Fast, Reliable HVAC Cleaning Across San Marcos
HVAC cleaning in San Marcos typically runs $280-$650 for a complete system service, and most jobs are finished in a single visit. We’re Bellows Air Duct & Vent Co. of Texas, and we’ve been driving out to San Marcos from Houston since 1984 to clean evaporator coils, blowers, condensers, and full air handlers for homeowners who want it done right and never need to think about it again. Call (866) 347-2063 for a free estimate - we’ll give you the full price before we lift a single tool.
San Marcos sits directly on the Balcones Escarpment, making it ground zero for the Hill Country’s Ashe juniper (mountain cedar) pollen, which blankets the region from December through February in concentrations that routinely send allergen counts off the charts. That pollen doesn’t stay outside. It gets pulled into your return vents, past your filter if it’s clogged, and cakes onto your evaporator coil and blower wheel. Meanwhile, the high relative humidity near the San Marcos River springs - a constant 72°F year-round - creates condensation conditions inside ductwork that promote microbial growth in ways drier Hill Country cities farther west do not see. We’ve cleaned systems in the 78666 zip code where the coil looked like it was wrapped in green felt.
Our HVAC Cleaning team knows the difference between a quick vent vacuum and a proper system cleaning. We’re familiar with the rental corridors near Texas State, the acreage properties stretching toward Kyle, and the newer subdivisions pushing into the Hays County growth corridor. We’ll be there when we say.
Why Bellows Air Duct & Vent Co. of Texas Is San Marcos’s Preferred HVAC Cleaning Company
We’ve built our reputation in San Marcos the same way we have everywhere else - by showing up, doing what we promised, and standing behind it. Wade Kellerman has led this company since its founding in 1984, and the 90-Day Done Right Promise he established is still stamped on every job: if it’s not right, we make it right, no paperwork, no arguing.
Our technicians are background-checked, uniformed, and equipped with Rotobrush and Nikro portable systems that let us reach flex-duct junctions in older apartment complexes and navigate the longer duct runs common on San Marcos acreage properties. Calls are answered by a live person, 24 hours a day - not a voicemail, not an app. Most San Marcos customers who call in the morning have their cleaning completed that afternoon.
We don’t bait with coupons. The price we quote on the phone is the price on the invoice. That’s been our practice for over 42 years, and it’s why homeowners in San Marcos who’ve been burned by low-bid operators call us back when they move to their next house.
Our HVAC Cleaning Services in San Marcos
Evaporator Coil Cleaning
The evaporator coil is where your system works hardest in San Marcos. With over 220 days per year of air conditioning runtime, that coil stays wet and stays busy. Add mountain cedar pollen from December through February, and you’ve got a sticky mat that reduces heat transfer and drives up your electric bill. A typical evaporator coil cleaning in San Marcos runs $180-$340. We use foaming cleaners and low-pressure rinses that won’t damage the fins, then camera-verify the result before we close the access panel.
Blower Cleaning
Your blower wheel moves every cubic foot of air your home breathes. In San Marcos rental properties near Thorpe Lane and the university-adjacent complexes, we routinely find blowers caked with stratified layers of cedar pollen, pet hair from successive renters, and mold from the river-corridor humidity. On a Thorpe Lane apartment complex near Texas State, our crew tackled an evap coil and blower that hadn’t been cleaned in four tenant cycles - layers of cedar pollen, pet dander, and mold from the perpetual river-corridor humidity had reduced airflow by 40%. We used the Rotobrush portable system to reach every flex-duct junction, restoring 25% more CFM without needing a second trip. Blower cleaning in San Marcos typically costs $150-$280.
Condenser Cleaning
Your outdoor condenser coil fights cottonwood fluff from the river corridor, dust from Caldwell County caliche roads, and the same cedar pollen that coats everything else in San Marcos. A dirty condenser can’t reject heat efficiently, so your compressor runs longer and hotter. We disassemble the cabinet when needed, clean the fins with proper fin combs, and verify amp draw before we leave. Condenser cleaning in San Marcos generally runs $120-$220 as a standalone service, or it’s bundled into a full system cleaning.
Air Handler Cleaning
The air handler is the central station - blower, coil, drain pan, and filter rack all in one cabinet. In San Marcos’s 1990s and 2000s-era apartment complexes, these units often sit in closet-sized mechanical rooms with flex-duct crimping and disconnection from rapid tenant turnover. We inspect every junction with our camera system, seal what needs sealing, and clean what needs cleaning. Full air handler cleaning in San Marcos runs $320-$520 depending on accessibility and contamination level.
Coil Treatment
For San Marcos homes where microbial growth is recurring - especially properties near the river where humidity stays elevated - we apply an EPA-registered coil treatment that inhibits mold and bacteria regrowth for up to six months. This isn’t a substitute for cleaning; it’s a protective step after the coil is clean. Coil treatment adds $85-$140 to a cleaning service. New-construction homes in 78666 outskirts often benefit from this after their initial post-build cleaning, since drywall dust and construction debris settle in the air handler and coils in ways that standard builder cleanings miss.
What happens when you call
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A real person answersNo phone trees - you reach a local pro.
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You get an upfront price rangeHonest numbers before anyone is dispatched.
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A background-checked tech heads outLicensed & insured, dispatched right away.
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You approve before work beginsNothing starts until you say go.
