High-velocity heating and cooling systems provide an ideal solution for older homes that lack ductwork, tight spaces, and all different types of challenges. Like any other style of HVAC, the equipment requires proper care to continue to operate at peak capacity. Welzig Heating and Air is happy to help. Our attention to detail, standards of workmanship, and determination to be the very best at what we do supports our satisfaction guaranteed on every job.

High-Velocity Heating and Cooling Service

Understanding the importance and impact of the efficiency, reliability, and longevity of your high-velocity system, Welzig Heating and Air strongly recommends our Comfort Club maintenance plans. With three levels of coverage, we cater perfectly to your needs. Along with intensive inspection, we offer 12, 24, or 36-month warranties on repairs, up to 15% discount on repairs, and options such as no trip fees and priority scheduling.

Trusted Professionals for Your HVAC Needs

Have concerns with your high-velocity heating/cooling system? Let the professionals from Welzig Heating and Air evaluate the operation, explain our diagnosis, and focus on the most rewarding course of action. We achieve value by optimizing the dependability, sustainability, and efficiency of the equipment. Our highly-trained technicians remain accessible 24/7 across Boulder, Longmont, Louisville, and Lafayette, CO. At Welzig Heating and Air, we specialize in high-velocity heating and cooling upkeep repairs.

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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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