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Welcome to Welzig Heating and Air, your trusted service provider for all of your air conditioning needs for your home or business in Boulder, CO! When it comes to keeping your home or business safe, comfortable, and efficient during the hottest months of the year, it’s crucial to have an air conditioning system you can depend on. To ensure you have a cool environment year after year, we provide a range of air conditioning services including new installations, system replacements, comprehensive maintenance and tune-ups, and intricate repairs.

We understand how inconvenient it can be when your cooling system breaks down. This is why we are available around the clock 24/7 with NATE-certified experts at your service. Our professionals will arrive quickly to diagnose and repair any AC issues you might be dealing with. To extend the life of your cooling equipment, make sure to contact us for our AC maintenance services. With comprehensive tune-ups and 21-point safety inspections, we’ll make sure your cooling system is always running in optimal condition.

When you’re in need of a new AC system installation or replacement, you’ll find we offer the best installation services in town! We can install a number of cooling systems including heat pumps, ductless mini-splits, rooftop units, packaged systems, central air conditioners, and more! When you’re seeking the best AC service in Boulder at competitive prices, give us a call at 720-336-3777 for a free estimate or consultation!

Satisfied Customers
They Speak For Us

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.


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!

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