Duct Sealing

Leaky ducts are a common problem in Longmont, Boulder, Loveland and surrounding areas, affecting both residential and commercial properties. According to the Environmental Protection Agency, up to 30% of the air that passes through the ducts in the average household is sacrificed to leaks. Along with problems with air velocity and pressure, flaws in the ductwork compromises efficiency and forces the heating and cooling system to run more frequently, longer, and work harder. Unnecessary repairs, premature replacement of the system, and higher costs are a few of the consequences.

Expert Duct Sealing Services

Established in 1997, DNI Heating, Cooling, Refrigeration, & Plumbing, Inc. upholds a reputation for honorable and quality services across Longmont, Boulder, and Loveland Colorado. Our fully licensed, trained, and insured professionals provide cost-effective and proven duct sealing services. Extensive experience, resources, and state-of-the-art technology ensure optimum results and sustainability.

Contact us for duct sealing services

At completion, we perform pressure testing to verify that the ducts are perfectly balanced. Locally owned and operated, DNI Heating, Cooling, Refrigeration, & Plumbing, Inc. is your trusted source for a full range of duct services across Longmont, Boulder, and Loveland Colorado.

What our clients are saying

R. Larson

Extremely happy with my decision to use DNI. Installed cash price of my new furnace & AC unit was about 23% lower than the competition. Chris was very knowledgeable, conscientious, and top notch! The whole crew was excellent!

R. Barcklow

DNI and Chris specifically were amazing. My furnace went out with the first Colorado storm and they were able to come out the next day and provided me with honest, transparent service so I could make the best decision for my budget. There was never any pressure from Chris between buying a new furnace and fixing my old one. I felt like they were patient and willing to work with me and my needs. I would highly recommend DNI for heating services.

J. Jacobs

The service personnel were top-notch – friendly, professional, and dealt with some unexpected issues without missing a beat! Plus, they were dog lovers and made friends with my best buddy Highly recommended!

K. Kitten

Trustworthy, fair and will advocate for their clients. Whether it is maintenance or replacement DNI is wonderful. As a small business, the options are limited and expensive for replacing a unit that is original to the building. Chris L. worked exceptionally hard to ensure that our needs were met, ultimately finding the most cost effective solution.

M. Southworth

DNI Heating got out to my house, assessed the problem and installed a new furnace for us within hours on a Friday afternoon. We did not have to worry about the 0 degree temperatures coming in that weekend. The service was great from the minute I called to helping us register our furnace.

D. Johnson

This crew has saved me on multiple occasions. From heating to ac service they have done it all for me. Always great customer service and a quick response time! Thanks for the continued great service DNI!

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Save today with our special offers

At DNI Heating, Cooling, Refrigeration, & Plumbing, Inc. our goal is to make your residential or commercial property more comfortable, and to help you save money. We are happy to provide you with the following special offers!

Special Offers


Local Residential Service Call


This coupon cannot be combined with any other offers. Coupons must be mentioned when booking service calls.

Expiration: 9/30/24