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Mold in the Airconditioner Ducts – 4 Signs to Watch Out For

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A mold infestation usually comes with health symptoms that are similar to respiratory allergies.

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At Thomas Hoffmann Air Conditioning & Heating, we pride ourselves in being a locally owned and operated HVAC company. With more than 30 years of experience and a master technician and mechanical engineer as our owner, we can replace, repair, and provide maintenance for your business or home’s HVAC system.

Of all the problems you might have with your air conditioning, mold in the duct system can be dangerous for your health and not so easy to get rid of. This problem develops over time and is not easy to identify before it gets too bad.

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The service man came out as requested. I called at night and he was here at 8:AM.He figured out the problem and had it fixed within the hour.Very courteous and efficient.JGold
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Our furnace decided to stop working at 11pm on a Friday right before a bad winter storm. They took my call that night and had a tech (Duraid) out by 9am the next day and had us all fixed up within 15 minutes! Fantastic customer service. Thank you!!
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Thomas Hoffmann always does a great job in servicing our HVAC. Installed a new system last and it’s working great and very efficient. Nick goes above and beyond when servicing and answers all my questions. Highly recommend Thomas Hoffmann Air conditioning & Heating.
Response from the owner: Thank you, Nancy, for your kind words! We're glad to hear that you're satisfied with your new system and appreciate Nick's dedication to great service. Your recommendation means a lot to us!
They were professional and got my hot water back on. And I'm happy about that.
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Had a water pump leak and they were out the very next day to repair!
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Great service and was very prompt. Service person was courteous
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Called at 5:50 on a Friday hoping to get an appt for next week. Guy on the line listened to my problem, diagnosed the problem over facetime, and gave me instructions as to how to change the filter on my unit with no problem at all. Fixed the problem and I didn't even have to pay a cent for it! I'll definitely be coming back here when we run into ore substantial maintenance problems.
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Awesome job! Nick was great. Prices are reasonable and well explained what I’m paying for and what work needs to be done.
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Always professional, always on time and good value for the work that they do!
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As always, the Hoffmann technician was polite, professional, and efficient. Pricing is reasonable and even more importantly, they are dependable. I will continue to use Thomas Hoffman A/C and Heating.
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My neighbor referred these guys to me when had water heater problem. Previous company told me I needed to replace it. Tom’s technician fixed it for less than $200. This was over 2 years ago and have been using their service ever since. They are very trustworthy.
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Nick Hoffman was amazing! He came out same day when our heat suddenly went out. He took the time to describe the problem and expertly fixed and tested it! Will definitely be recommending them. Thanks.
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Job well done. The technician was competent and polite and knowledgeable. We'll have him back in the spring, honest company.
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Realized my furnace stopped working late last night and forecast called for very cold arctic air blast. Called my regular HVAC company that advertises 24 hour service to find that after 7 PM, there is only an answering service. Same with two more “24 hour service” companies. Then I called Thomas Hoffmann HVAC Company and Nick quickly answered, listened to my issue, gave me a quote and was on his way. Nick arrived soon, completely checked out my furnace, found the problem and did the repair. Because the problem was fairly minor, he even gave me an unexpected and very appreciated discount. Nick was professional, competent, and very engaging. Best emergency, after-hours experience I’ve ever had. Nick saved the day and gave me the peace of mind I needed.
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Nick was great he was prompt and very patient in explaining the problems with our system and the steps we would take to solve them.I highly recommend using Thomas Hoffman Air Conditioning and Heating!
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Nick was friendly, professional and knowledgeable, he did an awesome job!!
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Furnace would not blow heat on Friday night and after leaving a few messages to several companies, Mr Hoffman called me back quickly and did a service call. Diagnosed the issue and was able to fix the problem. Will need a new unit soon, but nice not be without heat during the holidays! Quote and Invoice receipt done on the spot and detailed! Will use again for sure.
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Excellent! Highly recommended
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Thomas he was prompt and was great getting us up and running. He was awesome
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I was referred via home advisors. And I was so worried about the cost and the distance but Nick came and found my problem and fixed my problem and if I could I would shout-out to the world this is a honest and good company to hire. As a landlord over the road of 5 homes. I can call this company and trust that they will do the job and be honest. And I will not have to pay extra fees or be given a 3 week appointment Just because it's rental property. This is my go to company and I strongly recommend this company.
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Called Thomas Hoffmann HVAC and received service very quickly. Regular winter maintenance was provided. They always do a great job.Really appreciate their service and would recommend to anyone in kirkwood!
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Punctual / friendly / great service !!Highly recommend!
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Having Nick come to our aid was a great experience and he offered followup assistance with the fancy technology part of the appliance if we need it. We will call him again if the need arises. Merry Christmas.
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These guys are pros.Techs are friendly, listen and explain what they are doing.Office staff is responsive.Fast service....
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Nick was a true expert in explaining our options for a new thermostat.
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My AC unit was located on the ground in a very undesirable area; in the direct path of my neighbor’s downspout. Sent pics to Thomas, got a reasonable estimate to raise the unit off the ground and bolt it to my foundation. The work was completed cleanly and efficiently at a very reasonable price! Extremely satisfied with their work!
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Notified me of expected arrival time and then again when he was on his way and was exactly on time! Nick was very personable and trustworthy.
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Thomas Hoffmann AC & Heating was wonderful to work with. They arrived on time, diagnosed the issue and got the work done fast. I would recommend Thomas Hoffmann AC & Heating to anyone.
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Tom and his team helped us select a great 2nd unit for our first floor. Installation went smoothly and it looks great. Cheers!
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Arrived early in the time window quoted. Zach is a thorough tech and discovered an issue I had suspected. Able to quickly get the part and fix the issue. Great company to work with. The communication before the appointment is outstanding. Highly recommended.
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Excellent Service. Thank you Zackery
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I'm a new customer and had my first appointment for furnace check.My tech was Zack and what a professional. He explained how he checked system and answered all my questions. This was a very good experience
Response from the owner: Thank you, Patricia, for your kind words! We're glad to hear that Zack provided you with a professional and informative experience during your furnace check. Your satisfaction means a lot to us!
Thomas Hoffman was so helpful. They even helped me set up my nest thermostat.
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Service was on time and did a quality service of my two systems.
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Excellent customer service. Reasonably priced. My go-to for any HVAC needs.
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Here are four signs to look out for when regularly evaluating your air conditioning system. They will help you identify a mold problem early and solve it before it damages your health, home, or HVAC system.

