Reliable Boiler Repair Services in Longmont, CO

A water boiler is one of the most traditional and reliable heating systems ever created. However in our modern age of high technology, the boiler is often overlooked. Welzig Heating and Air takes pride in being a full service HVAC company, skilled in repair and installation of any type of heating system, new or old. To other companies it may be a lost art, and in Boulder, Longmont, Louisville, and Lafayette, CO we are the top name for boiler repair and service.

Boiler RepairBoiler Service

Welzig Heating and Air is a Bryant Factory Authorized Dealer, but our certified technicians are familiar with every brand and style of water boiler. For installation, service, tune-ups, replacement, repair, or water tank installation, we are the only name you need to know for professional boiler service. In case of an emergency we have experts available 24 hours a day, seven days a week.

Your 24/7 Boiler Repair Team, Welzig Heating and Air

Welzig Heating and Air is family owned and operated, and since 1994 we have proudly lived and worked in Boulder, Longmont, Louisville, and Lafayette, CO. Our team of HVAC and boiler repair experts are familiar with the local climate, and the demands placed on our heating systems. Call or email us today to set an appointment, or just to talk to one of our team members, who will be happy to answer all your questions.

Boiler Repair & Boiler Service Boulder, CO, Longmont, CO & Louisville, CO

Boiler Repair & Boiler Service

Boiler ServiceBoiler Repair

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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Longmont, CO