Smart Tips for Cleaner, Healthier Ducts

Proper duct cleaning is about more than just removing dust. It’s about using proven methods, certified equipment, and a professional touch that leaves your system healthier and more efficient. At Duct Diagnostics, we believe in doing things the right way—thoroughly, safely, and honestly. We never rely on gimmicks, and we always show you real results with clear explanations. The difference is simple: when your ducts are cleaned properly, you breathe easier and live better.

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.

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Our Duct Cleaning Services

Duct Diagnostics - Residential air duct specialists improving home ventilation and comfort
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Residential Duct Cleaning

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

Commercial HVAC cleaning professionals servicing Connecticut businesses

Commercial Duct Cleaning

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.

Dryer vent cleaning by Duct Diagnostics

Dryer Vent Cleaning

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

Aeroseal Duct Sealing

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!

“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

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

What Our Customers Are Saying

4.9
Zorba Lieberman
1 week ago
Dan and Anthony came to the house to do the job. They were very neat and conscientious as they did their work. They shared before and after photos, which were very helpful. Very happy with this group.
Matthew Geula
1 week ago
Great experience from first phone call all the way through to the final day of the job. Rob was able to provide an estimate based on the FaceTime walkthrough we did of the entire house - including the attic and basement. He was knowledgeable, thorough, open and forthcoming every step of the way. We scheduled the job for a few months out bc of the crazy winter we had and when I had to reschedule at the last minute bc of a travel conflict DD was more than accommodating. The crew was punctual, if not early, clean and respectful. Kevin and Andrew were excellent and efficient. Both extremely knowledgeable and easy to work with. Highly recommend.
Raymond Kuruc
3 weeks ago
Very efficient and thorough. They did an excellent job.
David Pressler
3 weeks ago
Eric and John were very courteous and helpful. They did the work in a timely fashion. We would certainly use them in the future!
Robert Falkowski
3 weeks ago
Dan and Anthony were FABULOUS! Explained everything they were doing in great detail. Left the house cleaner than it was before they arrived! Great company to work with from first phone call to job completion. Wish all companies could be so great to work with! THANK YOU!!!
Anupam Tantri
4 weeks ago
We had not had our air ducts cleaned at all. My HVAC company recommended Duct Diagnostics. And I am mighty glad they did. The three-person team of Duct Diagnostics, led by Eric did a fantastic job. They came in at 7:30 am and left around 4 pm. They did a thorough job and cleaned up the work areas before they left. I would highly recommend Duct Diagnostics for your duct cleaning needs.
Olivia O'Brien
4 weeks ago
Duct Diagnostics did an amazing job cleaning our HVAC! We recently bought a home and could tell the ducts needed major work. Actually, when the team came to evaluate our system, they said it looked like the HVAC had never been cleaned since the house was built in 1993. Josh and Gibson were extremely professional, personable, and transparent with costs and services. They showed detailed pictures at the start and end, always confirmed with us before starting an unexpected part of the cleaning, and kept our house spotless throughout. The entire cleaning was done in 4 hours - well ahead of schedule without compromising the quality. We will absolutely be booking with this company in the future and will be recommending to others in need of their service!
Susan May
1 month 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
1 month 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
2 months ago
Andrew, Kevin’s,Dan, and Taryl did a fantastic job. I will be using them again. Highly recommend. Thank you.

Air Duct Cleaning FAQs

Frequency of cleaning depends on several factors, not the least of which is the preference of the homeowner.

Households with pets should also consider cleaning their air ducts more frequently to remove excessive hair and dander that can build up and negatively affect the air quality for those in the home who may have asthma or allergies.

Some of the other things that may lead a home owner to consider more frequent cleaning include: water contamination or damage to the home or HVAC system, residents with allergies or asthma who might benefit from a reduction in the amount of indoor air pollutants in the home’s HVAC system, after home renovations or remodeling, and prior to occupancy of a new home. We offer a free inspection of your ducts to determine whether or not your system needs to be cleaned.

Heating, ventilation, and air conditioning (HVAC) systems have been shown to act as a collection source for a variety of contaminants that have the potential to affect health, such as mold, fungi, bacteria, and very small particles of dust. The removal of such contaminants from the HVAC system and home should be considered as the other important component in an overall plan to improve indoor air quality.

A four bedroom, 2,500 sq. foot colonial style house with ducts in the basement and attic should take two men approximately 8 hours.

Duct Diagnostics’ professionals will inspect your particular system and provide a firm proposal prior to performing any work. Every system varies based on linear footage of ducts, as well as the level of contamination within the ducts.

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.

Ask yourself the following questions when selecting a potential contractor for your air duct cleaning job:

  • Is this company a current member of the National Air Duct Cleaners Association (NADCA)? Are they in good standing with this organization?
  • What is the business’ background? How long have they been in business?
  • What experience do they have working in this area? Have they worked with homes or businesses similar to mine?
  • What do customers say about their services?
  • Does this business hold the right NADCA certifications to perform HVAC system cleaning?
  • What equipment will they use to perform the job?

Aside from answering these questions, make sure that your potential air duct cleaning contractor visits your home to perform an HVAC system inspection before the job and provides you with a proposal for the job. Finally, it is critical that the company visually inspect all of the air ducts and related system components because any remaining debris or contaminants in the ducts after being serviced could lead to future damages and health issues in your home.

NADCA (National Air Ducts Cleaner Association) is a non-profit association of businesses that offer air duct cleaning services. As an organization, NADCA represents qualified companies that engage in the inspection, cleaning and restoration of air ducts and HVAC systems of homes and businesses. By supporting its members with proper education, certification and advocacy, the NADCA aims to make their association members the best providers of HVAC inspection, cleaning and restoration services, and air duct cleaning for consumers.

As a NADCA member, we signed a Code of Ethics to protect the consumer and follow all NADCA Standards for cleaning to the best of our ability.

Duct Diagnostics also had to meet many requirements to join NADCA. We have certified Air System Cleaning Specialists (ASCS) on staff that have taken and passed the NADCA Certification Examination, validating their comprehensive understanding of HVAC design and efficient cleaning methodologies. Our company’s ASCSs are also required to attend seminars to further their education of the HVAC cleaning industry, which also allows our business to maintain our NADCA certification status as well as remain up-to-date on the most efficient processes. These extensive education requirements and certifications ensure that all NADCA members, like Duct Diagnostics, provide the most reliable air duct cleaning services to our clients.

NO. While performing our duct cleaning services, your air ducts are under tremendous negative pressure and all contaminants are contained within a HEPA Filtered negative air machine.

Please watch our 4 minute video featured on the front page of this site. You will see our techs having the customers literally look into the ducts to verify the cleanliness.

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.