Mission Statement:

We shall, through honesty and integrity, strive to always provide extraordinary customer service, uphold a respectful, positive, and encouraging work atmosphere, as well as provide training that promotes exceptional team member growth and success


Our names are Jimmy and Jalene Welzig. We are the owners of Welzig Heating and Air. I started our company in 1994, along side my bride Jalene, after working in this industry for many years prior. We are family owned and operated, located in Longmont.

We have made Longmont our home since 1974. We have 5 children together, Casey (1988), Cassy (1990), Wyatt (1998), Grace (2001), and Faith (2009).

We incorporate trust and our high standards in every aspect of our business. I firmly believe the difference between a good company and a bad company is how they respond to the customer.

At Welzig, we have developed a system with a high standard of procedures, extensive training for all our team members, and the latest technology, in order to give you, our valued customer, the highest quality customer service.

Our technicians, installers, and office personnel are required to take the latest technical training, classes, and certifications. We have built our own state-of-the-art training center for our technicians and office personnel. In addition to that, Welzig provides and requires NATE certifications and factory training.

Every job is unique and personalized, so we build custom fittings for your home right here in our extensive fabrication shop.

All employees that show up at your home will be clearly marked in a Welzig Uniform, insured and bonded, and have the correct tools and training to complete the job in a timely and professional manor with the smile you have grown to expect.

We strive to provide superior service and solutions. Cooling, heating, and conditioning the air you breathe.

We’re Not Comfortable Until You Are!

Satisfied Customers
They Speak For Us

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.


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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