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Seasonal Air Conditioning Maintenance in Longmont, CO

Boulder, Longmont, Louisville, and Lafayette, CO is a land of contrasts. When it is cold, it is very, very cold, but when it is hot it is scorching. A well maintained and regulated HVAC system will service you well, but it requires annual air conditioning maintenance. To make sure your cooling system performs its very best, and has the longest possible lifespan, consult the experts at Welzig Heating and Air about the best tactics and techniques for air conditioner maintenance.

Regular inspections, tune-ups, and cleaning of your air conditioner and ductwork will ensure heightened indoor air quality, superior cooling, and lower utility costs. The certified HVAC experts of Welzig Heating and Air have been serving Boulder, Longmont, Louisville, and Lafayette, CO since 1994, providing the highest quality in HVAC equipment, service, and customer satisfaction. We are also available 24 hours a day, 7 days a week for emergency repairs and air conditioning maintenance.

Protect Your Investment with Welzig Heating and Air AC Maintenance

Welzig Heating and Air is family owned and operated. We live in Boulder, Longmont, Louisville, and Lafayette, CO and are proud to serve our community. Contact us today to set up an appointment, or just to ask questions about heating and air conditioning maintenance. We pride ourselves on superior customer service, which is why we are BBB accredited, NATE certified, and have won the esteemed Bryant Factory Circle of Champions three years in a row.

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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