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Ductwork directly affects the performance of the heating and cooling system. Leaks at the seams, holes, contaminant buildup, and any imperfection that restricts or allows air to escape is a problem. Higher energy bills, increased impact on the environment, greater strain on components, inferior comfort, and concerns with indoor air quality are a few of the common consequences.

Ductwork Expertise from Welzig Heating and Air

Welzig Heating and Air is the key to optimizing ductwork operation. We offer proactive maintenance and responsive repairs for all styles of residential duct systems. We combine experience and a full inventory of specialized tools with our commitment to higher standards of workmanship. Rest assured, we don’t skip steps, overlook details or leave anything to chance. Our team of professionals handle every job to satisfaction guaranteed.

Duct Repair and Maintenance

Reach out to Welzig Heating and Air at (720) 336-3777 for comprehensive ductwork testing, inspection, and service in Boulder, CO and surrounding areas. We provide honest evaluation, concise recommendations, and cost-effective solutions. We focus on results that hold up to wear and tear. Our in-house sheet metal fabrication shop readies us for anything, avoids delays, and ensures the perfect design, fit, and installation. Maximize the potential of your HVAC system with duct repair and maintenance from Welzig Heating and Air, anywhere across Boulder, Longmont, Louisville, and Lafayette, CO.

Satisfied Customers
They Speak For Us

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.


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.


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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