Experienced HVAC specialists serving residential and commercial properties

Connecticut’s Trusted Air Duct Cleaning Experts

Improve indoor air quality, remove harmful contaminants, and increase HVAC efficiency with NADCA-certified duct cleaning services. Serving homes and businesses across Connecticut since 1998.

Connecticut’s Trusted Air Duct Cleaning Experts

Improve indoor air quality, remove harmful contaminants, and increase HVAC efficiency with NADCA-certified duct cleaning services. Serving homes and businesses across Connecticut since 1998.

Looking to improve your home’s air quality?

Request a free estimate today and see how our experts can make your air cleaner and safer.

Serving Connecticut Communities

Duct Diagnostics proudly provides professional duct cleaning services throughout Connecticut, including:

Duct Diagnostics proudly provides professional duct cleaning services throughout Connecticut, including:

Serving Connecticut Communities

Duct Diagnostics proudly provides professional duct cleaning services throughout Connecticut, including:

Duct Diagnostics proudly provides professional duct cleaning services throughout Connecticut, including:

Our Duct Cleaning Services

duct-cleaning-icon

Protect your family’s health and improve HVAC efficiency. Our Residential Duct Cleaning removes hidden dust and allergens for a fresher, safer home.

Protect your facility’s air quality and ensure a healthy environment. Our OSHA-certified Commercial Duct Cleaning expertly removes harmful contaminants with strict safety controls.

Protect your property from fire hazards and improve appliance efficiency. Our professional Dryer Vent Cleaning safely clears dangerous lint buildup to restore proper airflow.

Aeroseal Duct Sealing
Aeroseal Technology

Maximize your energy savings and improve overall indoor comfort. Our innovative Aeroseal Duct Sealing safely seals hidden leaks from the inside out for a highly efficient, airtight system.

Certified duct cleaning and sealing experts near me in Connecticut

Comprehensive Duct Cleaning and Sealing Solutions

Our courteous, experienced technicians will do a thorough job while respecting your property. When we finish the job, your home will be as clean as when they arrived. We are known for our integrity and great service at a fair price!

Why Homeowners Choose Duct Diagnostics

  • NADCA Certified Technicians

  • Serving Connecticut Since 1998

  • OSHA-10 Trained Staff

  • Before & After Duct Photography

  • Transparent Pricing

  • Residential & Commercial Services

  • Aeroseal Certified Specialists

  • BBB Accredited Business

Industry-Certified Air Duct Cleaning Professionals

Our technicians follow National Air Duct Cleaners Association (NADCA) standards and use professional-grade equipment to ensure every HVAC cleaning project is completed safely and thoroughly. We document results with before-and-after images and provide honest recommendations based on the condition of your system.

“Low Price” Air Duct Cleaning Scams Videos

Part One

Part Two

Our Promise: Exceeding Expectations, Every Time

Exceeding expectations is more than a slogan—it’s our way of doing business. From the moment we arrive, you’ll notice the difference in how we work. We respect your time, your property, and your trust. Our team takes every precaution to protect your home, explains each step of the process, and provides honest feedback about your system. Many of our customers choose us not only for what we do, but for how we do it—with care, transparency, and a commitment to excellence.

Trusted Connecticut duct cleaning company improving ventilation systems

Accreditations

NADCA certified air system cleaning by Duct Diagnostics CT

Serving Homes and Businesses Alike

Clean air is essential in every setting, whether it’s the place your family gathers or the space where you do business. For homeowners, we create healthier environments by removing contaminants that affect comfort and well-being. For commercial clients, we improve air quality and system efficiency so employees and customers alike can enjoy a safer, more comfortable atmosphere. No matter the size or type of property, our team brings the same dedication and expertise to every job.

Trusted by Connecticut Homeowners and Businesses

25+

Years of Experience

Serving Connecticut Since 1998

200+

5 Star Reviews

Hundreds of 5-Star Reviews

nadca certified

NADCA Certified Professionals

BBB Accredited

BBB Accredited Business

Looking for Duct Cleaning Near You in Connecticut?

If you’re searching for duct cleaning near me, Duct Diagnostics provides professional air duct cleaning services throughout Connecticut. Our NADCA-certified technicians use industry-approved equipment and proven cleaning methods to remove dust, allergens, debris, and contaminants from your HVAC system.

Since 1998, homeowners and businesses across Connecticut have trusted Duct Diagnostics for honest service, transparent pricing, and documented results. We proudly serve Milford, New Haven, Hartford, Fairfield County, and surrounding communities.

Whether you need residential duct cleaning, commercial HVAC cleaning, dryer vent cleaning, or Aeroseal duct sealing, our experienced team is ready to help improve your indoor air quality and HVAC performance.

