Air Duct Repair, Sealing & Replacement

Air Duct Repair, Sealing, and Replacement Services

Northwest Crawl Space Services offers a comprehensive range of air duct repair, sealing, and replacement solutions designed to optimize the performance and efficiency of your HVAC system. Our experienced technicians utilize advanced techniques and high-quality materials to address a variety of air duct issues and ensure long-lasting results

Call Us

(888) 246-5837

Get Your Free Quote

Fill out this form and we will contact you within 24 hours.

Benefits of Air Duct Repair, Sealing, and Replacement

At Northwest Crawl Space Services, we understand the vital role that properly functioning air ducts play in maintaining a comfortable and healthy indoor environment. Our comprehensive air duct repair, sealing, and replacement services offer numerous benefits for homeowners, including

Improved Indoor Air Quality

By sealing leaks and removing contaminants such as dust, pollen, mold, and bacteria from your air ducts, our services help to enhance indoor air quality. This can alleviate allergy symptoms, respiratory issues, and other health concerns, promoting a healthier living environment for you and your family.

Leaky or poorly insulated air ducts can lead to significant energy losses, resulting in higher utility bills. Our professional repair and sealing techniques help to minimize air leaks and optimize airflow, reducing energy consumption and improving HVAC system efficiency. This can lead to noticeable savings on your heating and cooling costs over time.

Properly sealed and insulated air ducts ensure that conditioned air is distributed evenly throughout your home, eliminating hot or cold spots and providing consistent comfort in every room. Say goodbye to temperature fluctuations and hello to a more comfortable living space year-round.

By addressing issues such as air leaks, excessive strain on your HVAC system is reduced, leading to less wear and tear over time. Our professional repair and maintenance services can help extend the lifespan of your heating and cooling equipment, delaying the need for costly replacements and repairs.

A well-maintained HVAC system operates more efficiently, consuming less energy and reducing greenhouse gas emissions. By investing in air duct repair, sealing, and replacement services, you’re not only improving comfort and indoor air quality but also contributing to a more sustainable future for our planet.

With our expert technicians handling your air duct repair needs, you can rest easy knowing that the job will be done right the first time. We stand behind the quality of our workmanship and materials, providing you with peace of mind and confidence in the long-term performance of your HVAC system.

Our Services

Air Duct Inspection

We start by conducting a thorough inspection of your air duct system to identify any leaks, damage, or other issues affecting its performance. Our detailed assessment allows us to develop a customized repair plan tailored to your specific needs.

Air Duct Repair

Our skilled technicians are equipped to repair a wide range of air duct problems, including leaks, cracks, loose connections, and damaged ductwork. We use industry-leading techniques and materials to restore your ducts to optimal condition and prevent energy loss.

Air Duct Sealing

Proper sealing of air ducts is essential for preventing air leaks and improving energy efficiency. We utilize professional-grade sealants and insulation materials to seal duct joints, seams, and other vulnerable areas, ensuring that conditioned air remains inside your home where it belongs.

Air Duct Replacement

In cases where air duct damage is extensive or repair is no longer feasible, we offer comprehensive air duct replacement services. Our team will carefully remove old, inefficient ductwork and install new, properly sized ducts to optimize airflow and maximize system performance.

Insulation Installation

Insulating your air ducts is crucial for preventing heat loss or gain and maintaining consistent indoor temperatures. We specialize in the installation of high-quality insulation materials to improve energy efficiency and reduce heating and cooling costs.

Customized Solutions

We understand that every air duct system is unique, which is why we offer customized solutions tailored to your specific needs and budget. Whether you require minor repairs, comprehensive sealing, or full duct replacement, we'll work with you to find the best solution for your home.

Common Types of Air Ducts

Before addressing any issues with your air duct system, it’s essential to understand the different types of air ducts commonly found in residential HVAC systems

Flexible Air Duct(supply/return)

This type of duct consists of a flexible tube made of round wire coil, wrapped with fiberglass insulation, and covered with polymer plastic. It comes pre-insulated and ready to install as one piece, offering flexibility in routing through tight spaces.

Hard supply air ducts are primarily constructed of aluminum. Unlike flexible ducts, these rigid tubes require manual insulation after installation. They offer durability and longevity, especially in areas with higher air pressure requirements.

The main trunk serves as the primary air distribution pipe, connecting directly to the furnace or air handler. It distributes air to supply ducts that feed registers throughout the house. Main trunk ducts are typically larger in diameter than supply ducts and are commonly made of metal, although flexible options are also available.

Dryer vent ducts are solid 4-inch rigid pipes that extend from the dryer through crawl spaces or attics to exhaust heat and moisture outside the house. Proper installation and maintenance of dryer vent ducts are crucial for fire safety and efficient dryer operation.

These ducts are dedicated to venting air from bathroom and kitchen exhaust fans to the outside of the house. They typically consist of rigid or flexible ducting material and help remove excess moisture, odors, and airborne contaminants from these areas, improving indoor air quality and preventing mold and mildew growth.

Common Issues with Air Ducts

Leaky Ducts

Leaks in air ducts are a common problem that can result in significant energy loss. These leaks allow conditioned air to escape into unconditioned spaces such as attics or crawl spaces, leading to higher energy bills and reduced comfort levels.

Mold and Mildew Growth

Moisture buildup within air ducts can create an ideal environment for mold and mildew growth. Not only can this impact indoor air quality, but it can also pose health risks to you and your family, especially for those with respiratory issues or allergies.

