Longmont, CO Full Service Furnace Maintenance

The best way to ensure superior performance from your heating system is by having regular furnace maintenance. In Boulder, Longmont, Louisville, and Lafayette, CO a reliable furnace is essential, because you never know when the temps will start to drop. Welzig Heating and Air offers a full range of HVAC services, including furnace maintenance, to keep your climate control system working to the best of its ability.

Furnace MaintenanceFurnace ServiceFurnace Warranty

Welzig Heating and Air is a full service HVAC company, providing inspections, tune-ups, repairs, and replacements for whatever make or model of furnace or heating system you have. Don’t wait until the heat stops working, let our certified team of techs ensure that it never stops! In the event of an after-hours emergency, we have experts available 24-7 for furnace repair services.

Your Certified Furnace Maintenance Team in Welzig Heating and Air

When it comes to furnace maintenance in Boulder, Longmont, Louisville, and Lafayette, CO choose a name you can trust. Welzig Heating and Air is a local business, family owned and operated since 1994, with a long history of exemplary customer satisfaction. We are accredited by the Better Business Bureau and certified by NATE (North American Technician Excellence). We are a Bryant Factory Authorized Dealer and were awarded the Bryant Circle of Champions for three years in a row. Choose Welzig Heating and Air for top quality HVAC systems and top quality furnace maintenance.

Furnace Service, Furnace Warranty & Furnace Maintenance Boulder, CO, Longmont, CO & Louisville, CO

Furnace Maintenance, Furnace Warranty & Furnace Service

Furnace MaintenanceFurnace WarrantyFurnace Service

Satisfied Customers
They Speak For Us

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.


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.

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Longmont, CO