) 727-2314 and we’ll give you a written flat price per system before any work starts.
Why Cardinal Air Duct Cleaning Is San Marcos’s Preferred HVAC Cleaning Company
San Marcos homeowners call us back because we show up with professional-grade equipment and a written price that doesn’t move once we’re inside. Our technicians run Rotobrush rotary brush systems with Nikro HEPA vacuums, and they use Abatement Technologies containment units so the dust we loosen doesn’t drift into your living room. Every tech is background-checked and uniformed, and you’ll know their name before they ring the bell. We’re part of the Relay Home Co. family, founded in 2005, and that means every booking carries The Relay Visibility Guarantee: a live trackable arrival window, before-and-after photos of your own ducts, and a digital invoice payable from your phone.
Omar Haddad leads our team, and the standard he set is simple: if the work isn’t right within 365 days, we return and fix it at no charge. That’s the 365-Day Done Right Promise, and it applies to every single job. No carve-outs, no fine print. Scheduling for San Marcos is coordinated through our Austin office, and crews serve San Marcos locally on a regular weekly route.
Furnace Duct Cleaning in San Marcos
Furnace Duct Cleaning in San Marcos means clearing the full supply and return duct network plus the furnace cabinet, blower assembly, and heat exchanger of the calcium-carbonate film that Edwards Aquifer limestone sends through your system every time the furnace cycles. In San Marcos homes, this chalky buildup is the single biggest reason airflow drops by year five after a cleaning. A standard furnace duct cleaning here runs $395 – $685 for a single system home, depending on square footage and how many returns the house has. You’ll get one flat price per system before we touch anything, not a per-vent quote that climbs once the technician starts counting registers.
What Actually Happens During the Job
We cut access points into the supply and return plenums, connect a Nikro HEPA negative-pressure unit to draw the entire duct system into a vacuum, then agitate every branch line with a Rotobrush rotary brush. The debris gets pulled into the vacuum canister, not pushed back into your rooms. We clean the furnace cabinet, blower wheel, and heat exchanger in the same pass, then photograph the before-and-after of each section so you see exactly what left your ducts.
Signs Your Furnace Ducts Need It in San Marcos
If your supply registers have a fine white-gray film that comes back a week after dusting, that’s aquifer dust. If your furnace blower sounds like it’s working harder than it used to or the burners cycle more often, reduced airflow from coated duct walls is the usual culprit. Spring-fed humidity along the San Marcos River also promotes biological growth inside return ducts, and that needs HEPA extraction and a microbial treatment, not just a heavy vacuuming.
AC Coil Cleaning in San Marcos
AC Coil Cleaning in San Marcos is the highest-ROI HVAC cleaning you can do, because the evaporator A-coil inside your air handler is exactly where limestone dust and river humidity combine into a crusted layer that chokes your cooling. In San Marcos, a coil cleaning runs $225 – $395 for the evaporator coil, and it’s usually paired with blower wheel cleaning for another $125 – $225. The condenser coil outside picks up river-bottom silt and pollen from the pecan and live oak canopy, and cleaning it runs $125 – $195. We price each of these as one flat cost, agreed before the work begins.
Evaporator Coil Cleaning Deep Clean
We remove the coil access panel, apply a professional-grade foaming cleaner to dissolve the calcium-carbonate crust, then flush the coil with low-pressure water into a capture basin. After that, we coat the coil with an anti-microbial treatment approved for HVAC use. You’ll see the coil before and after with your own eyes.
Blower Motor Wheel Cleaning
A fouled blower wheel spins off balance and pulls more amps, which shortens the motor’s life in San Marcos homes by a measurable margin. We pull the blower assembly, clean each fin with compressed air and a brush, then reinstall and verify airflow. If the motor bearings are already worn from years of dust loading, we’ll tell you plainly and give you a written replacement price before ordering parts.
Trusted Brands We Service in San Marcos
We clean and service HVAC systems from every major manufacturer found in San Marcos homes: Carrier, Trane, Lennox, Rheem, Goodman, American Standard, Bryant, and Daikin. Our techs also install and service filtration products from Honeywell, Aprilaire, and Guardsman, so if your media cabinet is ready for a filter upgrade, we can handle it in the same visit. Because we run weekly routes through San Marcos, Kyle, New Braunfels, Buda, and Canyon Lake, common filters and replacement parts for these brands are stocked on our trucks. You won’t wait a week for a part to ship from a warehouse.
