How Much Does Air Duct Cleaning Cost in St. Louis? [2025 Data]

Air duct cleaning costs in St. Louis average $379, and local prices fall between $291 and $477 for most homeowners. Prices depend mostly on the size of your home or the number of vents you have that need cleaning, depending on how your pro charges. The above-average home age in St. Louis can raise costs if you have outdated vents that take longer to clean or if you also need air duct repairs.

Air Duct Cleaning Cost Factors

Some homeowners in St. Louis, MO, pay as little as $150 for air duct cleaning, while some jobs can cost as much as $690. Most of your total will go toward labor, so where in that range your price falls will depend mostly on factors that affect how long the cleaning takes, like the size of your home, the number of vents you have, and how accessible your system is.

Total Square Footage of Vents

The more ductwork you have, the more you'll pay for cleaning. Some local air duct cleaners base their price on the property’s square footage since the larger your home is, the more ductwork you'll have.

The cost of cleaning ductwork is $0.15 to $0.30 per square foot. The average home in St. Louis is just over 1,600 square feet, which means most residents will pay somewhere between $240 and $480. Here’s a breakdown of average air duct cleaning costs based on the size of your home:

Number of Vents

Some pros in the St. Louis area charge based on the number of vents you have that need cleaning rather than on your home’s square footage. As with ductwork, the more vents you have, the more it’ll cost to clean them. On average, vents cost $35 each to clean, with most homeowners paying between $25 and $50 per vent. To get a ballpark estimate for the cost of vent cleaning, count the vents in your home and multiply that by $35.

The standard in HVAC system design is to have one vent for every 100 to 150 square feet of living space. With the average home in the area sitting at 1,600 square feet, you’re likely to have between 10 and 16 vents, which would bring costs to between $350 and $560.

Here’s how the number of vents affects your air duct cleaning cost:

Type of Ductwork

There are four primary types of ducts in residential HVAC systems. Metal sheet ducts, fiberglass ducts, and fiberboard ducts all have smooth interior walls and are easy and affordable to clean, while ribbed flex ducts require special cleaning equipment, so you’ll pay more to clean them.

The average home in St. Louis was built in 1966, which was before metal sheet ducts became the standard. Fiberboard ducts are common in the area, and while they’re just as affordable to clean as modern metal sheet ducts, they’re more likely to need duct repairs, which can add to your total expenses.

Labor Cost

Most ductwork pros charge by the hour, with duct cleaning services in St. Louis priced between $90 and $120 per hour. Depending on the size of your home, the type of ductwork you have, and how accessible the ducts are, most cleaning jobs require three to eight hours of labor. On a per-hour basis, you’ll pay slightly below what you would in most other cities because the cost of living in St. Louis, which drives labor prices, is below the national average.

Accessibility

If you ensure that vents are easy to reach with vacuuming equipment, accessibility shouldn’t be a problem. But some ductwork designs make accessing them difficult, especially if you don’t have floor vents. If air duct technicians have to work harder or take additional steps to reach your vents, it can result in additional labor charges.

Inspections

Some vent problems, like noticeable mold or nests, don’t require an inspection before cleaning. However, if you aren’t sure about the state of your vents, consider arranging a professional inspection. These inspections are often bundled together as part of an HVAC inspection, which costs an average of $300 but can fall under $100 for simple systems.

Level of Cleanliness or Contamination

Duct cleaning is offered as a package with set labor costs, but extremely dirty jobs will cost extra. If the ducts have never been cleaned and need a lot of work to remove dust and buildup, expect additional fees.

St. Louis has relatively poor air quality conditions, with the Environmental Protection Agency (EPA) reporting that there are 249 days per year in the city where conditions are at least moderately concerning. Pollution and pollen can both contribute to filth in your ducts, which can lead to higher costs for more intensive cleaning. Consider scheduling cleaning a bit more often than you would in other cities—every two to four years is best in St. Louis.

Air Duct Cleaning Pro Costs

On average, somewhere between 90% and 95% of your total costs will go toward labor when you hire a professional air duct cleaning company in St. Louis, which means an average of between $340 and $360. Hourly rates are slightly lower in St. Louis than they are elsewhere due to a below-average cost of living helping to keep labor costs affordable.

Sales Tax

In addition to labor, you’ll also need to pay sales tax to your pro. The sales tax rate in St. Louis is 9.68%, including state and city taxes, so you’re looking at a total of $36.69 in taxes.

Does Air Duct Cleaning Increase Home Value?

Air duct cleaning is an ongoing maintenance item that doesn’t contribute to the visual appeal of your home, so it won’t increase your home value in most cases. However, some buyers might have a bit more confidence in your home if duct cleaning gives the impression that you’ve kept up with other routine maintenance items, too.

If your tech points out air duct repair opportunities while cleaning, you could also boost your home’s energy efficiency, which means lower utility bills in the cold St. Louis winters and the hot summers.

How Angi Gets Its Cost Data

Home is the most important place on earth, which is why Angi has helped more than 150 million homeowners transform their houses into homes they adore. To help homeowners with their next project, Angi provides readers with the most accurate cost data and upholds strict editorial standards. We survey real Angi customers about their project costs to develop the pricing data you see, so you can make the best decisions for you and your home. We pair this data with research from reputable sources, including the U.S. Bureau of Labor Statistics, academic journals, market studies, and interviews with industry experts—all to ensure our prices reflect real-world projects. 

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