Commercial HVAC Service Professionals in Longmont, CO

At Welzig Heating and Air, we understand how essential it is to have a reliable and functional HVAC system in your business building in Longmont, CO. Our team of skilled and highly trained NATE-certified professionals are equipped to handle all of your commercial HVAC needs. We take care of new installations, system replacements, repairs, and maintenance of rooftop units, packaged systems, chillers, boilers, and other split systems.

Commercial HVAC RepairCommercial HVAC ServicesEmergency Commercial HVAC Services

When it comes to new system installations, we’re the best in town. As a Bryant Factory Authorized Dealer, we’ll help you discover some of the finest performing commercial systems on the market. We understand that every commercial property is unique, and we will help design the ideal HVAC system for your specific needs for a safe, comfortable, and productive environment. If you have HVAC equipment that is acting up, we’re available 24/7 for emergency repair services. We work quickly, efficiently, and provide quality repairs that are guaranteed to last. To ensure the longevity of your commercial HVAC equipment, it’s always best to seek out our maintenance services. We can keep your systems running smoothly and reliably with minimal risk of system breakdowns and costly repairs. When your HVAC equipment reaches its end of life, we’ll help you determine the most appropriate HVAC system replacement for your comfort needs and budget.

Your Trusted Commercial HVAC Service Team

At Welzig Heating and Air, we’re proud to offer competitive pricing, quality services, and 100% customer satisfaction. We’ll go above and beyond to make sure you’re happy with our services and we always work hard to exceed your expectations. Make sure to give us a call when you’re looking for quality commercial HVAC services done right!

Emergency Commercial HVAC Services, Commercial HVAC Services & Commercial HVAC Repair Boulder, CO, Longmont, CO & Louisville, CO

Emergency Commercial HVAC Services, Commercial HVAC Services & Commercial HVAC Repair

Commercial HVAC RepairEmergency Commercial HVAC ServicesCommercial HVAC Services

Satisfied Customers
They Speak For Us

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.


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!

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Longmont, CO