
DUCT Sealing
Lock in the benefits of your duct cleaning with proper sealing







When I called to raise this, they denied any responsibility and offered excuses for why their air-hose method wouldn't have caught it — while refusing to remove it now except as a new, separately paid job. Whatever the brush's origin, their original service demonstrably failed to clear the duct.
I agreed to pay again anyway, just to get it resolved. I was told a manager would call me first to discuss it. No one called. I waited for the scheduled technician instead; no one showed. When I followed up, I learned the office had canceled the appointment without telling me.
I rescheduled a third time, and to avoid any confusion, I emailed a photo of the brush along with the access details (about 10 feet in, no crawlspace) and asked them to confirm they could do the job at the agreed price. The email went unanswered. When I called, I was assured the office had seen it, reviewed the photo, and confirmed the job and price.
Two weeks later, the technicians arrived — 90 minutes early, before I was ready — with no idea they were there to remove a stuck brush. After using about 15 minutes of my time, they concluded they couldn't remove it after all. I told them to leave and hired someone else.
Across three separate appointments and every point of contact — the initial cleaning a year ago, the manager callback, the scheduled visit, the confirmed job — Capitol Duct Cleaning did not follow through on a single commitment it made. I won't use them again.



In general, every person I've talked to or had out has been kind, courteous, knowledgable and really stepped up. For example, my air return wasn't installed quite right (tract homes), and the tech went and reworked the sheet metal and fixed a problem that was not even theirs. Just free of charge, just pride in work stuff.
Then we all learned that the builder didn't tighten the wires into the control board, so the cleaning vibrated it out and my heat pump went offline. Same time, a burning dust smell in a bathroom kind of lingered (builder left vents open/running during construction.) This time, the head dude himself comes out, they hook it all up, re-clean the entire system for good measure, and my price? Zero. They just did it.
I'll say too, I'm not an HVAC guy but I've worked around construction enough to know when people care, and I'm telling you, these guys are the people you want working on your house.






First, the good: Both Dominick and Quentin, the techs, were great. Very polite and thorough. And Adam, the owner, was very nice and quickly addressed my concerns when the work I expected wasn't done during the first visit.
Now, the not-great: I initially called for professional dryer vent cleaning when I saw lint build-up beyond my lint filter and couldn't reach it with my vacuum. But I quickly learned from the first tech that cleaning from the dryer's lint filter to the wall isn't included in their service. For an industry whose entire existence is based on the threat of dryer lint building up and causing a fire, it's weird to me that this business only addresses PART of the threat. When I spoke with the owner about this, to his credit, he eventually agreed to send a second tech out to provide that service at no extra charge.
The other bad is not that it took 4 business days to get this resolved, as I think that's a pretty reasonable timeframe. No, it's the fact that I've received 3 texts and 1 email since the 1st visit begging for a review. I don't need to be hounded daily (esp before the work is complete) to provide a review. And I don't need to be told that the techs' bonuses depend on getting a five-star review.
In the end, the work was performed well and the price seemed reasonable. But the bumps along the way were annoying.










I highly recommend Capitol Duct Cleaning, especially if you’re lucky enough to get Larry and Q. Outstanding service from start to finish!






I highly recommend this company!

We confidently refer our clients to Capitol Duct knowing they’ll receive exceptional service every time. Whether residential or commercial, we highly recommend reaching out to their team.




I also want to thank the front desk team, especially Amy and her co-worker. Because of my kids’ school event, they went out of their way to accommodate my schedule. I can’t thank them enough for their flexibility and kindness.
Overall, I’m extremely satisfied with the service. Highly recommended!







The team came out to clean our ductwork and dryer vent, and they did a thorough, professional job from start to finish. They were polite, genuinely friendly, and took the time to explain every step of the process, answering all our questions with patience. They also sanitized the system and gave helpful, non-pushy recommendations for maintaining clean indoor air. We immediately noticed a difference in air quality. Highly recommend!


Improves overall air quality
Provides consistent temperatures
Increases home efficiency and saves money
Be in the Top 5%
Did you know, according to the U.S. Department of Energy, 95% of homes have leaky ductwork?
Capitol Duct Cleaning uses advanced duct sealing technology to locate and seal leaks throughout your system. Quickly, cleanly, and thoroughly. The goal? Stop air from escaping and help your system run the way it should.
Boost Your Indoor Air Quality
By Sealing Your Ductwork The Right Way

Many things affect the air you breathe indoors, like where you live, your HVAC filters, and even the season. But one of the biggest factors is your ductwork. Air ducts run through less-than-ideal parts of your home, like attics, crawlspaces, and inside of walls. If those ducts aren’t sealed, they can pull in dust, insulation, and other unwanted particles, circulating them through your living space.
Leaks in your air ducts can let in more than just air. When your ductwork has gaps, especially in areas like crawlspaces or attics, it can draw in dust, odors, allergens, and other pollutants from places you don’t want circulating through your home.
This can be especially tough for people with asthma, allergies, or other sensitivities. Unsealed return ducts can also bring in excess humidity, leading to moisture problems and making it harder to keep your home comfortable.

Improve your HVAC system, elevate your air quality, & breathe easier.
Reviews







When I called to raise this, they denied any responsibility and offered excuses for why their air-hose method wouldn't have caught it — while refusing to remove it now except as a new, separately paid job. Whatever the brush's origin, their original service demonstrably failed to clear the duct.
I agreed to pay again anyway, just to get it resolved. I was told a manager would call me first to discuss it. No one called. I waited for the scheduled technician instead; no one showed. When I followed up, I learned the office had canceled the appointment without telling me.
I rescheduled a third time, and to avoid any confusion, I emailed a photo of the brush along with the access details (about 10 feet in, no crawlspace) and asked them to confirm they could do the job at the agreed price. The email went unanswered. When I called, I was assured the office had seen it, reviewed the photo, and confirmed the job and price.
Two weeks later, the technicians arrived — 90 minutes early, before I was ready — with no idea they were there to remove a stuck brush. After using about 15 minutes of my time, they concluded they couldn't remove it after all. I told them to leave and hired someone else.
Across three separate appointments and every point of contact — the initial cleaning a year ago, the manager callback, the scheduled visit, the confirmed job — Capitol Duct Cleaning did not follow through on a single commitment it made. I won't use them again.



