Colorado Heating and Air Conditioning Specialists

Welcome to Welzig Heating and Air Your

Colorado Heating and Air Conditioning Specialists

We are a locally owned and operated company since 1994.
We know how to save you money on your
Heating and Air Conditioning Needs!

Proudly Serving Colorado in the Following Locations:
Longmont, Boulder, Dacono, Erie, Firestone, Fort Collins, Frederick, Gunbarrel,
Lafayette, Louisville, Loveland, Mead and Niwot!

Welzig Heating and Air has been the Recipient of
Angies List Super Service Award for 2 Consecutive Years!!


This exclusive recognition is given annually to approximately 5% of service companies who achieved and maintained a superior service rating on Angie’s List throughout the past year.

This prestigious award recognizes the Welzig Team’s dedication to customer service and quality work and is highly esteemed by members of Angie’s List.

We are proud to sell and service the LENNOX™ line of high quality and reliable furnaces and air conditioners. We have earned the title of LENNOXPremier Dealer through our employees’ commitment to 100% customer satisfaction. We specialize in servicing both residential and commercial heating and air conditioning customers.

In addition to furnaces and air-conditioners, we also install and service boilers, heat exchangers, both tank and tankless hot water heaters, programmable thermostats and a wide array of accessories to satisfy all your heating and air conditioning requirements.

Hi, my name is Jimmy Welzig. Thank you for visiting our website and if you have any questions or concerns please give us a call at (303) 678-5576 or email me at