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Welzig Heating and Air takes pride in providing expert AC repair services to homeowners and business owners throughout Boulder, CO and surrounding areas. As a Google Guaranteed Service Provider and winner of the Bryant Circle of Champions award three years in a row, we are devoted to providing our clients with the best services in our community. When you have an AC system that is giving you trouble at your home or business, you can count on our team of NATE-certified experts to provide efficient repairs that are guaranteed to last!

Whether you’re dealing with a refrigerant leak, faulty compressor, or malfunctioning thermostat, our team of experienced technicians are fully equipped with the latest tools and technology to diagnose and repair the problem in a timely fashion. We never cut corners or provide band-aid fixes, only repairs that are done with quality workmanship and will keep your system running smoothly moving forward.

Since 1994, our company has been family owned and operated. We have managed to build a solid reputation for integrity, honesty, and dependability in all of the work that we do. When you’re looking for expert AC repair service done by NATE-certified technicians who will treat you like family, make sure 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.


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.

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