Air Duct Cleaning Cost in San Marcos, Texas
Our 2026 estimate for air duct cleaning in San Marcos, TX is $320 to $720 (whole house). That puts San Marcos 10% below the national average, mainly because of lower local labor costs.
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San Marcos Weather and HVAC Load
NOAA's 1991-2020 climate normals put San Marcos at 1,620 heating degree days and 2,973 cooling degree days per year. Cooling carries most of the load, which is why compressors and condenser fan motors wear out faster here than in northern cities. A normal year brings 20 nights at or below freezing and 117 days over 90°F.
| Heating degree days / year | 1,620 |
|---|---|
| Cooling degree days / year | 2,973 |
| Nights at or below 32°F | 20 |
| Days above 90°F | 117 |
| Average low / high | 57.2°F / 80.1°F |
San Marcos Housing Stock
Census figures put the median build year in San Marcos at 1998, so a typical house here has about 28 years on it. Plenty of houses from this period still run original 1990s or early-2000s equipment, which is past its expected service life. About 8,400 households here own their home, 30.5% of the occupied total. The median home value is $269,700, and median household income is $51,030. We use both figures to adjust labor and pricing for this page.
Between 2020 and 2025, NOAA's Storm Events Database logged 15 hail days and 13 days with damaging thunderstorm winds in Hays County. The largest hail reported was 3 inches across. Hail flattens the thin aluminum fins on condenser coils and cuts airflow. After a big storm, take a look at the outdoor unit; homeowners insurance often covers the damage.
When to Book It
- Dust puffs out of the vents when the system starts
- You just finished a remodel
- Signs of mice or insects in the ducts
- You moved into a house with no maintenance records
What Moves the Price
- House size and duct layout
- Adding a dryer vent cleaning
- How many supply and return vents the house has
- How hard it is to reach ducts in the attic or crawlspace
- Sanitizing or mold treatment
We lowered the national figures about 10% for San Marcos using local income, home values and the equipment size this climate needs. Real bids can still come in outside the range, so collect three written quotes.
What the Quote Should Cover
- Cleaning the blower compartment
- Before-and-after photos
- Cleaning the registers and grilles
- Cleaning under negative pressure with a truck or portable vacuum
- Inspecting the supply and return ducts
Texas Permits, Efficiency Rules and Rebates
Texas is in the DOE's Southeast region, where new split central air conditioners need at least 14.3 SEER2 (13.8 SEER2 for systems of 45,000 BTU/h and up).
Before You Hire
- Watch out for $99 whole-house deals. They tend to turn into upsells once the crew is inside.
- Ask whether the company follows NADCA standards.
- If the ducts leak, have them sealed during the same visit.
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Air Duct Cleaning Questions from San Marcos Homeowners
How much is air duct cleaning in San Marcos?
Plan on $320 to $720, with most jobs near $540. Equipment efficiency, house size and the condition of the ducts and wiring decide where your quote falls.
When is the best time to schedule air duct cleaning in San Marcos?
Between late fall and early spring. With 117 days over 90°F, San Marcos contractors are booked solid all summer, and off-season jobs are easier to schedule and negotiate.
Does duct cleaning lower energy bills?
Not by much. Sealing leaky ducts makes a much bigger difference to efficiency and comfort.
How often should ducts be cleaned?
There's no set schedule. The EPA recommends cleaning when there's visible mold, pests or a lot of debris, not on a routine basis.
Air Duct Cleaning Near San Marcos
- Kyle $370 to $840
- New Braunfels $370 to $840
- Cedar Park $440 to $1,000
- Harlingen $300 to $680
- Missouri City $370 to $850
- North Richland Hills $380 to $860
- Flower Mound $480 to $1,100
- Rowlett $400 to $920
Sources: U.S. Census Bureau ACS 5-year estimates 2019-2023 and 2024 population estimates; NOAA NCEI U.S. Climate Normals 1991-2020, station San Marcos; NOAA Storm Events Database 2020-2025, Hays County. Prices are our estimates, not contractor quotes. Updated 2026.