Longmont, CO Furnace Replacement Service

Furnace replacement involves a lot of important decisions. You want to choose the ideal time to make the upgrade and install a heating system that will not only handle the severe winter weather in Longmont, but operate reliably and efficiently. Everything from management and maintenance responsibilities to sound levels, warranty and safety features are priorities. Make the transition easy and satisfying by reaching out to Welzig Heating and Air.

With 30 years under our belts, Welzig Heating and Air has fulfilled every type of residential and commercial temperature control demand. We’ve opted to meet the high standards of a Bryant Factory Authorized Dealer because we believe in the durability, innovation and longevity of the line of furnaces we offer. By going above and beyond in our mission to be the best at what we do, we’ve received the Bryant Circle of Champion Award three consecutive times.

New Furnace Installation Experts at Welzig Heating and Air

Our factory trained, NATE-certified technicians take the time to explain options and customize recommendations. Swapping the current furnace for an exact replica won’t necessarily maximize potential or perfectly suit today’s and tomorrow’s requirements. Through proper sizing, modern smart technology and a design tailored to specifications, Welzig Heating and Air helps you trim running costs, optimize comfort and enjoy the rewards of furnace replacement all winter, year after year.

Furnace Replacement, Furnace Installation & Furnace Service Boulder, CO, Longmont, CO & Louisville, CO

Furnace Service, Furnace Installation & Furnace Replacement

Furnace ServiceFurnace InstallationFurnace Replacement

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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Longmont, CO