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.

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Our Duct Cleaning Services

Residential Duct Cleaning

Commercial Duct Cleaning

Dryer Vent Cleaning

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.

Accreditations

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

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

Bob & Donna P.

“Thank you for being so neat and clean. We will certainly recommend your service to others.”

Sohail G

“Thanks again for your honest appraisal of my home duct status. I was impressed by your firm’s integrity and will share this experience with my colleagues in real estate.”

Zdenka F.

“This is to thank you for recommending Duct Diagnostics to come and look at the air conditioning ducts at my house after the recent water damage and re-construction.

Michael Keller came to do the inspection and found the ducts in good order, with no special cleaning necessary. The service was performed at no charge to me and I want to thank you for recommending them. They are obviously a very honest outfit.”

Carolyn P.

“Your technicians were extremely professional and well informed! It was a pleasure doing business with Duct Diagnostics!!”

Neena N.

“Duct Diagnostics cleaned the ducts in our home. They were efficient and professional and did a wonderful job.”

Donna W.

“I am overjoyed with the work done this week by your team. I now have a completely different experience of being in my home. Whereas before I would truly dread certain areas of our home, now the air in each and every room is clean.

For 18 months I have been scratching and sneezing in my own room – essentially dreading the nights. I now love to be in my room, I sleep through the night, and I feel healthier. Your method is far more effective than my allergy medicine!

Your team was extremely professional and careful in our home. I think that they left the house cleaner than when they arrived through their efforts to be meticulous. The knowledge of the men on your team was quite impressive. I trusted them with the heart of our home, and they had the skill and precision to execute a very intricate procedure.

Our heating system too has become far more efficient through your method of cleaning the ducts, adjusting the dampers and checking the direction of the grates. Rooms that were freezing cold now are warm. I shudder to think about how much money we previously had wasted.

For someone such as myself with severe allergies, the ability to breathe fresh clean air is totally uplifting to body and spirit. Your team did such a great job, that I would be thrilled to recommend your service to anyone. This is the greatest thing that has ever happened to me.” – Lisa M.

“Thank your for sending wonderful and professional men. They did a wonderful job!”

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.
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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.