Professional Duct Repair in Longmont, CO

How much attention do you give your ductwork? Are you sure the duct system is operating at its best? Have you considered that your monthly expenses, level of comfort, indoor air quality and the longevity of your heating and cooling units are directly affected by the ducts? Any compromise in performance, from leaks to a buildup of debris within the pipes, is a far-reaching problem.

Welzig Heating and Air specializes in duct repair and maintenance. We offer a complete suite of residential and commercial ductwork services in Longmont, including accurate testing, evaluations and recommendations. Our NATE-certified technicians handle all types of concerns and are equipped with the advanced tools and technology to achieve effective solutions without damage or disruption.

Your Duct Repair and Maintenance Team at Welzig Heating and Air

Over 1994 years of HVAC services, we at Welzig Heating and Air have found that complaints with indoor temperature, odors, cold spots, energy costs, asthma attacks and aggravated allergy symptoms can often be blamed on the ductwork. The ducts transport hot and cold air throughout the home and can spread dust, mold, mildew and all sorts of harmful toxins. They can harbor mice, rats, ants, fleas and an alarming assortment of pests. Don’t wait to have your ductwork thoroughly checked out. Investing in proactive measures from Welzig Heating and Air pays unmatched rewards.

Duct Maintenance & Duct Repair Boulder, CO, Longmont, CO & Louisville, CO

Duct Maintenance & Duct Repair

Duct MaintenanceDuct Repair

Satisfied Customers
They Speak For Us

Dave Kaplan-Gomez and James Miltersen installed my new Tankless Water Heater. Both were polite and professional. Care was taken not to damage anything in my house which I really appreciated. I use Welzig for all my HVAC needs and highly recommend them.


Bob came out to look at our swamp cooler and was remarkably helpful and professional. Not only did he give me a knowledgeable diagnosis, but he also taught me a lot in the process. We’ll be calling him for all future needs with our cooling system.


Our 23-year-old A/C system ran out of “borrowed time” and became too difficult to continue maintaining. With great advice from Casey Welzig,, we replaced the old system with a Bryant Evolution A/C system. Max Loustaunau and Seth Bernhardt did an excellent job with removing the old system and installing the new one. Both of them are great to work with — very professional and very personable. We are really amazed at how much better the new system works!

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Longmont, CO