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24/7 HVAC Repair Service in Longmont, CO

Heating and cooling equipment failures aren’t limited to convenient times. The system tends to malfunction while working the hardest, when weather conditions are most severe. With temperatures ranging from the teens to the nineties in Longmont, Colorado, there’s excessive wear and tear on components and an accelerated chance of problems. No matter when you’re faced with an issue, Welzig Heating and Air remains available.

Established in 1994, we’ve proven that prompt response is often the key to minimizing damage, disruption and expense. Waiting until regular business hours isn’t always possible or a good idea. Call us at (720) 336-3777, anytime round-the-clock to access skilled HVAC repair. Our technicians are NATE-certified, factory trained and proficient in furnaces, boilers, air conditioners, high-velocity units, ductless mini-splits, heat pumps, dual fuel systems and more, regardless of brand.

Your Emergency HVAC Repair Experts, Welzig Heating and Air

Welzig Heating and Air is a family owned and operated HVAC provider, BBB accredited and committed to integrity, reliability and successful solutions to all comfort challenges. As a Bryant Factory Authorized Dealer, we’ve won the Circle of Champion Award three years in a row. Get the help you need when you need it. Never hesitate to utilize our experience, expertise and unmatched professionalism. We offer residential and commercial 24/7 emergency HVAC services in Longmont and the surrounding areas.

Satisfied Customers
They Speak For Us

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.


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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