What causes musty smells?

• <div><p>Figuring out why you have a musty smell in your house is the first step to getting rid of it. <a href="https://www.angi.com/articles/mold-vs-mildew.htm">Mold or mildew</a> is most likely causing the unpleasant odor. People use these terms interchangeably, but they’re actually different.</p><p>Mold is a fungus that loves to grow in moist, humid places. It’s typically black or green and has a raised, uneven texture. Stay vigilant for <a href="https://www.angi.com/articles/signs-mold-might-be-growing-your-home.htm">signs mold may be growing in your home. </a></p><p>You’ll find mildew growing on your shower walls and in your bathroom’s nooks and crannies. It’s a specific type of mold that grows flat. Mildew is usually white, gray, or yellow.</p></div>

Get matched with top air duct cleaners in Fairfax, MO

Q: What's the best time of year to test for leaks in ducts?

• <div><p>The best time to schedule an air duct leakage test is during the mild spring or fall seasons. During these times, your HVAC system is not under extreme demand for heating or cooling, making it easier to identify and address any issues with the ductwork. Additionally, scheduling the test during these seasons allows you to optimize your HVAC system's efficiency before the more challenging summer or winter months, ensuring comfort and energy savings throughout the year. </p></div>

Q: Why are my air vents sweating?

• <div><p>High humidity is one of the most common reasons for air vents to sweat or produce condensation. When the cool, dry air from your HVAC unit meets warm and moist air in your home, it will cause condensation. Insulating your ductwork can help prevent this. If you live in a very humid region, a dehumidifier can also help.</p></div>

Q: How do I get rid of mold in my furnace?

• <div><p>Before you start removing mold, turn off the furnace. Clean away any visible mold from accessible areas using a mixture of water and mild detergent. Change air filters and check for moisture sources like leaks. If the problem persists or it's widespread, hire a local HVAC company for professional cleaning.</p></div>

Q: How do you keep your air vents working properly?

• <div><p>You can keep your air vents working properly by regularly cleaning them and replacing any air filters as necessary. Your air vents will also work best if you clean and lubricate the exhaust fans and reduce humidity to prevent condensation on them. </p></div>

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Verified Reviews for Air Duct Cleaning pros in Fairfax, MO

*The Angi rating for Air Duct Cleaning companies in Fairfax, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Air Duct Cleaning needs.

*The HomeAdvisor rating for Air Duct Cleaning companies in Fairfax, MO is a rating based on verified reviews from our community of homeowners who have used these pros to meet their Air Duct Cleaning needs.

Last update on December 01, 2025

Reviewed in September 2025
all good. pleased with workmanship and clean up.
Charlie's Tuckpointing and Bricklaying
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Reviewed in January 2023
Joseph was very kind friendly and easy to work with. He took care of absolutely everything we needed and cleaned up after himself. Would 10 out of 10 recommend.
QuickPro Electric
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Reviewed in April 2021
Marion was hired to put in 4 windows, a door and two other things he did not complete. He made it sound so easy, he will take all measurements and put all supplies on hold at **** *****, we pay for and have at house and he’ll do the work. It was a fiasco from the start. Most of the supplies were...
The Property Masters
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Reviewed in July 2019
Very professional and courteous. Excellent work and clean up. Very helpful in answering any questions along the way!
CJS Roofing Co., LLC
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Reviewed in December 2018
They did a very good job. Did exactly what I asked. Great clean up. Prices were great too. Highly recommend.
Tandem Trades LLC
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Reviewed in September 2013
I have used Home systems several times since moving to the area 4 years ago. They are always prompt and have even come the same day when my AC went out and it was 100 deg. He cleaned my furnace and fixed my thermostat. I have a permanent filter and asked about where to get a second one to...
HOME SYSTEMS
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Reviewed in June 2012
Andy came to the house looked over my existing HVAC system and told me he would give me a few options and pricing. A couple days later I was given a personalized book of my options with pricing as well as pricing for the removal of the old equipment. It was very professional and thorough. I...
LAKEBRINK HEATING & AC
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Reviewed in March 2012
They were excellent. They were really reliable. Bob Johnson was the man who owns the company and he knows the furnace and air conditioning stuff. He has been working in this area for a very long time. He has a guy name Bill who works for him and was reliable. He comes as soon as he can. They...
FAIRFAX COMFORT AIR
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Reviewed in July 2005
THIS COMPANY WAS GOING TO TRY TO CLEAN THE SOFA, CHAIR, AND LOVESEAT AFTER A FLOOD. THE WATER HAD ONLY GOTTEN ON THE BOTTOM OF THE ITEMS. BUT HAD STAINED THEM.
PIONEER CARPET & UPHOLSTERY CLEANING
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Find Air duct cleaners in Fairfax

