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AC Service from Welzig Heating and Air

Representing quality in every area of service

Representing quality in every area of service, Welzig Heating and Air is the right solution for every air conditioner requirement in Boulder, CO and surrounding areas. We rise to the occasion, resolving challenges, introducing innovation, and achieving your goals. From ideal comfort to exceptional energy efficiency, reliability, and control over the indoor environment, we prove higher standards of products and job performance to deliver greater rewards today and in the years to come.

Whether you’re looking into a central air conditioner, heat pump, or ductless split system installation, upkeep or repairs, no matter the make or model, Welzig Heating and Air ensures satisfaction guaranteed. Take us up on a free estimate on equipment replacement and ask about our Comfort Club. Available in three levels, our maintenance plans include a 21-point inspection, up to 15% off the cost of repairs, and a 10% discount on equipment replacement. Along with 12, 24, and 36-month warranties on repairs, you enjoy the convenience of priority scheduling, and with the platinum plan, we eliminate trip fees.

Air Conditioning Repair, Maintenance, and Installation

Family Owned and Operated, Welzig Heating and Air is dedicated to elevating comfort and air quality while trimming expenses and environmental impact for home and business owners across Boulder, Longmont, Louisville, and Lafayette, CO. We look forward to sharing the latest cooling technology and giving you confidence in the peak performance of your air conditioner. No matter the time of day or night, you can always reach us at (720) 336-3777. Our experienced technicians remain on-call 24/7 to serve your best interests.

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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