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A long journey across the Great Plains in 1862 brought newlyweds, Lafayette and Mary Miller to the perfect spot to farm.  Sixteen years later, widowed with six small children to raise, Mary Miller built a town within 37 acres of the the family land.  Encouraged by the coal-mining boom, Lafayette supported two banks and four hotels by 1914.

Reliable HVAC Services in Lafayette, CO

As the mining industry declined, due to natural gas largely replacing coal, Lafayette once again become an agriculture-based community.  With the expansion of Denver and Boulder, the town continued to grow residentially, and gradually developed a commercial, small industrial, and manufacturing economy. Today, Lafayette remains true to its original heritage while offering a thriving and modern community.

Call our Lafayette, CO heating & cooling company for all your HVAC needs!

Welzig Heating and Air is proud to serve the commercial and residential heating, cooling, air quality, and water heating needs of Lafayette.  We provide a trusted, economical, and skilled source for a full range of services, including new design/installation, equipment upgrades, seasonal maintenance, and prompt repair.  Our focus is quality, and as a family owned business, we take every extra step to earn your satisfaction. Rest assured, when you call on us at (720) 336-3777, we answer with a team of factory trained, NATE-certified, and dedicated professionals who are prepared to resolve any challenge.

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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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