Clean vent register grille on the wall of a home

Same-day air duct service in San Marcos, TX

Air Duct Servicesin San Marcos, TX

In San Marcos, the air conditioner is not an appliance - it is life support for half the year, and the ductwork carrying that air runs through attics hot enough to bake it. We clean the system from the main trunk out, inspect it on camera and seal the leaks that waste cooled air by the hour.

Call (888) 258-5005 See reviews Fastest way in is a call — or send the form and we call you back.

100+ 5-Star Reviews Facebook Instagram Licensed & Insured 10+ Years Experience Same-Day Service

Your information is kept private and used only for your air duct service request.

Request received.

We'll call you back shortly to confirm your time.

Need it faster? Call now

Air Duct Service Co — San Marcos, TX

Every air duct service, one San Marcos call

From a new build full of construction dust to an older system losing air overhead, these are the six duct services San Marcos homeowners book with us. Below is air duct in San Marcos, TX in full — every service, the local conditions and the areas covered.

Technician feeding an air whip into a floor vent in a home living room

Cleaning & Care Air Duct Cleaning

Our negative-air machine seals onto the main trunk duct and puts the whole system under suction first. Then each run is scrubbed individually, so years of dust and debris travel one way only — out of the ducts and into the machine. The visit also covers the returns, where a leaking return has often been pulling attic dust straight into the system. Air Duct Cleaning in San Marcos, TX is one call away, every day of the week.

Get a free estimate

Technician inspecting a ceiling return vent with a flashlight inside a home

Cleaning & Care Air Duct Inspection

For a San Marcos new build, the inspection shows exactly how much construction dust the system started life with. A camera goes inside your ductwork so you can see exactly what's in there — buildup, damage or blockages — before we recommend anything. Inspections are free. It is why air duct inspection in San Marcos, TX keeps getting recommended to neighbors.

Get a free estimate

Technician joining a duct section back together in a home attic

Repair Air Duct Repair

Crushed, torn or disconnected ducts leak the air you pay to heat and cool. Sagging runs get re-strapped with proper support spacing, so the sag - and the dust trap it creates - does not come back. We repair and rebuild damaged sections so airflow is strong and even again. The crews behind air duct repair in San Marcos, TX are the same ones who cover the ZIP codes listed below.

Get a free estimate

Technician connecting a new flex duct to the furnace inside a home

Install & Replace Air Duct Installation

New duct runs for additions, remodels and system upgrades — sized, sealed and balanced so every room gets its share of heating and cooling. Dual-system homes get each floor planned on its own, so the upstairs stops inheriting the downstairs system's compromises. Booking air duct installation in San Marcos, TX takes one call, and the tech arrives with everything the job needs.

Get a free estimate

Technician brushing mastic sealant onto a duct joint in a home attic

Repair Air Duct Sealing

Leaky joints quietly waste a big share of your airflow. We seal seams and connections with professional mastic for a tighter, more efficient system. Returns get sealed too, so the system stops pulling hot attic air through gaps in the return run. When neighbors talk about air duct sealing in San Marcos, TX, this is the visit they mean.

Get a free estimate

Two technicians cleaning the ductwork in a home with a professional duct machine

Cleaning & Care Commercial Air Duct Cleaning

Offices, restaurants, retail and multi-unit buildings across San Marcos — scheduled commercial duct cleaning with the same negative-air machine sealed onto the trunk, keeping your space comfortable, compliant and breathing clean. Around San Marcos, multi-unit buildings get a unit-by-unit plan, with each system cleaned from its own trunk. The crews behind commercial air duct cleaning in San Marcos, TX are the same ones who cover the ZIP codes listed below.

Get a free estimate

Need something else — a damper, a blower, a smoke problem, a bird in the flue? We cover all 27 air duct specialties. Call (888) 258-5005 and describe it.

