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Dependable Furnace Replacement

Winters in Boulder, Colorado, are especially long, excessively snowy and often excruciatingly cold. The wind chill can be brutal. Keeping a warm home is a priority for anywhere from six to nine months of the year. The performance of the furnace has a significant effect on comfort, air quality, environmental impact and budget. The right heating system, installed properly, is an asset.

Make no mistakes with furnace replacement by calling on Welzig Heating and Air. Take confidence in nearly three decades of experience and successful outcomes. Our extensive resume includes heating installations for all types, sizes and ages of homes throughout Boulder. We achieve more than satisfaction, always exceeding expectations at every stage of the project. From prompt scheduling and swift turnaround to open communication, affordability and the long-term results of our efforts, we set unmatched standards.

Your Furnace Replacement Professionals

Welzig Heating and Air is a Bryant Factory Authorized Dealer and winner of the Bryant Circle of Champions Award for three consecutive years. We can’t wait to share the unprecedented efficiency and customized control of intelligent, intuitive heating technology. Today’s furnaces accommodate room-by-room adjustment, accessibility through your smartphone and automatically adapt output to maintain consistent temperature. Get started by calling us at (720) 336-3777!

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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