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At Welzig Heating and Air, we’re proud to provide top-tier air conditioning installations for homeowners and business owners throughout Boulder, CO and surrounding areas. We are a family owned and operated business and we have served our community with professional HVAC services since 1994! You’ll find that our NATE-certified technicians are fully equipped and have the expertise to tackle any new AC installation project whether it’s big or small.

When it comes to new AC installation, we realize that every property has unique requirements. We’ll work with you carefully and assess your property to determine the best design for your new AC installation. As a Bryant Factory Authorized Dealer, we have access to some of the most impressive and energy efficient cooling systems. We can install a number of systems including central AC systems, heat pumps, rooftop units, packaged systems, and much more! Once your new cooling system is installed, we’ll test it carefully to ensure safe and efficient operation.

We always want to make sure our clients are satisfied with our services which is why we will follow up to see how your experience was with our NATE-certified experts. We’ll also check to see if you have plans for future maintenance to keep your new cooling system protected. We recommend enrolling into our Comfort Club which grants you enormous benefits such as discounted repairs, discounted replacement services, and peace of mind with a system that has minimal risk of experiencing problems. When you want quality AC installation service in Boulder, don’t hesitate to give us a call at 720-336-3777!

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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