Welzig Heating and Air is proud to be your go-to source for efficient and effective AC repair services. We have proudly served residential and commercial customers in Longmont, CO and surrounding areas since 1994 and will go above and beyond to earn your long-term business and satisfaction.

When it comes to keeping your home or business comfortable throughout the hot seasons in our area, having a dependable AC system is very important. Unfortunately, even the best AC systems can develop problems at one point or another. This is why it’s essential to team up with an HVAC contractor that has a proven track record of quality repairs that are done with quality workmanship and precision. Our team of NATE-certified technicians have the training and expertise to ensure your AC equipment is always in good working order. We work on all makes and models of cooling systems and cover fixes for all types of AC problems such as refrigerant leaks, malfunctioning thermostats, broken down compressors, leaking ductwork, electrical issues, and more!

Since problems with your AC system can happen at any time, we’re happy to be available around the clock 24/7 for emergency AC repairs! Whenever your system breaks down or is experiencing serious trouble, don’t hesitate to give us a call right away at 720-336-3777! Our experts will arrive quickly to your property to diagnose and repair the issue with your system, so comfort can be restored promptly in your living or working environment. When you’re trying to find the best AC repair service in Longmont, don’t hesitate to contact us!

AC repair, HVAC repair & Cooling system repair Boulder, CO, Longmont, CO & Louisville, CO

Reliable AC repair services, Cooling system repair & HVAC repair

Commercial air conditioning repairEmergency AC repairAC maintenance and repair

Satisfied Customers
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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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Residential AC repair

Commercial air conditioning repair

Emergency AC repair

AC maintenance and repair

Reliable AC repair services

Longmont, CO