Environmental Testing & Research Laboratories, Inc

4.85(

347

)

Environmental Testing & Research Laboratories, Inc

4.85(

347

)

Customers say: True professional

Recommended by 93% of Angi customers

ETR Laboratories in an analytic laboratory with a broad range of commercial, industrial and individual clients. We provide analytic services using a wide variety of scientific methods including GC/MS, IC/MS, GIR, NMR and SEM equipment. We can do particle analysis, organic and inorganic chemical analysis and micro analysis on biological and other materials. Private water analysis is our specialty. Award winning. Additional DBA - Environmental Testing & Research Laboratories Inc, ETR Labs, ETR Laboratories.

"as advertised"

Nancy C on July 2018

"as advertised"

Nancy C on July 2018

Ductz of West St Louis

4.84(

)

Ductz of West St Louis

4.84(

)

Customers say: Super punctual

Recommended by 94% of Angi customers

We adhere to the National Air Duct Cleaners Association (NADCA) Standards as well as the Environmental Protection Agency (EPA) standards and EPA checklist. My DUCTZ company provides customers with Air Duct Cleaning, HVAC System Cleaning, Dryer Vent Cleaning, and Restoration services in the West St. Louis, Missouri area. Additional phones - (314) 584-0228 Additional email - [email protected]. Additional DBA - DUCTZ International Inc & Ductz Indoor Air Professionals.

"very good, professional, reliable, good quality work, fair price."

bob s on May 2018

"very good, professional, reliable, good quality work, fair price."

Air Duct Cleaning questions, answered by experts

The best time to schedule an air duct leakage test is during the mild spring or fall seasons. During these times, your HVAC system is not under extreme demand for heating or cooling, making it easier to identify and address any issues with the ductwork. Additionally, scheduling the test during these seasons allows you to optimize your HVAC system's efficiency before the more challenging summer or winter months, ensuring comfort and energy savings throughout the year.

High humidity is one of the most common reasons for air vents to sweat or produce condensation. When the cool, dry air from your HVAC unit meets warm and moist air in your home, it will cause condensation. Insulating your ductwork can help prevent this. If you live in a very humid region, a dehumidifier can also help.

Before you start removing mold, turn off the furnace. Clean away any visible mold from accessible areas using a mixture of water and mild detergent. Change air filters and check for moisture sources like leaks. If the problem persists or it's widespread, hire a local HVAC company for professional cleaning.

Figuring out why you have a musty smell in your house is the first step to getting rid of it. Mold or mildew is most likely causing the unpleasant odor. People use these terms interchangeably, but they’re actually different.

Mold is a fungus that loves to grow in moist, humid places. It’s typically black or green and has a raised, uneven texture. Stay vigilant for signs mold may be growing in your home.

You’ll find mildew growing on your shower walls and in your bathroom’s nooks and crannies. It’s a specific type of mold that grows flat. Mildew is usually white, gray, or yellow.

You can keep your air vents working properly by regularly cleaning them and replacing any air filters as necessary. Your air vents will also work best if you clean and lubricate the exhaust fans and reduce humidity to prevent condensation on them.

The Fairfax, MO homeowners’ guide to air duct cleaning services

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