Spending a fortune on summer cooling is just part of living in the valley, but a massive chunk of that crisp air escapes before ever reaching your living room. For instance, leaky joints in unconditioned attics force your air conditioning to work double-time. 

So, finding the best duct sealing companies in Phoenix helps you track down these hidden gaps, lowering your power bills and cutting down on dust. 

To help you save cash and stay comfortable, we tracked down the top local options. Read on for companies you can trust!

Sealing Method	Average Cost Range
Manual Mastic and Mesh Sealing	$900 – $1,200
Advanced Aeroseal Polymer Injection	$1,500 – $2,500

1. Knights of the Attic

Website: https://www.knightsoftheattic.com/

Address: 2610 E Mohawk Ln, Ste 112

Contact: (833) 620-7396

Hours: Monday to Friday: 6:00 AM – 6:00 PM

Fixing hidden airflow issues and structural flaws in your attic is the smartest way to achieve lasting, measurable comfort in your home. 

The crew at Knights of the Attic actually stands out for using advanced thermal imaging and comprehensive diagnostics to target the root causes of energy loss, rather than just masking the symptoms. 

They focus on professional air pressure leakage repairs, such as crushed or leaking lines, to restore proper balance to your system, all while keeping your living space immaculate throughout the project.

We recently spoke with a homeowner in Scottsdale who praised the team for working incredibly cleanly while sealing up their old, leaky system. 

Beyond their meticulous site management, the business offers performance packages that guarantee every room in your house will stay within ±3 degrees of your thermostat setting, year-round. 

It’s worth noting, however, that this specific comfort guarantee isn’t included if you opt for their entry-level Bronze package.

Definitely recommend

I dont usually write reviews, but I had such a great experience with this company that I had to say something. My sales guy, Cody was a pro. Totally opened my eyes to obvious (in retrospect) inefficiencies in my house. They came fixed up my ducts and airflow immediately improved. Wish I would have done this the day I moved in. Definitely recommend these guys.

Spencer Smith | Google Review

Very grateful

10/10 business. Can’t believe how much these guys can help out. It’s actually ridiculous how bad duct work is in AZ. Better air quality. Even temps throughout the house, lower bills especially in the hottest months. Very grateful for this company.

Garner Gietz | Google Review

2. F & M Services

Website: https://ventcleaningarizona.com/

Address: 21630 N 19th Ave Suite B-9

Contact: (480) 580-7831

Hours: Monday to Saturday: 8:00 AM – 8:00 PM

F & M Services uses modern cleaning tools and sanitizing solutions to restore full ventilation functionality. Improving your breathing environment is made easier with their focused approach to indoor air quality. 

They bring over a decade of hands-on local experience to protect homes from accumulated pollutants and accidental lint fire hazards. 

Plus, their technicians are highly versatile, offering additional maintenance tasks such as ceiling fan and kitchen exhaust cleaning to keep your property running smoothly. 

But you should keep in mind that their operational scope is strictly limited to sanitization and automated Aeroseal polymer applications. 

If you run into severe structural issues requiring heavy-metal duct reconstruction or complex mechanical system overhauls, you’ll need to look elsewhere. Those particular tasks fall completely outside their immediate daily capabilities.

Highly recommend

Francisco came and cleaned our dryer vent and sealed it up in the attic space. He was on-time and got right to work. He ran his brush, with camera attached, all the way up to the roof. Cleaned up everything and went up to seal the vent in attic near roof. Also took care of a leak in my cooktop exhaust vent inside cabinet above the fan. Very quick! Loved the pictures he took and will help with future home inspection when I sell! Great job! Highly recommend!

Steve DeYoung | Google Review

Fair and honest prices

Francisco and his team are amazing! On time, courteous and professional. Highly recommend if you’re wanting to get your ductwork and/or dryer vent cleaned. Fair and honest prices; will definitely be calling them again and referring everyone I know 🙂

Trishalynn86 Schmidt | Google Review

3. Thermo S Insulation

Website: https://thermosinsulation.com/

Address: 7509 E Southern Ave Ste 104, Mesa

Contact: (480) 261-1382

Hours: Monday to Friday: 8:00 AM – 4:00 PM

The team at Thermo S Insulation drives home efficiency by pairing technical duct repairs with thorough diagnostic evaluations, allowing them to pinpoint exactly where your cooling escapes. 

