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Duct Diagnostics cleans air ducts and dryer vents, and carries a 4.9-star Google rating across 301 ratings. The company says it has been in business 28 years. A recent customer who had just moved in said two techs spent about 6 hours cleaning each zone, along with the dryer vent. An HVAC contractor wrote recently that the company performed a duct blast leakage test for town approval on an A/C-heat pump system and ductwork installation. A recent customer said they also found faults that were causing circulation issues and repaired them. A recent customer said the crew put down drop cloths, covered furniture near the work area, wore booties and showed before and after photos of the ducts. A recent customer said they charged exactly what they quoted. A 2024 customer from Danbury, CT wrote that the company is not the lowest cost option, and said a two-man crew spent a full eight hours cleaning every supply and return vent. A 2023 customer said they found multiple holes where the system was losing pressure and patched them. A 2022 customer who woke up to soot in the house wrote that Ralph and his crew provided an estimate and got all the cleaning done within 24 hours. Connecticut lists its home improvement contractor registration, HIC.0671165, as active, held by Duct Diagnostics LLC.
“Duct Diagnostics”
Our service from start to finish was fabulous! We have just moved in and knew the home had never been cleaned. The two techs were so conscientious and spent about 6 hours cleaning each zone, along with the Dryer vent. Great work, pleasant company to work with from start to finish.
Professional, courteous and neat. Dan and Anthony were terrific.
Lou and Anthony were Amazing - so helpful, very informative and professional! Left my house smelling good and clean!
Absolutely the best. As an HVAC contractor I needed a duct blast leakage test done for town approval on an A/C-Heat pump system and ductwork installation. They came highly recommended through trade contacts. Great communication and scheduling. Test was performed by an experienced trade professional without bias or confrontation. I have had my customers use Duct Diag. for duct cleaning and they were just as happy. 100% recommend this company.
⭐️⭐️⭐️⭐️⭐️ Absolutely Amazing! We are beyond impressed with Duct Diagnostics, LLC in Middletown, CT! Eric and Leo came to our home on time and did an absolutely amazing job. They were professional, knowledgeable, thorough, and truly took pride in their work. Unfortunately, last week we hired another company to clean our vents and it was a terrible experience. They left our home dirty, did not do a good job, and, even worse, they used the wrong tool and actually ripped one of our instalation Then we called Duct Diagnostics, LLC, and what a difference! Eric and Leo came prepared with the right tools and equipment and took their time to properly inspect and clean everything. They covered our furniture before work and did an incredible job and left everything clean and professionally done. We are so impressed with this company. This is honestly one of the best companies we have ever worked with. As you can see from the photo Before & After. I highly, highly recommend Duct Diagnostics, LLC! If you want the job done right, this is the company to call! ⭐️⭐️⭐️⭐️⭐️
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1 change recorded — last scanned Oct 13, 2026.
Driveway crack sealing4.7
Countertop measured, installed and cleaned up3.9
Loose steps, porch board and railings secured3.9
Roof done on time and on budget3.3
