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Duct Maintenance Made Simple!

The air you breathe, pay for and rely on for comfort just about year round circulates through the ductwork multiple times per day. If airflow is diminished by a buildup of debris, restricted by design issues, picks up contaminants or leaks out through holes or gaps, you’ve got big problems. The hygiene, health and comfort of the home are directly influenced by the integrity of the ventilation system. The efficiency, reliability and longevity of heating and cooling equipment are significantly impacted by the ducts. It only makes sense to take good care of them.

Because the ducts are largely concealed inside walls and crawl spaces, they’re easy to forget about. However, neglected ducts will gradually make their presence known in higher utility bills, odd sounds, unpleasant odors, excessive dust, hot and cold spots and an uncomfortable living environment. With 30 years on the job, Welzig Heating and Air is well-versed and totally prepared for all types of ductwork problems. We provide skilled repairs as well as maintenance in Boulder, Colorado.

Duct Service Experts, Welzig Heating and Air

Let our NATE-certified professionals make sure this essential network of pipes operates at peak capacity. Our team has the training, experience and specialized tools to accurately evaluate the system, resolve concerns and prevent issues without damage. Duct inspection, testing, cleaning, sealing and a complete range of repairs and upkeep are handled with expertise. If you live in Boulder and want to improve the performance of your HVAC system, give Welzig Heating and Air a ring at (720) 336-3777.

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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