Beyond sealing, their technicians install airtight can light covers and use licensed contractors to boost attic insulation to an R-49 rating.

Clients frequently praise their office manager for ensuring every detail aligns with local building standards. 

When a colleague had his property evaluated last spring, he praised the team for making the process feel as comprehensive as a full-scale home inspection. 

Just keep in mind that because their business model centers on holistic energy audits, standalone sealing requests typically require undergoing their full evaluation process first.

Amazing job

They did an amazing job.  Our house has stayed a cool 78° all day. We haven’t had that happen since we moved in. They performed the inspection and sealed the duct work within a few days, and helped improve the comfort of our home. Thank you!

Wendi Lathe | Google Review

Definitely recommend

They did a great job from the initial estimate to completion of the job. The sealed our ducts and added insulation to our attic.  They were on time, the employees were courteous and cleaned up when finished.  I would definitely recommend this company.

Lynn Kulas | Google Review

4. Arizona Chimney & Air Ducts

Website: https://www.arizonachimneysweep.com/

Address: 610 E Bell Rd #2-126

Contact: (602) 483-6541

Hours: Monday to Saturday: 8:00 AM to 7:00 PM

Securing your ventilation lines without causing mechanical damage requires a delicate touch and years of local expertise, and this is where Arizona Chimney & Air Ducts excels.

For starters, this team combines over 35 years of family-owned experience with a rock-solid satisfaction guarantee. 

We appreciate how they use specialized negative-pressure systems that contain dust during cleaning to protect your home’s delicate interior components.

They even have a commitment to avoiding harsh chemical sprays, opting instead for safe, physical cleaning methods alongside clear, upfront pricing with no hidden fees.

A minor operational trade-off to keep in mind, however is the scheduling.

Because the crew divides their time between complex fireplace masonry repairs and standard ventilation care, scheduling a rapid turnaround during peak summer heat waves may require a little extra coordination.

Very thorough and most professional

Very happy with my service from Arizona Chimney and Duct. Becky was very helpful to get me scheduled and Danny was right on time, very thorough and most professional. I will be using them again when needed and will share their contact w friends and family.

Ari Pontikas | Google Review

Highly recommend

Absolutely stellar service from Becky and Levi at Arizona Chimney & Air Ducts! From start to finish, Levi was professional, on time, and extremely courteous. He took the time to thoroughly explain the process and ensure everything was done right. It’s clear that this company cares about its customers, and Levi went above and beyond to make sure I was satisfied. Highly recommend them for anyone in need of chimney or air duct services. Top-notch experience all around!

Lori Patrick | Google Review

5. Champion Air

Website: https://www.championair.com/service-areas/phoenix-az

Address: 2025 W Rose Garden Ln

Contact: (480) 748-4000

Hours: 24 Hours

The technicians at Champion Air deliver comprehensive climate setups designed for extreme valley conditions, utilizing in-depth camera inspections to detect hidden cracks early. 

We appreciate that their field crew consists entirely of NATE-certified professionals. They even offer a structured maintenance plan to guarantee priority response times during summer emergencies.

Overall, they’re an excellent choice for older mid-century homes that require targeted joint reinforcement. 

While they stand out among HVAC providers in Phoenix for their sheer scale, they’re also a full-service operation. 

In particular, since duct sealing is just one segment of their business, you won’t get a boutique team focused exclusively on ventilation lines.

Grateful

Victor is so professional and he is kind and very knowledgeable and able to answer, demonstrate and provide a wonderful peace of mind in all that he does for Champion Air and for us!

Thank you for having him be our technician!!!

Linda Chen | Google Review

Extremely happy

We have used Champion Air for many years.  We have been extremely happy with their service and technicians.

Joshua was here in just a few minutes after we called because he was in the area.  Had to get part from Trane before they closed at 4 PM and still finished in less than 2 hours.  Great service.

Muffet Deisher | Google Review