As the temperatures start to rise in Boulder, CO, your AC system at your home or business will be working overtime to maintain a comfortable, safe, and healthy environment. If your AC system fails on you, this can become a miserable situation at home or disrupt your business operations. Fortunately, Welzig Heating and Air is here to provide expert AC service to ensure your AC equipment works smoothly and efficiently moving forward. Our NATE-certified professionals cover a range of AC service including quality repairs, comprehensive maintenance, new AC system design and installation, and quality AC replacements.

Over the years, we have built a solid reputation for serving clients in our community with excellence and exceptional customer care. We are honored to announce that we have won the coveted Bryant Circle of Champions award three times in a row. This prestigious award speaks to our level of professionalism, commitment to our customers, and demonstration of outstanding leadership in our community. You can always count on our experts to provide quality workmanship in all the work that we do.

If you have a system that struggles or breaks down on you, you can rely on our professionals 24/7 around the clock for AC emergency repair service. We’ll restore comfort in your environment before you know it! To keep your AC system running smoothly, don’t forget to ask about our Comfort Club. With this membership, you can appreciate special discounts on repairs, maintenance service, and appreciate a system that will continue to serve you well with minimal risk of costly issues. For the best AC service in Boulder, give us a call at 720-336-3777!

AC service, Air conditioning service & HVAC service Boulder, CO, Longmont, CO & Louisville, CO

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Satisfied Customers
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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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Boulder, CO