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Welzig always offers FREE estimates on your equipment replacement

The quality of your summer depends largely on the performance of your cooling system.  At Welzig Heating and Air we combine premier equipment with skilled installation to achieve greater comfort, efficiency and reliability.  There is no room for compromise.  We recommend only those products that live up to our exacting criteria in order to achieve superior and sustainable results. Family owned, we serve the long-term satisfaction of our residential and commercial customers across Boulder, CO and surrounding areas.  Take advantage of our special financing with approved credit, and realize your goals for a refreshingly cool, healthy, and enjoyable indoor environment.

Let the experts handle your AC installation!

Welzig Heating and Air qualifies as a Bryant Factory Authorized Dealer by performing to exceptional levels of business practices, customer approval ratings and technical proficiency.  Our team is NATE-certified, factory trained, and current with evolving industry advancements.  We bring you a selection of innovative cooling options that include features such Evolution Connex control for optimal dehumidification capability, five stages of variable-speed operation, zoned conditioning, and non-ozone depleting Puron refrigerant.

For a trustworthy air conditioning installation, call Welzig Heating and Air!

We take the time to determine the requirements of your size and style of space, and enable complete management and precision control over your indoor climate.  By coordinating your installation project to a strict plan for time and budget, every step is handled promptly, properly, and professionally.  Since 1994, Welzig Heating and Air has continued to perfect comfort throughout Boulder, Longmont, Louisville, and Lafayette, CO.

Satisfied Customers
They Speak For Us

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.


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.

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