We Serve All of Connecticut!

Since 1998, Duct Diagnostics has offered residential and commercial Aeroseal duct sealing, duct cleaning, and dryer vent cleaning services to customers all over Connecticut. Our knowledge of the area and our professional experience has enabled us to develop long lasting relationships with homeowners and well known organizations, including Shelton High School and the entire Naugatuck School system. Although we are headquartered in Milford, CT, our team of certified air systems cleaning specialists provides services to cities and towns across the entire state of Connecticut. For a free inspection of your home or business, please contact us through our online form, or call us at (203) 734-1532.

Service Areas
Certified duct cleaning and sealing experts near me in Connecticut

Breathe Cleaner, Live Healthier: Why Choose Us for Your Air Duct Cleaning

At Duct Diagnostics, we go beyond just cleaning your air ducts — we help you create a healthier home. Our certified technicians use industry-leading equipment to remove dust, allergens, mold, and contaminants from your ductwork, improving indoor air quality and HVAC efficiency. With over two decades of trusted experience, hospital-grade sanitization tools, and a commitment to customer satisfaction, we ensure your family breathes easier. Choose us for reliable service, transparent pricing, and results you can feel.

Residential & Commercial

We Serve All of Connecticut

Although we are headquartered in Milford, CT, our team of certified air systems cleaning specialists provides services to cities and towns across the entire state of Connecticut. For a free inspection of your home or business, please contact us through our online form, or call us at (203) 734-1532.

Ready to Breathe Easier? Call Us Today!

Don’t wait until poor air quality affects your comfort and health—let our experts at Duct Diagnostics handle your air duct cleaning needs. Whether it’s your home or business, our team is just one call away from providing cleaner, safer air. Reach out now to schedule your service or get a free estimate. We’re here to answer your questions and deliver the quality you deserve. Clean air starts with a simple call—contact us today!

Certified duct cleaning and sealing experts near me in Connecticut

What Our Customers Are Saying

4.9
Susan May
4 days ago
Loved these guys. Very friendly. Hard workers . Even came early😁. I recommended you to my neighbor in 18 Salem walk, she inquired after seeing your van. Thanks!
Charles Greer
2 weeks ago
Duct Diagnostics did an excellent job on cleaning the furance and all the duct work. There were 6 people here in the morning and 3 in the afternoon that did a great job of removing the direct and cleaning our system. Thank you and your team very much and look forward to using Duct Diagnostics again.
john dephillips
3 weeks ago
Andrew, Kevin’s,Dan, and Taryl did a fantastic job. I will be using them again. Highly recommend. Thank you.
Stan McD
4 weeks ago
I'm very pleased with Duct Diagnostics. The 3 gentlemen who came out to clean our ductwork (while we're in the middle of a renovation) were professional, courteous and did a fantastic job. They explained every procedure and explained how we can continue maintaining our system safely and effectively. They have my highest recommendation.
Tara Bennett
1 month ago
Vincent & Ryan were incredible!! Service was immaculate & thoroughly completed!! Great experience! Highly recommend
Ann Kelly
2 months ago
The owner is professional and easy to work with. The technicians Dan and John were also professional, competent and friendly.
Spencer Bird
2 months ago
We just had our ducts cleaned today and I couldn’t be more impressed with the entire experience. From start to finish, the team was professional, punctual, and extremely thorough.

They took the time to explain exactly what they were doing, showed us before-and-after photos, and made sure every vent, return, and the main trunk lines were cleaned properly. You could immediately tell they take pride in their work. They were also incredibly respectful of our home — wearing shoe covers, protecting floors, and cleaning up completely before they left.

The difference in air quality is noticeable already. As new homeowners, it gives us real peace of mind knowing the system is clean and running efficiently.

If you’re considering duct cleaning, don’t hesitate. This team was honest, efficient, and worth every penny. Five stars all the way!
Jenna Filakovsky
2 months ago
The team was courteous and professional. They arrived on time and described what needed to be done at our house. They put drop cloths over surfaces where they would working to keep our space clean. Once finished they reviewed their findings. I would certainly use them again and would recommend to anyone. Thanks team!
Jeff Adamson
2 months ago
I called Duck Diagnostics today for an issue I thought I had with my ducts. Tim Called me right back within minutes of my call to them and spent about 15 minutes on the phone with me walking me through the percieved problem. It turns out I had no issues at all with the ductwork. Tim didn't try to make me book an appointment, he just helped me realize that all was fine with my ductwork. I highly recommend Duck Diagnostics!
Parviz Kermani
3 months ago
The crew, Bobby and John, did a meticulously thorough and clean job. Both were most courteous and pleasant individuals. It really showed they knew what they were doing.
The company, Duct Diagnostic , LLC, was highly recommended by our AC company and we’re are very pleased with the outcome.

They are expensive, but worth it.
Highly recommended.

Accreditations

Nadcacert
BBB accredited business
BNI
CHCC
Energy Star
CRM
Indoor Air Quality
Nadca