Summer Humidity + Dirty Ducts = Hidden Mold Problems in Your Home
Why Summer Is Prime Time for Air Duct Mold
Have you noticed a musty smell every time your air conditioning kicks on? Or maybe you’ve felt like your allergies are getting worse, even indoors?
It might not just be the summer pollen — the real culprit could be hiding inside your air ducts.
At K.O.S. Cleaning, we understand how frustrating and even scary it can be to think about mold in your home. Many of our customers have told us they had no idea what was circulating through their vents until we showed them what we found during a cleaning or inspection.
Let’s talk about why summer humidity is the perfect storm for mold growth inside your ducts — and what you can do to protect your home and family.
Long Island summers are hot. They’re humid. And while we all rely on our air conditioning to stay cool, most homeowners don’t realize that their HVAC systems can actually create the perfect environment for mold to grow — especially if the ducts haven’t been cleaned in years.
Moisture from the AC system, combined with warm temperatures and dust buildup inside the ductwork, becomes the ideal breeding ground for mold and mildew. Once mold takes hold, it doesn’t just stay hidden. It spreads through your entire home, carried by the air you and your family breathe.
How to Tell If There Might Be Mold in Your Air Ducts
Not all mold is visible. But there are some common warning signs you shouldn’t ignore:
- A persistent musty or damp odor when the AC runs
- Allergy or asthma symptoms that seem worse indoors
- Visible dust or discoloration around vents
- Hot and cold spots in rooms (can indicate blocked airflow or microbial growth)
If you’ve noticed any of these issues, your ductwork could be harboring hidden mold growth — and summer humidity only makes it worse.
What You Can Do (And How We Can Help)
We know this is a sensitive issue. Nobody wants to imagine their home filled with mold, especially when it’s something you can’t even see. That’s why we’re here — not to scare you, but to help you take the first step toward cleaner, safer air.
At K.O.S. Cleaning, we offer IICRC-certified mold inspections of your HVAC system and ductwork. Our experienced technicians can assess whether your system simply needs a professional cleaning — or if air duct mold remediation is necessary.
If remediation is needed, we’ll walk you through the process clearly and honestly — with no hidden fees, no scare tactics, and no pressure.
Real Peace of Mind Starts with a Simple Inspection
If something feels “off” in your home this summer — the air smells weird, your allergies are flaring, or the humidity seems to be making things worse — trust your instincts.
We’re here to help.
Schedule your air duct inspection today with K.O.S. Cleaning. Whether you’re in Nassau County, Suffolk County, or anywhere on Long Island, our team is ready to deliver the most thorough cleaning you’ve ever had — or inspect and treat for mold, if needed.
👉 Call (631) 560-8999 now or request a free estimate online:
Other Services to Consider This Summer
- Dryer vent cleaning – reduce fire risk during peak use
- Window & screen cleaning – improve airflow & light
- Soft washing for siding and roofs – remove algae and organic growth caused by humidity
You Deserve to Breathe Clean Air
Don’t wait until it becomes a bigger problem. Let us help you get ahead of it this summer — and breathe a little easier knowing your ducts are safe, clean, and mold-free.
Your Top Rated Cleaning Specialists
"We guarantee the most thorough cleaning ever, all with zero hidden fees"
Team worked extremely well together and produced the best results throughout our home. All carpets looked new and refreshed. Highly recommended!
KOS Restoration came to clean the ducts at my house after a fire . They were extremely thorough , even went above and beyond by replacing filters in the air ducts that I didn’t even know I had . All the workers were professional... More
KOS Restoration came to clean the ducts at my house after a fire . They were extremely thorough , even went above and beyond by replacing filters in the air ducts that I didn’t even know I had . All the workers were professional and polite , Tom , the owner was amazing. He explained everything in detail and answered every question. I highly recommend this company
Great job done by the entire KOS team! On time, clean, and professional.
Very knowledgeable and great to work with!
