At Welzig Heating & Air, we focus on quality.  Recognizing that a cut corner today results in long-term problems and expense, we adhere to strict procedures for service and installation, and recommend only premier products.  While we provide affordable solutions to indoor comfort, we refuse to compromise integrity with subpar equipment, materials, or workmanship.  If you’re looking for residential or commercial heating, cooling, air quality, or water heating services of a higher caliber, Welzig Heating & Air delivers satisfaction across Boulder, CO & Surrounding Areas.  Contact us at 303-678-5576 anytime you need us.  Our dedicated technicians are on-call, ready to handle any challenge, 24 hours a day, 365 days a year.

We are so happy we selected Clarence with CAL Property Care to repair our furnace. He was very easy to schedule an appointment with and actually came out on a Saturday to figure out what the issue was. Clarence had to order a part to complete the repair, but he promptly updated us with the progress every step of the way. Clarence really went above and beyond and I can't say enough for his friendly attitude and quality of work! Thanks again Clarence!
Customer stated their blower fan is consistently running. She has had the furnace off all summer and just fired it up and it will just blow consistently. Upon investigation, the technician found that the damper control was sending 24V to G terminal while switched off. This indicates a stuck closed relay. I disconnected it and tested the unit. Due to age of unit, I would recommend upgrading to a more efficient model.
Our new HVAC unit started to leak badly, so we set up an appointment for an on-site diagnosis. The two-man crew arrived in the agreed-upon window and was very experienced. They gave off the impression that they had seen just about everything before. They quickly found the source of the problem, fixed it, and explained in full what they were doing and why. They also offered up some helpful tips of what to look for and how to self-diagnose issues.
Drilon and Jeremy came out to the house for snaking the sewage line and performing an AC tune up. They were very informative, kind, respectful and professional. Drilon went above and beyond by giving me a whole walk through on our furnace, AC unit and water heater and giving suggestions and prioritizing what he thought would be the most important and safe for our new house right now. They were not pushy with their sales tactics and I will definitely be using them when we are ready to replace our features.
Furnaces and thermostats are not mix-and-match appliances. Using the wrong type of thermostat with a furnace will cause operating problems and can be dangerous. Although thermostats look similar, they are designed very differently. There are numerous types of heating systems and thermostat systems and they need to be coordinated for safe and proper operation. There are three types of thermostat systems used today: millivoltage, low voltage, and line voltage.​
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