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air conditioning repair by WelzigWelzig Heating and Air provides expert air conditioner repair across Boulder, CO and surrounding areas.  We employ a team of factory trained, NATE-certified professionals who are dedicated to higher standards of quality.  While a quick fix might cost less today, the bigger problems down the road quickly add up to greater expense and aggravation.  By not settling for anything less than peak performance from your cooling equipment, we deliver sustainable operation and long-term comfort.  Whether you’re confronted with minor maintenance issues or sudden system failure, Welzig Heating and Air works on all makes and models, protecting the value of your investment.

Dedicated AC Repair Contractors

Our licensed technicians are never more than a phone call away.  Providing 24 hour Emergency Service throughout Boulder, Longmont, Louisville, and Lafayette, CO, Welzig Heating and Air puts our extensive resources at your disposal.  Our fleet of service trucks are clearly recognizable and fully outfitted with a broad range of genuine manufacturer’s replacement parts.  Combining our expertise and practical knowledge with leading-edge diagnostic equipment, we resolve the majority of problems on the spot.

Call Welzig Heating and Air for air conditioning repairs you can count on!

Know that a repair from Welzig Heating and Air protects the integrity and performance of your cooling system, restoring the efficiency, sound levels, and capacity to deliver superior satisfaction.  Family owned, we first opened our doors in 1994, and because we’ve refused to compromise our standards of quality in every aspect of service, we continue to represent superior solutions to temperature control across Boulder, Longmont, Louisville, and Lafayette, CO.

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.


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!

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