Common HVAC Cleaning Problems We See in San Marcos Homes
- Blower motor wheels coated in aquifer dust: The calcium-carbonate load near the Edwards Aquifer recharge zone cakes onto blower fins and throws the wheel off balance. In a 2004 Blanco Riverwalk home, our camera inspection caught a blower wheel so loaded it was pulling 20% more amps than spec. We cleaned it, rebalanced, and the homeowner’s son’s asthma eased within days.
- Mold growth in return ducts near the river: Homes within a mile of the San Marcos River or Willow Creek carry higher interior humidity, and return ducts that pull from unconditioned crawl spaces grow biological film fast. A HEPA vacuum alone won’t stop it; we apply an anti-microbial treatment after source removal and photograph the duct interior before and after.
- Clogged A-coils from limestone film plus pet hair: San Marcos has a higher-than-average pet ownership rate, and the combination of hair and calcium-carbonate dust forms a mat on the evaporator coil that standard filter changes never catch. This is the number one reason AC systems in San Marcos freeze up in July.
- Dryer vent lint cross-contamination: When contractors price per vent, they tend to rush the lint pathway between the dryer vent and the HVAC return. We clean both in a flat per-system scope, because a lint-loaded return is a fire risk you shouldn’t have to negotiate over.
Pricing for HVAC Cleaning in San Marcos, TX
A complete HVAC cleaning in San Marcos runs $395 – $685 for a single system, one thermostat, one air handler. That includes supply ducts, return ducts, blower wheel, evaporator coil, furnace cabinet, heat exchanger, and a final camera inspection of representative sections. Add a second system and you’re looking at roughly $295 – $385 more, depending on duct count. What changes the final number in San Marcos specifically is house age and proximity to the river: pre-2000 homes in the Blanco Riverwalk and Mill Street corridors often have flexible duct that’s harder to agitate safely, and higher-humidity homes near the water sometimes need a microbial treatment. We give you the written price before any work starts, and that’s the price. Call (737) 727-2314 for a free estimate and we’ll tell you exactly what your system needs and what it costs.
We Also Serve Cities Near San Marcos
Our San Marcos routes also cover Kyle, New Braunfels, Buda, and Canyon Lake. If you’re in one of those towns, you’ll get the same flat per-system pricing, the same before-and-after photos, and the same 365-Day Done Right Promise. If you want to see our full service area, visit our HVAC Cleaning hub page to learn more about how the process works and what it includes.
Serving San Marcos, TX - Our Local Coverage Area
We’re based in the San Marcos area and know this community well. Use the map below to see our service coverage - if you’re nearby, we can almost certainly help.
FAQs About HVAC Cleaning in San Marcos
In San Marcos, every 3 to 5 years is the honest interval for a full HVAC cleaning, because Edwards Aquifer limestone dust loads your ducts faster than in Kyle or Buda. If your system is under two years old, you don’t need it yet. If you’ve had major renovation dust, a water intrusion, or visible mold growth, you need it now, not on a calendar schedule. The best test is a camera inspection of your supply and return ducts before committing. Call (737) 727-2314 and we’ll scope it and show you the footage.
We charge one flat price per system, written down and agreed to before any work starts. Per-vent pricing is how lowball quotes become inflated invoices once the technician is in your hallway counting registers. You’ll see the full scope, the full price, and your technician’s name before they walk in.
We create negative pressure in your duct system with a Nikro HEPA vacuum, then agitate each supply and return branch with a Rotobrush rotary brush so the loosened debris goes straight into the vacuum canister. We clean the furnace cabinet, blower wheel, heat exchanger, and evaporator coil in the same job, then take before-and-after photos of your actual ducts. That’s the NADCA-standard source removal method, and it’s what separates real cleaning from a truck-mounted shop vac pass.
San Marcos sits on the Balcones Escarpment, where Edwards Aquifer limestone weathers into an exceptionally fine calcium-carbonate dust that rides the air and settles as a chalky white-gray film. It’s visibly different from the darker organic dust you’d find in Kyle or Buda, and it’s the primary reason coils and blower wheels here clog faster. A generic cleaning that doesn’t agitate each branch line leaves that film behind.
No. HVAC cleaning is a scheduled job and doing it thoroughly takes hours, not a lunch break. We book a live arrival window you can track through The Relay Standard, and when we arrive, we stay until the job is done right, not until the clock runs out. Call (737) 727-2314 to find the next open slot on our San Marcos route.
If your AC is blowing harder and cooling less, or your vents carry a fine white dust that won’t stay gone, call (737) 727-2314. We’ll give you a straight answer, a written flat price per system, and before-and-after proof of exactly what came out of your ducts. Omar Haddad and our San Marcos team are ready to make your system breathe clean again.
Written by Omar Haddad, Owner at Cardinal Air Duct Cleaning, serving San Marcos and the surrounding area.