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Longmont, CO Professional Duct Sealing Services

Temperature variations, humidity fluctuations and vibrations caused by air circulation adds up to wear and tear on ductwork. Seals gradually deteriorate, duct material corrodes, joints separate and there’s the potential for pests and contaminants to find their way inside. Any flaws result in significant energy losses and higher utility bills. You may notice uneven heating/cooling, difficulty achieving comfort, excessive dust and unpleasant odors.

Welzig Heating and Air highly recommends scheduling inspection, testing and troubleshooting for your ductwork. With the severe year-round weather conditions in Longmont, Colorado, taking good care of the entirety of the HVAC system is especially important. We bring 30 years of proven expertise, honesty and reliability to the job. Our NATE-certified technicians provide straightforward explanations, recommendations and solutions. We handle effective duct sealing.

Duct Sealing Made Simple with Welzig Heating and Air

Duct sealing from Welzig Heating and Air can help to keep your living or working environment healthier, cleaner, more comfortable and efficient. By fixing holes, cracks and gaps, we stop pollutants from entering and getting distributed throughout the breathing air. By making sure conditioned air arrives at the intended destination, we can save an average of 20% on energy bills and extend HVAC system longevity. Trained in best duct sealing practices, we maximize benefits.

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.


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!


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.

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