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heating and furnace repair by WelzigWhen you are confronted by any disruption in the performance of your heating system, there’s a lot at stake.  Your long-term safety, comfort, and budget are all impacted by the quality of repair service.  Contractors who cut corners to deliver a quick fix will be long gone when you’re faced with bigger problems down the road.

Trustworthy Heating Repair Service

Established in 1994, Welzig Heating and Air sets higher standards of satisfaction, and you can rest assured, we’ll still be here, to stand behind our work, throughout the life of your heating equipment.  Whatever the make, model, or style of heating system, our NATE-certified team is equipped with the technical training, in-field experience, and state-of-the-art diagnostic equipment to get to the bottom of concerns quickly.  Fully outfitted and clearly designated service trucks allow us to resolve the majority of malfunctions on the spot.  For repair service that protects the value of your investment, call on the experts from Welzig Heating and Air.

Let Welzig Heating and Air handle your heating repairs and enjoy optimum comfort!

Serving home and business owners across Boulder, CO and surrounding areas, Welzig Heating and Air is family owned and built on an uncompromising commitment to quality.  Our attention to detail, proactive measures, and comprehensive system checks result in enhanced efficiency, longevity, and overall performance from your essential HVAC system.  By combining our expertise with courteous treatment, punctual arrival, and mess-free worksites, we achieve a level of professionalism that is unmatched across Boulder, Longmont, Louisville, and Lafayette, CO.  Welzig Heating and Air is always on-call to assist you, providing Emergency Service 24 hours a day, 365 days a year.  For heating repair that withstands severe weather and high expectations, call us at (720) 336-3777.

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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