Welzig Mechanical
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Welzig Mechanical
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 303-532-4960 anytime you need us. Our dedicated technicians are on-call, ready to handle any challenge, 24 hours a day, 365 days a year.

For your convenience, we also provide various financing options, including 60 months financing with approved credit. Until further notice, we will wear a mask and gloves upon client request, or if our team member is more comfortable doing so. Whether you're confronted with a minor maintenance issue, safety concern, or system failure, don't hesitate to call 303-532-4960 for expert assistance.
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Jimmy Welzig and his bride Jalene founded this company in 1994. Together they have strived and succeeded in making this company the largest family owned HVAC company in Northern Colorado. Customer Satisfaction is our TOP priority. Jim and Jalene reside in Mead with their farm of animals and children.
Indoor air pollution is now considered by the Environmental Protection Agency to be the fourth greatest environmental threat to Americans. Most people spend ninety percent of their life indoors, and unfortunately, indoor air is anywhere between ten and one hundred times more polluted than outdoor air.
Emergencies happen, usually at the worst time. Welzig Heating & Air understands and we are here to serve you, our clients, 24 hours a day, 7 days a week.even on holidays and special occasions! We have well-equipped and trained technicians available, driving in our fully stocked vans with hundreds of specialty parts and materials to provide you with immediate comfort as often as possible.
Our names are Jimmy and Jalene Welzig. We are the owners of Welzig Heating and Air. I started our company in 1994, along side my bride Jalene, after working in this industry for many years prior. We are family owned and operated, located in Longmont. We have made Longmont our home since 1974. We incorporate trust and our high standards in every aspect of our business.
We service all towns listed below. If you are located in any of the following towns or their surrounding areas, please give us a call today at 303-532-4960 with any home comfort questions. Casey, I am glad I chose your company to help with my air conditioner problem.
Reviews (10)
Gretchen Bustamante
Gretchen Bustamante
Dec 01, 2021
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I called on Sunday for emergency service for a loud and squeaky furnace. I was told that I don’t need to have it done emergently and that it could wait til a scheduled time Tuesday. Overnight Sunday the furnace died and I called back for emergency service at 6 am and was told that no one was on call and no one could come look at it til my scheduled time Tuesday.
Despite advertising it, this company does not offer 24/7 emergency service.
Matthew Barrett
Matthew Barrett
Oct 14, 2021
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I have likely submitted a review previously, I just had such a great experience yesterday that I wanted to add to what has been said. Welzig has been our go to HVAC company for about ten years. Our experience has been that their technicians start at "good" and only get better from there. When it is a newer tech I feel that they have a lot to live up to, but the training that Welzig uses must work because even the couple of newer people have met the standard I expect.
Yesterday, Welzig installed an on demand water heater. Saul and William were both very polite and professional. Saul specifically
Paula Williams
Paula Williams
Aug 02, 2021
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This was the first time I've tried Welzig, and it was a great experience. In the middle of a heat wave, they came to fix my AC, even though I wasn't an existing customer. The tech, Bob Chrisley, was wonderful. He explained everything in detail, showed me pictures of the problem, and fixed it in no time. I'll definitely be using Welzig again.
William Doyle
William Doyle
Jul 03, 2021
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While the service was prompt and professional, it's very unfortunate that Welzig has decided to charge an exorbitant amount for R22 coolant. On eBay it ranges from $25-35 per pound. I was charged $150-200 per pound. The tech made sure to justify the cost by bringing up the scarcity of R22, which was not exactly honest. Paid almost $800 for what took the technician literally 5 minutes to do. I know we all know need to make a buck, but damn Welzig! That is straight up robbery. I highly recommend people go elsewhere for hvac help.
Chris Parks
Chris Parks
Mar 28, 2021
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Bob came out to my house when our heater stopped working at 10 pm at night. He was cheerful despite the late hour and it was immediately obvious he knew what he was doing. He got our heat working but predicted it might not last the night due to a problem with a part. (Nothing dangerous) He promised to come back the next day. As predicted, the heat lasted a few hours and then stopped. The next day Bob was back and at work. It took several hours and replacing one part led to replacing another, but he got us back in business and the system has performed flawlessly since then. Great guy, great company
Kirk Christoffersen
Kirk Christoffersen
Mar 23, 2021
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Positive: Professionalism, Quality, Responsiveness
I was very grateful that Bob Chrisley at Welzig was able to promptly come diagnose and fix a complex problem with our furnace. Our furnace started to fail right before a giant snow storm! Bob was very professional and courteous and was able to succinctly explain the problem that he fixed. Highly recommend Welzig.
Service: Repair HVAC
Clare Fallon
Clare Fallon
Mar 04, 2021
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Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
Outstanding service all the way around! We could not be happier with our new furnace and the Welzig Team! Casey, Jeremy, Carlos and Dave were total professionals! On time, courteous, and they know their stuff! We recommend them 100%
Services: Install thermostat, Install heating system, Install AC
Char Schmoker
Char Schmoker
Mar 04, 2021
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Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
Again, Welzig's pros saved our day. This time Jake sorted out what went wrong with our furnace, fixed it, and made several reasonable recommendations to go forward. We appreciated his friendly professionalism, clear explanation, thorough work, and eye for safety. Mostly we're glad to have our furnace humming along again--thanks Jake!
Service: Repair heating system
Howard Rosetsky
Howard Rosetsky
Feb 27, 2021
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Positive: Professionalism, Punctuality, Quality, Responsiveness, Value
Jake called and said he could come over earlier than planned. That was fine with us, and he was here and gone in an hour. He was friendly, and our dogs figured that out quickly. Quick, friendly service for a reasonable price. Works for us !!
Service: Heating maintenance
Brooks Mitchell
Brooks Mitchell
Feb 19, 2021
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Positive: Professionalism, Punctuality, Quality, Responsiveness
Michael H. came out last Friday and did a great job talking us through our HVAC/Heating system (we bought the house in May '20 and Welzig installed the system for the previous owner.) He was helpful and professional. The whole process from booking to having him come out was super easy and we'll use them again in the future!
Services: Heating maintenance, AC maintenance, HVAC maintenance