Energy Inefficiency

Inefficient air ducts can lead to wasted energy and increased utility costs. When ducts are poorly insulated or improperly sealed, conditioned air may not reach its intended destination, resulting in overworking of the HVAC system to maintain desired temperatures.


Northwest Crawl Space Services is family-owned right here in the Pacific Northwest. With years of experience, we’re licensed and bonded and always prioritize our customer’s satisfaction. Please read some of our 5-star reviews from our happy customers.

Myong Soo Kim
Myong Soo Kim
9 March 2023
Exceed their promises..excellent communication and great crew. Highly recommend.
Thomas Roberts
Thomas Roberts
9 March 2023
Rob and crew from NW Crawl Space did full remediation for our crawl space and attic, after finding evidence of rodents (mice) in both areas. Removed old crawl space insulation & vapor barrier, replaced heat-ducts that were damaged, & vacuumed out attic insulation and debris. Sealed openings in both areas to prevent rodents from returning. Traps set, with rodent control plan. Highly recommended!
Emily Davis
Emily Davis
3 March 2023
Northwest Crawl Space Services has been honest, professional, easy to work with, and has done excellent work on my home. I first approached the company looking for someone to reinsulate and clean out my mud room crawlspace-- it is an addition to the house and is open-air. Lior came by and noted that because NWCSS specializes in fiberglass insulation, they wouldn't be able to work on this part of my house, because it would require spray foam insulation to truly be rat and weather proofed. I really appreciated this up front honesty-- two previous contractors had given me bids to reinsulate with fiberglass, never mentioning the need for spray foam, and never saying that they wouldn't be able to do a proper job. I would have paid money to some other company for a shoddy, inappropriate "solution" if Lior had not filled me in. Lior even recommended some other companies to call that specialize in spray foam! After this helpful and informative experience, I knew right away when I discovered signs of rats in my main basement crawlspace that I wanted NWCSS to be the ones to work on the problem. Lior came by to check it out and did a very thorough inspection. His manner with clients is excellent-- I never felt like my questions were being dismissed. We set a date for a crew to come by to replace rat-infested insulation, remove the improperly installed vapor barrier, clean out debris, and reinstall vapor barrier to industry standards. The crew, Patrick and Chandler, were friendly, polite, and happy to answer questions. Savannah in the office has also been very friendly and quick to answer my questions regarding logistics and payment. Overall, my experience was excellent and I will re-hire NWCSS when it comes time to reinsulate and clean out my attic crawlspace.
jan ostrovsky
jan ostrovsky
6 February 2023
Matan gave us a fair estimate for the crawl space re-insulation and screening, and the work was done promptly. I was pleasantly surprised when the final bill came in about 15% UNDER the estimate. It’s nice to deal with a company which has the integrity to pass those savings on.
Dan Huang
Dan Huang
26 January 2023
Northwest Crawl Space is a trustful company to work with. They helped me install the French drain, replace the insulation and vapor barrier. Matan and his stuff did a great job. They will carefully protect your home when performing the job, clean the waste after the work is done, and come back to inspect if the work is good.
Scott Taylor
Scott Taylor
17 December 2022
We had Northwest crawlspace come out to inspect our crawlspace and they identify a lot of standing water as well as rodent activity in the insulation. As a result, we needed a full clean out of our crawlspace and new insulation, vapor barrier, drain and sump pump. The crew was professional, friendly and fast. The work was extremely well done, we recently had them come out to check everything and the technician confirmed it was one of the best installs he had seen. I would highly recommend this company to anyone.
Ricardo Salvatierra
Ricardo Salvatierra
16 December 2022
My experience with this company has been amazing. Lior (the owner) goes above and beyon every single aspect, super professional and always providing the best advice to avoid unnecessary expenses. They did the whole work in my crawlspace, sump pump, french drain, vapor barrier, etc... and results are great, 0 moisture. I would definitely recommend it.
Torrey Olsen
Torrey Olsen
15 December 2022
Lior and his NW Crawl Space Services team were everything we expected in professionals! They were on time, neat, though, communicative, polite, did the job as promised and then checked back with us as promised again to ensure that the job was done!
Wayne Appler
Wayne Appler
18 November 2022
I had Northwest Crawl Space Services remove all my rodent infested insulation and vapor barrier. They cleaned & disinfected my crawl and installed all new insulation and a sealed vapor barrier. The workers were very diligent and and skilled in their methods. I was given a quote up front and feel that I received a quality job that was worth every penny. I am beyond pleased with the company and would highly recommend them to everyone.

Frequently asked questions

How do I know if my air ducts need repair or replacement?

Look out for signs such as inconsistent room temperatures, increased energy bills, strange odors, visible mold growth, or excessive dust around vents. Our professional technicians can conduct a thorough inspection to assess the condition of your air ducts and recommend the appropriate repairs or replacements.

Repairing or sealing your air ducts can improve indoor air quality, enhance HVAC system efficiency, and reduce energy costs. By addressing leaks, gaps, and other issues, you can prevent air loss and ensure that conditioned air reaches all areas of your home, resulting in a more comfortable and healthier living environment.

The duration of the air duct repair process depends on various factors, including the extent of the damage, the size of your HVAC system, and the complexity of the repairs needed. Our experienced technicians will assess your specific situation and provide an estimate of the timeline during the initial consultation.

Yes, we stand behind the quality of our workmanship and materials. Our air duct repair services are backed by a 10 years warranty to provide you with peace of mind. Please contact us for more information about our warranty coverage and terms.

Get Your Free Quote

Fill out this form and we will contact you within 24 hours.