CALL/TEXT TO BOOK TODAY (720) 336-3777

Longmont’s Premier Sheet Metal Fabrication Contractor

For efficient heating and cooling in your home or business, few things are more important than custom sheet metal fabrication services. When a system is custom made for your space it will work more efficiently, and look more appealing. Not all HVAC companies offer sheet metal fabrication services, so when the time comes for ductwork replacement, or new construction, contact the experts at Welzig Heating and Air.

Welzig Heating and Air has been serving Boulder, Longmont, Louisville, and Lafayette, CO since 1994 with a full range of HVAC services, including sheet metal fabrication. This is one of the ways we provide the best possible heating, cooling, and ductwork systems for our clients. We also offer ductwork sealing, cleaning, repair, and replacement. When it comes to the health, efficiency, and longevity of your air ducts and vents, you can count on us.

Your Custom Ductwork Made Simple with Welzig Heating and Air!

Welzig Heating and Air is a Bryant Factory Authorized dealer, with nearly thirty years of experience with the homes and business of Boulder, Longmont, Louisville, and Lafayette, CO. We are NATE certified for technician excellence, accredited and in good standing with the Better Business Bureau, and a Google Guaranteed Service Provider. What really matters is our reputation in the community for fast, professional service done with a smile. Contact us today to find out more about our sheet metal fabrication services.

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.


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!


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.

Leave Us a Review!
Google Reviews
Angies List Reviews
Yelp Reviews
Facebook Reviews
Contact Us Now For A
Free Estimate