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Welzig always offers FREE estimates on your equipment replacement

Higher quality equipment and installation procedures result in greater satisfaction in your investment into winter temperature control.  At Welzig Heating and Air, we epitomize higher standards in every stage of your installation project.  Family owned, we recognize the often disastrous consequences of inferior products, and refuse to compromise our exacting levels of reliability, durability, and efficiency of the heating systems we recommend.  If you’re looking for sustainable solutions that will enhance the convenience, comfort, and health of your home or office, Welzig Heating and Air is the right choice to handle your project.  We further protect the interests of our residential and commercial customers across Boulder, CO and surrounding areas with precision sizing and system design, prompt scheduling, and coordinated project management.

Efficient Heating Installation Service

As a Bryant Factory Authorized Dealer, we offer a great number of options that live up to your exacting criteria and fulfill any demand.  We’ll not only solve the specific requirements of your indoor space and lifestyle, but improve the way you manage your temperature control.  Advanced features such as Perfect Heat technology and precise gas modulation, achieve up to 98.3% AFUE, by adjusting system operation to the changing demands within the home.

For a heating installation done right, look no further than Welzig Heating and Air!

Our factory trained, NATE-certified technicians draw from practical experience and in-depth product knowledge to customize solutions and serve your long-term goals.  To facilitate your investment into a superior heating system, we offer special financing with approved credit.  Since first opening our doors in 1994, Welzig Heating and Air has continued to elevate the quality of comfort across Boulder, Longmont, Louisville, and Lafayette, CO.

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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