In the world today, air conditioning has become a necessity for most homes and businesses. To keep your home or office space comfortable, safe, and cool, it’s necessary to have a dependable cooling system. At Welzig Heating and Air, we’re proud to offer expert AC service to homeowners and business owners in Longmont, CO and surrounding areas! You can count on our NATE-certified technicians to cover any service you need including new AC system design and installation, system replacements, quality repairs, and 21-point safety inspections and tune-ups.

Whether you’re in need of maintenance to ensure smooth operation of your equipment, repairs for a struggling system, or a complete AC system replacement, we have you covered. Our maintenance service is thorough and we’ll carefully check your whole system for signs of wear and tear. We’ll also lubricate moving parts, clear out debris, clean or replace air filters, check electrical connections, and ensure all safety features are fully operational with your AC system. If you have any issues with your system such as refrigerant leaks, spikes in your utility costs, lack of airflow, or other problems, don’t hesitate to give us a call for quick and efficient repairs to restore comfort in your living or working environment.

If you’re in the market for a new AC system installation or replacement, you’ve come to the right place! As a Bryant Factory Authorized Dealer, we have access to the most energy efficient cooling systems that are built to last. We’ll help you design the ideal AC system that will meet the cooling needs of your environment and provide superior comfort with improved air quality. We’ll make sure your new system is properly tested to ensure safe and efficient operation. To keep your new system protected, don’t forget to ask about our customized maintenance plans which will ensure smooth operation, extended lifespan of your equipment, and peace of mind knowing your AC system will not break down. When you want the best AC service in Longmont, make sure to give us a call at 720-336-3777!

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

AC tune-up, Air conditioning service & Cooling system service

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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.


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!


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.

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Longmont, CO