Local conditions

San Marcos ducts have San Marcos problems

A duct system in San Marcos cools through a brutal, months-long season from inside a superheated attic. This is what we actually find here, and what we check on every visit.

Attics that cook the ductwork

A San Marcos attic on a summer afternoon is one of the harshest places any building material works. Flex duct jackets age fast, tape dries and lets go, and straps stretch - so joints separate quietly overhead while the AC runs longer every year to hold the same temperature.

Cooling the attic by accident

When attic joints separate, a San Marcos system spills cooled air into the one space that never needs it. The rooms below drift warm, the unit runs near-constantly on the hottest days, and the cause sits overhead: leaks that sealing fixes for good.

Slab homes, all-attic systems

With no basements, San Marcos ductwork lives entirely in the attic - long flex runs snaking over joists, sagging between straps and kinking at turns. A sagging run traps dust and slows airflow; a kinked one starves the room it feeds, usually the far bedroom.

Dust storms and dry wind

Dry, windy stretches blow fine soil dust across Hays County and into every house, through door gaps, attic vents and the system itself. It is abrasive, it loads filters quickly, and what passes the filter settles in the low spots of the trunk and returns.

San Marcos sits in Hays County, and the ZIP list at the bottom of this page covers 1 serviceable ZIP codes — 78666 through 78666. The closest served neighbors are Martindale, Kyle, Niederwald, and every one of them is covered by the same crews, the same day, under the same number: (888) 258-5005.

Cold air duct? Warm answer.

Same-day service, free estimates, licensed & insured — and a air duct that lights when you click the remote.

Call (888) 258-5005 Request a quote

Questions

Asked the way San Marcos asks

Why does my AC run all day and still not cool?

Before blaming the unit, check the ducts. In San Marcos, separated attic joints and leaking returns are behind a large share of weak-cooling calls: the system loses cooled air overhead and pulls hot attic air in its place. An inspection shows both on camera, and sealing plus repair often restores cooling the equipment always had.

How do you clean the ducts - what is the process?

Our negative-air machine seals onto the main trunk duct and puts the whole system under suction first. Then each individual run is scrubbed on its own, so loosened dust travels toward the trunk and into the machine - never back into your rooms. We finish at the registers and show you the before-and-after on camera.

Can dirty ducts make allergies worse here?

They hold the reservoir. Cedar, oak and grass pollen collect in the returns across their seasons and keep recirculating between them, so a San Marcos house can feel pollinated in a month when nothing outside is blooming. Cleaning the trunk and returns removes that stored load.

What are the signs my ducts are leaking?

Rooms that never reach the set temperature, an AC that runs long cycles on ordinary days, dust that returns quickly after cleaning and an attic hatch that feels cool when the system runs. Failed tape in attic heat is the standing San Marcos culprit, and mastic sealing is the lasting repair.

We just bought a new build - is cleaning needed already?

Often, yes. In fast-growing areas around San Marcos, systems run during construction, and drywall dust packs into new ductwork before move-in. The free camera inspection settles it in minutes - if the trunk is clean, we say so and leave.

Do you give prices over the phone?

No — and be wary of anyone who does. Every duct system is a different size and condition, so a phone price is a guess that changes at your door. Our inspections and estimates are free: a tech looks inside your actual ductwork first, then gives you one clear price before any work starts.

Where we work

San Marcos, TX ZIP codes we serve

Air Duct Service Co is a national company with local technicians serving San Marcos street addresses across the ZIP codes below — same-day service and free estimates, every day 8 AM – 8 PM. More of Texas is covered from our Texas page. The San Marcos list below covers 1 ZIP codes, 78666 through 78666.

78666

Don't see your ZIP? San Marcos also uses P.O. Box and single-organization ZIP codes that have no street addresses — call (888) 258-5005 and we will confirm coverage for your street address on the call.

Also serving nearby: Martindale, TX · Kyle, TX · Niederwald, TX · Uhland, TX · Wimberley, TX · Woodcreek, TX.