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Longmont, CO Professional Boiler Installation

One of the most dependable and long-lasting heating systems ever invented is the water boiler. For many modern HVAC companies, water boiler installation and repair is a lost art. In Boulder, Longmont, Louisville, and Lafayette, CO there are a lot of people who still rely on the traditional boiler system to keep their homes warm through the long, cold winters. If you have been thinking of installing a water boiler, or need to replace your old boiler, contact Welzig Heating and Air today and learn how we can help you.

Welzig Heating and Air are the local leaders in boiler installation and repair. This is one aspect of providing a full range of heating and cooling services to the people of Boulder, Longmont, Louisville, and Lafayette, CO. No matter what kind of heating system you have, or have considered buying, we can provide expert guidance, advice, and service for your home or business.

Your New Boiler Installation Made Easy with Welzig Heating and Air!

When it comes to water boiler installation, or any other service, our top priority is to give you fast, professional work at a reasonable price. We are a locally owned and operated company, run by a family right here in Boulder, Longmont, Louisville, and Lafayette, CO, and have been certified for excellence by NATE and accredited by the BBB. Available 24 hours a day for emergency repair services.

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!


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.


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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