Business Details
32 Years
experience
Emergency
services
Expert HVAC, Plumbing & Electrical Services in Longmont, CO
Welzig Heating & Air has served Longmont and the Greater Boulder Area since 1994, combining immediate results with sustainable performance to protect client investments. As a Bryant Factory Authorized Dealer, we meet rigorous standards for technical competence, business ethics, and customer approval. Our NATE-certified technicians undergo factory training and stay updated on progressive technology. Equipped with leading-edge tools and genuine manufacturer parts, we properly size and install systems, diagnose existing systems, and resolve most issues on-site. We pride ourselves on being an award-winning member of Bryants Circle of Champions for three consecutive years, reflecting our commitment to high-efficiency equipment sales and exceptional service.Our team prioritizes client satisfaction through personalized solutions for HVAC, plumbing, and electrical needs. With 24/7 emergency services and a focus on customer education, we ensure reliable support for residential and commercial clients. Our reputation is built on decades of trust, demonstrated by testimonials highlighting professionalism, expertise, and transformative results. From air quality innovations to plumbing inspections, we deliver tailored solutions that enhance comfort and value. Backed by financing options and special offers, we remain accessible to all clients while maintaining industry-leading standards.
Services
HVAC Repair
Plumbing Installation
Electrical Services
Tankless Water Heaters
Air Quality Systems
Commercial HVAC
Drain Repair
EV Charger Installation
Boiler Services
Maintenance Plans
Details
- Year established: 1994
Highlights and features
- 24/7 emergency services available for urgent HVAC, plumbing, or electrical issues
- NATE-certified technicians with factory training and ongoing technical education
- Financing options available for approved credit to support budget-friendly upgrades
- Serving Northern Colorado communities since 1994 with proven expertise
- Award-winning Bryant Factory Authorized Dealer with advanced air quality solutions
Associations and certifications
- Bryant Factory Authorized Dealer
- NATE-certified
- Circle of Champions
What people say
Excellent job
Very professional
Remarkably helpful
Highly recommend
Amazing new system performance
Services
HVAC Repair
Our NATE-certified technicians provide rapid diagnosis and repair of heating and cooling systems, including furnaces, air conditioners, and heat pumps. Using factory-trained methods and genuine parts, we restore efficiency and extend system lifespan. Clients benefit from same-day solutions and 24/7 emergency availability.
Tankless Water Heaters
We specialize in energy-efficient tankless water heater installations and repairs. Our experts ensure proper sizing and integration with existing plumbing systems for continuous hot water supply. Clients enjoy reduced energy costs and space savings compared to traditional units.
Air Quality Systems
We offer advanced air purification solutions including UV filtration, ionization, and smart monitoring systems. These technologies eliminate 99% of airborne pollutants within 24 hours, addressing allergens, pathogens, and odors. Clients receive tailored recommendations for healthier home environments.
Plumbing Installation
Our licensed plumbers handle full-system installations, including water lines, fixtures, and drainage. We specialize in tankless water heaters, sump pumps, and whole-home filtration systems. Clients receive durable solutions compliant with local building codes and manufacturer warranties.
Commercial HVAC
We provide scalable HVAC solutions for commercial properties, including high-velocity systems and preventive maintenance plans. Our team ensures optimal climate control for businesses while minimizing energy consumption. Clients benefit from extended equipment lifespan and operational cost savings.
People
Casey Welzig
Owner/Operator
Casey Welzig leads with over 25 years of HVAC industry experience, guiding the company's technical and service standards since its 1994 founding.
Max Loustaunau
Senior Technician
Max Loustaunau specializes in HVAC installations, bringing precision and expertise to complex system replacements with a focus on customer education.
Seth Bernhardt
Lead Installer
Seth Bernhardt delivers meticulous HVAC installations, ensuring optimal performance through proper system sizing and manufacturer-compliant procedures.
Bob
Service Technician
Bob provides expert cooling system diagnostics and repairs, combining technical knowledge with clear client communication about system maintenance.
Dave Kaplan-Gomez
Plumbing Specialist
Dave Kaplan-Gomez performs professional plumbing installations, including tankless water heaters, with careful attention to property protection during service calls.
Questions
What HVAC services do you offer?
We provide complete HVAC services including AC repair, furnace installation, duct sealing, smart thermostat integration, and 24/7 emergency repairs for residential and commercial clients.
Do you service plumbing emergencies?
Yes, our 24/7 emergency services include urgent plumbing repairs for leaks, drain issues, and water heater failures across Northern Colorado.
Are financing options available?
We offer financing plans with approved credit for HVAC, plumbing, and electrical upgrades to make system replacements more accessible.
What areas do you service?
We serve Boulder, Longmont, Louisville, Lafayette, Fort Collins, and surrounding Colorado communities for all HVAC, plumbing, and electrical needs.
How can I improve indoor air quality?
We recommend UV filtration, ionization systems, and smart air quality monitors tailored to your home's specific needs during free consultations.
What certifications do your technicians hold?
Our team includes NATE-certified technicians with ongoing factory training from Bryant and other leading industry manufacturers.
Reviews (2)
Darren Turner
Jun 25, 2017
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i consider you the goto people whenever i or someone i care about has an hvac service or install needed. i was impressed and thankful for the.
Barbara Claxton Steele
Oct 26, 2016
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We have used Wezig for years to do yearly check ups and troubleshooting. Just had Chris install a new thermostat- which we love! Chris is very.