Highly recommended Arrived on time: cleaned cedar house and pavers on the property. Big dirty job was done beyond expectations. Brandon was a patient , pleasant guy and Kamil was a pro. Everything looks refreshed for the... More
Highly recommended Arrived on time: cleaned cedar house and pavers on the property. Big dirty job was done beyond expectations. Brandon was a patient , pleasant guy and Kamil was a pro. Everything looks refreshed for the summer . Very happy. I called KOS. 5 stars
On time. Clean. Professional. Thanks
Steve and Brandon did an excellent job! We love the quality at KOS
We cannot recommend KOS highly enough. From the moment they arrived, it was clear we were working with professionals who truly care about their clients. Not only were they polite, thorough, and respectful of our home, but... More
We cannot recommend KOS highly enough. From the moment they arrived, it was clear we were working with professionals who truly care about their clients. Not only were they polite, thorough, and respectful of our home, but they were also the only company to detect additional mold damage that we were completely unaware of, damage that other companies overlooked entirely. Their findings prompted us to call our home inspector back to re-evaluate the situation. What truly stood out was their honesty and compassion. They explained everything in clear, understandable terms and never pressured us into unnecessary services. In an incredibly generous gesture, they loaned us an air purification machine free of charge while we coordinated additional work with another contractor. The team was fast, efficient, and left the space spotless. Every staff member we encountered was pleasant, knowledgeable, and professional. It’s rare to find a company that blends technical expertise with genuine kindness and integrity but KOS does just that. If you're dealing with mold or air quality issues, look no further. This is the team you can trust! Thank you.
Tom and his crew did an incredible job at our home. He was the only one to discover mold in our HVAC system after going through our basement. Our mold situation was taken care of then some. Very thorough and truly treated... More
Tom and his crew did an incredible job at our home. He was the only one to discover mold in our HVAC system after going through our basement. Our mold situation was taken care of then some. Very thorough and truly treated our home as if it was his own.
KOS did an amazing job with the mold remediation at my client's home for a very reasonable price.
I had a sudden leak from the upstairs shower that traveled down to my garage. Erick showed up within the hour! After looking over the damage we went over everything in detail that he found as well as what the process for... More
I had a sudden leak from the upstairs shower that traveled down to my garage. Erick showed up within the hour! After looking over the damage we went over everything in detail that he found as well as what the process for remediation would look like to prevent further moisture and mold. The KOS crew arrived the day of and immediately started working. The office was wonderful in helping with speaking to insurance and helping get payment from them. Couldn’t recommend them highly enough! Thank you KOS RESTORATION!
KOS Cleaning and Restoration came out and did a bid on water damage in my crawl space from a broken water sewer line. Tom came within the hour gave us the most fair bid. The team arrived shortly after to start working. We... More
KOS Cleaning and Restoration came out and did a bid on water damage in my crawl space from a broken water sewer line. Tom came within the hour gave us the most fair bid. The team arrived shortly after to start working. We went with them as they explained in detail the work scope and approximate completion date. Work was done in a professional manner. This included removal of water and muck out. Install fans and humidifier until dry. Installed new vapor barrier. I'm a retired homeowner with 2 properties I know good work when I see it. Workers were knowledgeable and polite. l'd highly recommend this company.
Tom from KOS Restoration was very helpful and kind. I was so scared we had a mold problem in our house after discovering some blackened wood behind our drywall. They picked up the phone promptly and got someone out to look... More
Tom from KOS Restoration was very helpful and kind. I was so scared we had a mold problem in our house after discovering some blackened wood behind our drywall. They picked up the phone promptly and got someone out to look at our issue the same day. The team showed care and concern that we had small children in the house and wanted to solve our problem asap. Extremely impressed and pleased with this company. They went above and beyond what was expected to inspect and remediate mold. Helped us with other issues that we had questions with around our house. Knowledgable, prompt, and kind to work with
Buying a new home is stressful enough but when we found mold in the kitchen it knocked that stress level. We were very lucky to have found KOS Restoration. Tom was open and upfront about the steps that had to completed and... More
Buying a new home is stressful enough but when we found mold in the kitchen it knocked that stress level. We were very lucky to have found KOS Restoration. Tom was open and upfront about the steps that had to completed and their potential costs. Tom was knowledgeable about the why, what and how for the process. The crew was professional through and through. Constantly kept us up to date of what was happening. They were more than tolerant of the numerous questions that was asked. I would highly recommend them to anyone looking for mold remediation work in the area and any families going through this stressful process. Thank you KOS Restoration!
KOS Cleaning and Restoration is everything you could ask for and a family owned business!!! We had some mold issues pop up in our attic on an inspection report during the sale of our home. We had 3 different companies come... More
KOS Cleaning and Restoration is everything you could ask for and a family owned business!!! We had some mold issues pop up in our attic on an inspection report during the sale of our home. We had 3 different companies come out to provide an evaluation for us. We went with KOS and the quote was free, they were right on time and super communicative! Tom personally called me throughout the process and kept me updated every step of the way. They truly make you feel like the most important person to them and as someone who deals with contractors every day, my husband and I can honestly say we were so impressed by their professionalism, attention to detail and quality of work. Thank you again to this amazing company!!
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