What Our Customers Are Saying

4.9
S Lindsay
4 days ago
Very quick and efficient estimate for duct cleaning via FaceTime. Eric and Leo were great. Both were super courteous and very efficient. Eric took time to share his thoughts on some issues we pointed out before he started, which he resolved. Very good experience today.
Dora Thagouras
6 days ago
Duct Diagnostics surpassed my expectations! Kevin and Anthony did THE MOST INCREDIBLE JOB cleaning my air ducts! I seriously cannot believe how thorough, efficient and professional they were and their work was outstanding! My house smells fresh and my AC no longer over works and makes loud noises due to over use. I will recommend them every single time! Thank you!!!
Violet D.
1 week ago
Fantastic service thank you !
Joyce Carroll
1 week ago
Cody and Andrew arrived at 8:00AM and went right to work. They were very professional, knowledgeable and efficient. We would strongly recommend Duct Diagnostics as a company that has a highly qualified and well trained staff.
Judith Egan
4 weeks ago
My husband, Paul, called Duct Diagnostics after getting a referral from a friend, and is he glad he did. From the nice office secretary, to the owner, Ralph, (who personally came out to our home for the estimate)to the two technicians who serviced the duct work, Jim and Scott, from"soup to nuts" all was great. Everybody was professional and pleasant to deal with. I highly recommend them!
Jeffrey Andrus
4 weeks ago
Josh and Anthony were a great team! They were thorough, professional, and knowledgeable. They answered all my questions and I could not be more pleased with the results. They deserve every one of their five stars!
nathan MacLean
1 month ago
Jaden, Kevin, and Shirley did an awesome job. The attention to detail and cleanliness was very impressive. I would highly recommend working with them.
John DiBuduo
1 month ago
Work was very clean. Met estimate. Staff was very polite and careful in the home.
Isabel Rathbone
1 month ago
This company was recommended by our Hvac service. The process for getting an estimate and scheduling was very smooth. The technicians were professional and very pleasant. They were careful to leave the house clean and to share what they found. No upselling or pressure. I would totally use them again.
Andy P
1 month ago
Dan, Eric, Anthony and Mark were fantastic. Excellent level of service and value!

Air Duct Cleaning FAQs

The cost of professional duct cleaning in Connecticut depends on factors such as the size of your home, the number of HVAC systems, ductwork layout, and the level of contamination. Duct Diagnostics provides a detailed inspection and a customized estimate before any work begins, so you know exactly what to expect.

Most homes benefit from professional air duct cleaning every 3–5 years. However, more frequent cleaning may be recommended if you’ve recently completed a renovation, have pets, allergy sufferers in the home, visible dust buildup, mold concerns, or reduced HVAC performance.

Yes. Professional duct cleaning can improve indoor air quality, remove accumulated dust and allergens, improve HVAC efficiency, and help extend the life of your heating and cooling system. When performed by trained professionals using industry-approved methods, it is a worthwhile investment in your home’s comfort and HVAC performance.

Yes; however there is only one way to properly clean ducts, called source removal. Source removal is a mechanical cleaning process used to remove dust, dirt, mold and debris from your system. Source removal is considered the only acceptable method for cleaning and decontaminating air duct systems and requires three elements: mechanical agitation, which loosens the dust and dirt from the walls of your HVAC system components; extraction, which removes this debris from your air ducts; and environmental controls, which involves us putting your duct system under suction with a HEPA filtered vacuum so no additional debris goes airborne. The result of this method is the safe removal of dust and contaminants from your HVAC system to levels that comply with our industry’s standards.

When choosing a duct cleaning company, look for:

  • NADCA Certification: Choose a contractor with certified Air Systems Cleaning Specialists (ASCS) who follow NADCA cleaning standards.
  • Experience: Select a company with an established track record. Duct Diagnostics has been serving Connecticut since 1998.
  • Customer Reviews: Read verified customer reviews to evaluate professionalism, quality of work, and customer satisfaction.
  • Proper Equipment: Make sure the company uses professional-grade HVAC cleaning equipment designed to thoroughly clean ducts while protecting your system. Duct Diagnostics uses certified equipment and industry-approved cleaning methods.

Aeroseal Duct Sealing FAQs

Sealing the ducts within a structure will save energy, increase the comfort and ventilation levels, and, in some cases, comply with building codes. Sealing the air ducts will also reduce chances of any cross-contamination that may occur between different building zones.

The Aeroseal sealant we use is very safe. There is currently no exposure limit set for vinyl acetate polymer (VAP), which is one of the main ingredients of our sealant material, and the other main ingredients have all been reported nontoxic based on years of research. After sealing, the vast majority of what is left in the duct system is VAP (vinyl acetate polymer), which has been used in water-based paints, adhesives, and hair spray. VAP has been used in chewing gum and has no OSHA exposure limit.

There may be a mild odor for 30 minutes after we leave, but once dry, the material is odorless throughout its lifespan.

The effectiveness of Aeroseal is guaranteed for 10 years and has been tested up to 40 years. The sealant comes with a 10-year warranty and a certificate that verifies the completion of the process.

We highly recommend that the ducts be cleaned beforehand. The process will change the airflow in the ducts, and even if there is light debris, it may become airborne when the system is turned back on.

Unlike other sealing methods, Aeroseal can seal ducts that are hidden. Aeroseal can seal all types of ducts.

Residential & Commercial

Breathe Cleaner. Live Better.
Let’s Get Started.

Ready to experience the difference of professional duct cleaning? Duct Diagnostics is proud to serve Milford and communities across Connecticut with trusted expertise and proven results. If you’re looking for cleaner air, improved efficiency, and service you can rely on, now is the time to act. Contact us today to schedule your appointment and take the first step toward a healthier home or business.