Trusted Brands We Service in San Marcos
We clean systems built with Honeywell and Aprilaire components, and we carry common replacement parts for these brands on our San Marcos service vehicles. That means when we find a cracked drain pan or a failing contactor during your cleaning, we can often replace it same-day rather than ordering parts and scheduling a return trip. Our Rotobrush portable systems and Nikro HEPA vacuums are the same equipment serious HVAC contractors specify for their own duct work - not consumer-grade shop vacs with a brush taped to the hose. For San Marcos homeowners, that translates to faster turnaround and one honest price shown before we start.
Common HVAC Cleaning Problems We See in San Marcos Homes
- Heavy-duty acreage systems get undertreated. Homeowners on rural properties with detached workshops often schedule only a basic vent cleaning, missing the heavy-duty blower and coil service their oversized door springs and longer duct runs demand. These systems work harder and longer than standard suburban units, and they need correspondingly thorough cleaning.
- Texas State rental units accumulate multi-tenant debris. Rental landlords near Texas State skip duct sealing, so flex-duct crimping and disconnection from rapid tenant turnover leaves debris bypassing the filter entirely. We’ve found apartments where the return duct was pulling air from the wall cavity, not the living space.
- New construction carries hidden dust loads. Newer master-planned subdivisions pushing into the Hays County growth corridor add fresh construction with its own post-build drywall dust and debris issues. Builders rarely provide the coil treatment regimen that prevents this dust from cementing onto wet coils.
- River-corridor humidity drives microbial growth. The 72°F spring water and high relative humidity near the San Marcos River create condensation conditions inside ductwork that drier Hill Country cities like Dripping Springs or Fredericksburg simply don’t experience. We’ve cleaned supply plenums in 78666 that were visibly speckled with mold colonies.
Pricing for HVAC Cleaning in San Marcos, TX
Here’s what honest pricing looks like for HVAC Cleaning in San Marcos:
- Evaporator coil cleaning: $180-$340
- Blower cleaning: $150-$280
- Condenser cleaning: $120-$220
- Air handler cleaning (full): $320-$520
- Coil treatment: $85-$140
- Complete system cleaning (coil + blower + condenser + camera inspection): $280-$650
What moves you within these ranges? Accessibility matters - a coil buried in an attic with a scuttle hole costs more than one in a hallway closet. Contamination level matters - four tenant cycles of cedar pollen takes longer than a routine maintenance clean. Duct sealing repairs are quoted separately after camera inspection. We disclose every cost before we start, and the number on the phone is the number on the invoice. No bait coupons, no price changes at the door. We also offer a permanent 5% Senior and Veteran discount, and our $89 Seasonal Tune-Up can catch problems before they need full cleaning.
We Also Serve Cities Near San Marcos
Our service area extends to Kyle, Buda, Shady Hollow, and Canyon Lake - the same Hill Country conditions, the same honest pricing, the same 90-Day Done Right Promise. Whether you’re on acreage outside Kyle or in a Canyon Lake weekend home that needs seasonal prep, we drive to you with the same equipment and the same upfront quote.
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 - HVAC Cleaning in San Marcos
San Marcos sits directly on the Balcones Escarpment, placing it in the highest-concentration zone for Ashe juniper pollen in Texas. That pollen is microscopic, barbed, and extraordinarily adhesive - it sticks to wet evaporator coils and blower wheels, forming dense mats that standard fiberglass filters can’t stop once they’re saturated. The pollen season runs December through February, which in San Marcos overlaps with heating season, so your system is actively circulating and concentrating it. Call (866) 347-2063 and we’ll inspect your filter rack and coil condition - estimates are free.
Yes. Acreage properties typically have longer duct runs, more elbows and junctions, and often a separate system for the workshop that gets forgotten. These systems run harder because they’re heating and cooling larger volumes, and the blowers and coils accumulate debris faster than standard suburban units. We use portable Rotobrush equipment to reach remote air handlers, and we inspect for flex-duct damage from rodent activity common in rural settings. Acreage system cleaning in San Marcos typically runs $380-$720 depending on the number of air handlers.
The San Marcos River springs maintain 72°F water year-round, creating a persistent humidity bubble that keeps ductwork surfaces wet longer than in drier Hill Country locations. That moisture, combined with cedar pollen and organic dust, provides ideal conditions for mold and bacterial growth inside supply plenums and trunk lines. We address this with thorough drying after cleaning, and we offer coil treatment for properties where regrowth is recurring. The humidity also means your system runs longer cycles, so clean coils and blowers matter more for efficiency here than they would in, say, Fredericksburg.
For high-turnover rentals near Texas State, we recommend full HVAC cleaning between every major tenant cycle - typically every 12 to 18 months. The combination of cedar pollen, pet dander from successive renters, and the flex-duct degradation common in 1990s-era complexes means filters alone aren’t sufficient. We also camera-inspect for duct disconnection, which is common in these buildings and allows debris to bypass filtration entirely. Regular cleaning protects your equipment, reduces service calls, and gives new tenants a documented clean start. Call (866) 347-2063 for landlord package pricing - estimates are free.
Yes. We clean new-construction HVAC systems in the 78666 outskirts where post-build drywall dust and construction debris settle in air handlers and coils. Builders typically provide a single rough cleaning that misses the fine particulate that cakes onto wet coils. We recommend an initial cleaning before occupancy, followed by coil treatment to prevent the cementing effect of construction dust combined with San Marcos humidity. New-construction cleaning in 78666 typically runs $240-$420 depending on system size and debris level.
Written by Wade Kellerman, Owner at Bellows Air Duct & Vent Co. of Texas, serving San Marcos since 1984.