Business Details
32 Years
experience
Emergency
services
Trusted HVAC & Plumbing Services in Longmont, CO
Since 1994, Welzig Heating & Air has served the Longmont and Greater Boulder area as a trusted provider of HVAC, plumbing, and electrical services. As a Bryant Factory Authorized Dealer, we adhere to rigorous standards of technical competence, business ethics, and customer satisfaction. Our NATE-certified technicians undergo factory training and continuous education in advanced technologies, ensuring precise system installations, accurate diagnostics, and immediate resolution of common issues. Equipped with cutting-edge tools and genuine manufacturer parts, we specialize in HVAC maintenance, plumbing solutions, and electrical repairs for residential and commercial clients.Recognized as a three-time Bryant Circle of Champions awardee, we prioritize client satisfaction through transparent communication, reliable service delivery, and a commitment to sustainable performance. Our teams expertise extends to indoor air quality optimization, emergency services, and energy-efficient system upgrades, serving communities including Boulder, Fort Collins, and Louisville. With a focus on long-term relationships, we offer financing options, maintenance plans, and 24/7 emergency availability to meet diverse customer needs.
Services
HVAC Installation
Plumbing Repair
Electrical Services
Indoor Air Quality
Emergency Repairs
Tankless Water Heaters
Duct Sealing
Commercial HVAC
EV Charger Installation
Whole Home Filtration
Details
- Year established: 1994
Highlights and features
- We employ NATE-certified technicians with factory training and advanced tools.
- Our 24/7 emergency services ensure immediate response to urgent HVAC needs.
- Financing options available for approved credit applicants.
- Serving Northern Colorado communities since 1994 with localized expertise.
- Three-time Bryant Circle of Champions awardee for service excellence.
Associations and certifications
- Bryant Factory Authorized Dealer
- NATE-certified
- Circle of Champions
What people say
Excellent job
Very professional
Knowledgeable diagnosis
Highly recommend
Polite and professional
Services
HVAC Installation
We specialize in installing Bryant HVAC systems, including air conditioners, furnaces, and heat pumps. Our technicians ensure proper sizing and configuration for optimal energy efficiency and comfort. Backed by manufacturer warranties and industry certifications, our installations include comprehensive testing and customer education on system operation.
Plumbing Repair
Our licensed plumbers address leaks, clogs, and system failures for residential and commercial properties. Services include water heater repairs, drain maintenance, and gas line servicing. We utilize advanced diagnostics to identify issues and provide lasting solutions using high-quality replacement parts.
Indoor Air Quality
We improve indoor air quality through UV filtration, ionization systems, and whole-home purifiers. Our solutions target allergens, pathogens, and pollutants, reducing health risks and enhancing HVAC efficiency. Installation includes GPS and PuriFi systems that continuously monitor and clean air.
Emergency Repairs
Available 24 hours daily, our emergency team responds to urgent HVAC and plumbing failures. Equipped with mobile service units, technicians resolve critical issues like furnace breakdowns, burst pipes, and electrical malfunctions to restore safety and comfort immediately.
Commercial HVAC
We provide tailored HVAC solutions for commercial properties, including installation, maintenance, and energy audits. Our services cover high-velocity systems, ductless units, and sheet metal fabrication. Scheduled maintenance plans help businesses maintain compliance and operational efficiency year-round.
People
Casey Welzig
Owner/Operator
Casey Welzig leads the company with over 25 years of HVAC industry experience, focusing on customer education and system optimization. He oversees technical training and service standards.
Max Loustaunau
Lead Technician
Max Loustaunau specializes in HVAC installations and Bryant system upgrades, bringing precision and care to residential projects while mentoring junior technicians.
Bob
Service Technician
Bob provides expert diagnostics and repairs for cooling systems, known for his patient approach to customer education and problem-solving.
Dave Kaplan-Gomez
Plumbing Specialist
Dave Kaplan-Gomez installs and repairs water heating systems with attention to minimizing property disruption during service calls.
James Miltersen
Senior Technician
James Miltersen combines plumbing expertise with a focus on customer satisfaction, handling complex installations while maintaining clear communication.
Questions
What HVAC services do you offer?
We provide installation, repair, and maintenance for air conditioners, furnaces, heat pumps, and indoor air quality systems.
Do you service plumbing emergencies?
Yes, our 24/7 emergency team handles urgent plumbing issues like leaks, clogs, and water heater failures.
Are financing options available?
We offer financing plans for approved credit applicants to cover HVAC, plumbing, and electrical upgrades.
Which areas do you serve?
We operate throughout Northern Colorado, including Boulder, Longmont, Fort Collins, and surrounding communities.
What certifications do your technicians hold?
Our team includes NATE-certified technicians with Bryant factory training and ongoing professional development.
Do you offer maintenance plans?
Yes, we provide customized maintenance agreements for HVAC, plumbing, and electrical systems to prevent breakdowns.
Reviews (6)
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
Yesterday, Welzig installed an on demand water heater. Saul and William were both very polite and professional. Saul specifically
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.
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
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
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
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
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
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
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
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