Strange Smell in the House

The first sign usually noticed during a mold infestation is a strange, musky smell in the house, especially when the AC is on. The smell might be felt in the whole house or only in adjacent rooms that may get less sunlight or lack proper air circulation. The smell is similar to mildew smell, and you might become used to it over time. Ask someone who is visiting you if they notice a moldy smell when they enter your home. If you suspect something, call a professional AC service and have them check the inside of the vents.

Mold Spots or Black Dust around the Duct Openings

If you start noticing mold spots and mold dust, your problem already got much bigger. Usually, the infestation is quite advanced if you actually see the mold at the duct openings, ceilings, or walls. Mold looks differently, depending on the species infesting your house. It can look like a white, fluffy deposit or green-blue spots. Black mold, one of the most dangerous kinds, looks like black dust covering your duct grids, and you might mistake it for regular dust.

Allergy-like Symptoms

A mold infestation usually comes with health symptoms that are similar to respiratory allergies. You will get a runny nose, watery eyes, coughing, and sneezing, etc. If these symptoms disappear as soon as you leave the house or you stop using the air conditioner, it’s a sign that you might deal with mold.

Headaches, Breathing Problems

Some of the worst symptoms you can get from mold growing in your air conditioning system are headaches, dizziness, breathing problems, and other more serious signs. For people with certain conditions, such as asthma, these respiratory problems can be exacerbated and degenerate in an emergency.

If you notice one or more of these signs, seriously consider a mold infestation and investigate further. Calling an AC service is the best way to deal with such a problem because DIY solutions may not be safe or as effective as specialists. In addition, if you want to prevent such problems, then it would be wise to schedule maintenance visits at least once a year.

Thomas Hoffmann Air Conditioning & Heating

Thomas Hoffmann Air Conditioning & Heating specializes in installing, repairing, and maintaining the cooling system for your home. We are dedicated to keeping our customers cool in the hot summer months by selling the best air conditioners on the market, providing preventative maintenance services, and sending out our certified technicians to service your existing equipment.

24/7 Service Call Now

At Thomas Hoffmann Air Conditioning & Heating, we pride ourselves in being a locally owned and operated HVAC company. With more than 30 years of experience and a master technician and mechanical engineer as our owner, we can replace, repair, and provide maintenance for your business or home’s HVAC system.

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