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hvac service graphicAll manufacturers recommend professional tune-ups for your air conditioner.  The value of your investment in proactive measures, however, relies on the quality of service.  At Welzig Heating and Air our commitment to exacting standards adds up to superior rewards for our residential and commercial customers across Boulder, CO and surrounding areas.  Family owned, we recognize the importance of seasonal maintenance of all makes and models of HVAC systems, and approach each service call as an opportunity to protect against malfunctions, elevated sound levels, contaminated air quality, decreased capacity, and premature equipment failure.  Our fully licensed team of technicians are NATE-certified, factory trained to strict criteria, and follow proven service procedures.

AC service you can trust!

According to studies completed by the Environmental Protection Agency, indoor air is often seventy times more polluted than outdoor air.  Unfortunately, contaminated cooling equipment is often to blame.  The wet, dark environment within the system is the ideal breeding ground for mold, fungi, and bacteria, resulting in airborne spores, odors, health risks, decreased airflow, reduced equipment efficiency, and shortened service life.

Call Welzig Heating and Air for air conditioning service throughout Boulder, Longmont, Louisville, and Lafayette, CO!

A dirty air conditioner not only blows unwanted particles throughout your home, a buildup of dust prevents the coils from absorbing or releasing heat, causing components to work harder to compensate.  Excess wear and tear leads to greater energy use, more frequent repair needs, and shortened system life.  Through regular, proper cleaning, troubleshooting, and adjustment, Welzig Heating and Air maintains your air conditioner in peak condition, saving you from needless expense, disruption, and discomfort.  Call us today to schedule a convenience appointment for seasonal upkeep 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.


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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