In general, every person I've talked to or had out has been kind, courteous, knowledgable and really stepped up. For example, my air return wasn't installed quite right (tract homes), and the tech went and reworked the sheet metal and fixed a problem that was not even theirs. Just free of charge, just pride in work stuff.
Then we all learned that the builder didn't tighten the wires into the control board, so the cleaning vibrated it out and my heat pump went offline. Same time, a burning dust smell in a bathroom kind of lingered (builder left vents open/running during construction.) This time, the head dude himself comes out, they hook it all up, re-clean the entire system for good measure, and my price? Zero. They just did it.
I'll say too, I'm not an HVAC guy but I've worked around construction enough to know when people care, and I'm telling you, these guys are the people you want working on your house.






First, the good: Both Dominick and Quentin, the techs, were great. Very polite and thorough. And Adam, the owner, was very nice and quickly addressed my concerns when the work I expected wasn't done during the first visit.
Now, the not-great: I initially called for professional dryer vent cleaning when I saw lint build-up beyond my lint filter and couldn't reach it with my vacuum. But I quickly learned from the first tech that cleaning from the dryer's lint filter to the wall isn't included in their service. For an industry whose entire existence is based on the threat of dryer lint building up and causing a fire, it's weird to me that this business only addresses PART of the threat. When I spoke with the owner about this, to his credit, he eventually agreed to send a second tech out to provide that service at no extra charge.
The other bad is not that it took 4 business days to get this resolved, as I think that's a pretty reasonable timeframe. No, it's the fact that I've received 3 texts and 1 email since the 1st visit begging for a review. I don't need to be hounded daily (esp before the work is complete) to provide a review. And I don't need to be told that the techs' bonuses depend on getting a five-star review.
In the end, the work was performed well and the price seemed reasonable. But the bumps along the way were annoying.










I highly recommend Capitol Duct Cleaning, especially if you’re lucky enough to get Larry and Q. Outstanding service from start to finish!






I highly recommend this company!

We confidently refer our clients to Capitol Duct knowing they’ll receive exceptional service every time. Whether residential or commercial, we highly recommend reaching out to their team.




I also want to thank the front desk team, especially Amy and her co-worker. Because of my kids’ school event, they went out of their way to accommodate my schedule. I can’t thank them enough for their flexibility and kindness.
Overall, I’m extremely satisfied with the service. Highly recommended!







The team came out to clean our ductwork and dryer vent, and they did a thorough, professional job from start to finish. They were polite, genuinely friendly, and took the time to explain every step of the process, answering all our questions with patience. They also sanitized the system and gave helpful, non-pushy recommendations for maintaining clean indoor air. We immediately noticed a difference in air quality. Highly recommend!





The Aeroseal Process
The Aeroseal duct sealing process is done in three easy steps!

First, we’ll isolate your air ducts. This is done by using foam plugs to block off the entrances from the AC and the furnace, ensuring that the only way air can escape is through gaps and leaks in your vents.
After the ducts are isolated, we attach the Aeroseal duct sealing system to your ductwork and run a pretest. The pretest provides us with a benchmark or baseline of sorts that we can use to measure the success of the duct sealing work.


The next step is where the magic happens! Air duct leaks are located and then sealed with the Aeroseal duct sealing technology. Any gaps or leaks throughout the entire ductwork are sealed quickly and safely from the inside with the help of the small adhesive particles. Throughout this process, everything is monitored by a duct-sealing technician in real-time from a computer screen.
Finally, you, the homeowners, are presented with a certificate verifying and proving that the air ducts were properly sealed. Now, you’ll enjoy the results instantly with lower energy costs, balanced heating and cooling throughout the home, and more!


After duct cleaning, choose a contractor who will finish the job.
Seal the deal after you clean
Contact Us
Phone: 360-352-4693Open Hours
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FAQ
- What is air duct sealing?
- Why should I consider sealing my ducts?
- How can I tell if my ducts are leaking?
- How is duct sealing done? What methods do professionals use?
What is air duct sealing?
Duct sealing is the process of closing leaks, gaps, or cracks in your home’s HVAC ductwork to prevent air from escaping. Approximately 95% of homes, according to the U.S. Department of Energy, have some degree of leaky ductwork.
Why should I consider sealing my ducts?
Sealing leaky ducts offers several benefits: energy savings, better comfort, and improved air quality. Leaky ducts can cause significant loss of heated or cooled air, which forces your HVAC system to work harder, leading to higher utility bills.
How can I tell if my ducts are leaking?
Look for these signs of leaky ducts:
- Higher-than-normal energy bills – If your heating or cooling costs rise unexpectedly without a change in usage, you might be losing air (and money) through leaks.
- Uneven heating or cooling – Certain rooms remain cold in winter or hot in summer, indicating that conditioned air isn’t reaching those areas. Leaks often result in rooms, especially those farther from the furnace, being difficult to keep comfortable.
How is duct sealing done? What methods do professionals use?
One method used by many contractors in Western Washington is the Aeroseal process. Technicians block off your vents with foam plugs and connect an Aeroseal machine to the duct system. They then inject microscopic adhesive particles into the airflow. These particles cling to the edges of holes or gaps, gradually sealing the leaks from the inside.


