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Serving Longmont and the Greater Boulder Area Since 1994
By combining immediate results with sustainable performance, we protect the value of your investment.
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Maintenance Plans
Top-Quality HVAC Service

As a Bryant Factory Authorized Dealer, Welzig Heating and Air consistently performs to strenuous standards of technical competence, business ethics, and customer approval.  Our team is NATE-certified, factory trained, and regularly updated in progressive technology.  Equipped with leading-edge equipment, tools, and a full inventory of genuine manufacturer’s replacement parts, we properly size and install new systems, accurately diagnose existing systems, and resolve the majority of issues right then and there.

Circle of Champions
Bryant Factory Authorized Dealer

Welzig Heating and Air has become an award winner of Bryant’s Circle of Champions for the THIRD YEAR IN A ROW. To join the Circle of Champions, Bryant Factory Authorized Dealers must grow their Bryant-branded product sales, high-efficiency and air quality equipment sales, and provide superb customer service. They must also participate in dealer programs and promotions. Only 2% of all Bryant dealers ever make the cut and we are so proud to be one of them! Keeping client satisfaction as the focus of our services is our highest priority and we can’t wait to show you how.

Let’s Work Together

AC MaintenanceAir Conditioner InstallationFurnace RepairHeating ServiceAir Conditioning Repair ∴ Lafayette, CO ∴ Louisville, CO ∴ Boulder, CO

Servicing and installing the latest Bryant products

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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