At Welzig Heating and Air, we take pride in offering residential and commercial clients throughout Longmont, CO top-tier AC services to maintain a comfortable and healthy environment throughout the hot summers in our area. Our team of highly trained and experienced NATE-certified technicians have the tools, equipment, skills, and expertise to handle any AC maintenance, repair, or installation job that you require. As a Google Guaranteed Service Provider, we strive to deliver exceptional customer care and satisfaction with every job that we take on.

We’re proud to offer a range of services that cover all of your cooling needs. Some of our services include new AC system design and installation, system replacements, quality repairs, and comprehensive maintenance. When you’re in the market for a new AC system installation or replacement, you’ll find our experts are some of the most reliable technicians to handle the job. As a Bryant Factory Authorized Dealer, we can help you find some of the best built AC systems with a unique design that meets the comfort requirements of your property. Our AC systems are highly energy efficient and built to last, so you can enjoy perfect comfort for many years to come.

The best way to ensure your AC system is protected and running smoothly year after year is to seek our comprehensive maintenance services. With 21-point safety inspections and tune-ups, we guarantee your AC system will run efficiently and provide superior comfort and air quality in your environment. Make sure to ask about our Comfort Club for greater savings and peace of mind with a system that won’t break down on you. When you become a member, you can appreciate discounted labor and repair costs, discounted AC replacements, along with a cleaner and healthier environment. When you want the best AC service in Longmont, give us a call at 720-336-3777 to schedule a free consultation or get a free quote!

Air Conditioning Service, AC Service, HVAC Service & AC Service Near Me Longmont, CO, Longmont, CO, Boulder, CO, Louisville, CO & Lafayette, 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.


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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Longmont, CO