Established in 1994. Family Owned and Operated. Satisfaction Guaranteed.
Established in 1994. Family Owned and Operated. Satisfaction Guaranteed.
All of our technicians are following current COVID-19 safety precautions, including wearing face masks. If you have any special concerns, we’re happy to answer your questions! Your comfort and safety are important to us!

We are open and available to serve you!
WELZIG
Heating. Cooling. Plumbing.
Call Us Today!
303-532-4960
  • Home
  • Why Choose Welzig
    • Why Choose Welzig
    • Our Service Area
    • Meet The Team
    • Maintenance Plans
    • FAQ
    • Employment
    • A Peak Inside
  • Services
    • Air Conditioning Repair
    • Heating Repair
    • Maintenance Plans
    • Boilers
    • Indoor Air Quality
    • Commercial HVAC
    • Emergency Services
    • Air Conditioning Service
    • Heat Pumps & Dual Fuel
    • Air Conditioning Installation
    • Heating Service
    • Heating Installation
    • Ductless HVAC
    • Duct Cleaning
  • Plumbing
    • Tank Water Heaters
    • Tankless Water Heaters
    • Boilers
    • Complete Plumbing Inspection
    • Garbage Disposals
    • Sump Pumps
    • Toilets, Sinks, & Faucets
    • Whole Home Water Filtration
    • Outdoor Faucets
    • Gas Lines
    • Pressure Vacuum Breakers
    • Mobile Homes
    • Commercial Plumbing
  • Offers
    • Financing
    • Specials
  • Contact
Welzig always offers FREE estimates on your equipment replacement.

Financing Available – up to 60 months, same as cash with approved credit
Welzig's Service Area
View The Cities We Service
  • $89 Ultimate AC Tune Up

    $89 Ultimate AC Tune Up Special

    Cannot be combined with other offers. Call for full details.

  • Free Global Plasma Solutions NPBI Air Sanitizer with New A/C & Furnace Installation

    With qualifying equipment.

    Cannot be combined with other offers. Call for full details.

  • Up to $1200 Off a New A/C & Furnace Installation

    With qualifying equipment.

    Cannot be combined with other offers. Call for full details.

AC Maintenance, HVAC Service, Air Conditioning Repair, Air Conditioner Installation & Heating ServiceLouisville, CO, Boulder, CO, Lafayette, CO & Longmont, CO

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.

Your comfort and safety are important to us!

Call 303-532-4960 Today!
bryant hvac systems
Heating

Ensure that your furnace is ready for the cold months.
Heating Repairs & Service
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. 24/7 Emergency Service allows you to get the help you need, whenever you need it. For all repairs, we prioritize your best interests, providing the information, cost-effective recommendations, and honest answers that add up to greater value for your investment. Our experienced HVAC specialists are familiar with all makes and models, and focus on repairs that enhance the reliability and performance of your equipment. When the job is complete, rest assured there will be no mess, damage, or discarded debris for you to deal with, and your furnace will be ready to meet demand. At Welzig Heating & Air, we build on a reputation for excellence each time we answer a call for repair across Boulder, Longmont, Louisville, Lafayette, CO & more.
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Cooling

Stay cool when the hot summer rolls in.
Air Conditioning Repair & Service
Welzig Heating & Air is on call, 24 hours a day, 365 days, making sure that the skilled assistance you need is always available.   There’s no need to struggle with decreased performance from your air conditioner.   Even small aggravations, such as elevated sound levels, strange smells, or longer running times, are warning signs of larger issues and usually add up to higher running costs.   When you trust your cooling equipment to Welzig Heating & Air, we work to not only resolve pressing issues. but ensure reliability, efficiency, and longevity.   A thorough inspection often protects against degraded air quality, property damage, and premature system failure.   We work on all makes and models of air conditioners, and with every repair we tackle, our team of dedicated technicians earn your satisfaction.   Through exemplary customer service, ethical business practices, and exacting standards, Welzig Heating & Air provides superior solutions to homeowners across Boulder, Longmont, Louisville, Lafayette, CO & more.
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About Us

Why choose Welzig? We'll tell you.
About Us
Since 1994, Welzig Heating & Air has been providing professional air quality solutions throughout Boulder, Longmont, Louisville, Lafayette, CO & more. We specialize in industry leading products and employ skilled and knowledgeable technicians to do the job right the first time. As a family owned company, we understand how important the quality of your indoor environment can be on your health, comfort, and productivity. When you call the team from Welzig Heating & Air, you’ll enjoy helpful recommendations, convenient appointment times, and rewarding installation service that leaves you feeling refreshed.
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Bryant HVAC

Installing the best, servicing any of the rest.
Bryant HVAC
Bryant has been an industry leader of heating and cooling products for over a century. Innovative Bryant HVAC systems provide dependable solutions to home and commercial comfort and air quality. With everything from heat pumps to gas furnaces and air conditioning systems, Bryant has the products that offer leading-edge technology and precision engineering. Call us today to learn more!
Contact Us
Financing

We have several options available for you with approved credit!
Financing

With flexible financing options from Wells Fargo Bank, N.A., with approved credit, you can enjoy many benefits. From convenient monthly payments to easy-to-use online account management, Wells Fargo Bank, N.A. financing offers top notch service and control over your finances. We know you want to stay comfort without breaking the bank, so we help you manage your expenses. Call us at 303-532-4960 to learn more!

Apply for Financing Now
Special Offers

Save on your home comfort needs.
Special Offers
[coupon] We know you don’t want to spend an arm and a leg on your HVAC systems, which is why we offer convenient special offers for you to take advantage of. We strive to provide the best service at affordable prices so you can feel comfortable without feeling overwhelmed. Give us a call or visit our specials page to get your savings today.
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AC Maintenance in Lafayette, CO | Air Conditioner Installation Boulder, CO | AC Repair Louisville, CO


Bryant HVAC LogoAs a Bryant Factory Authorized Dealer, Welzig Heating & Air consistently performs to strenuous standards of technical competence, business ethics, and customer approval.  Our team is NATE-certified, factory trained and regularly updated in progressive technology.  Equipped with leading edge equipment, tools, and a full inventory of genuine manufacturer’s replacement parts, we properly size and install new systems, accurately diagnose existing systems, and resolve the majority of issues right then and there.

Call Welzig Heating & Air for accurate HVAC repairs, service, and installations in Boulder, CO & Surrounding Areas!

By combining immediate results with sustainable performance, we protect the value of your investment.  We provide skilled installation, maintenance, and repair of gas furnaces, heat pumps, dual fuel systems, boilers, air conditioners, air quality products, traditional and tankless water heaters, and advanced duct cleaning services.  Welzig Heating & Air is the right choice for  the comfort, safety, and health of homes or offices across Boulder, Longmont, Louisville, Lafayette, CO & more.

Angie's List Super Service Award
Readers Choice Award
BBB Accredited Business

 

Neighborhood Favorite
Best of Longmont Award
Bryant Circle of Champions
Request An Estimate:

Furnace Repair ∴ HVAC Service ∴ Heating Service ∴ AC Repair ∴ AC Maintenance ∴ Louisville, CO ∴ Longmont, CO ∴ Boulder, CO

Welzig Heating & Air
March 15, 2016
2021/04/15
  • $89 Ultimate AC Tune Up

    $89 Ultimate AC Tune Up Special

    Cannot be combined with other offers. Call for full details.

  • $35 Off a Service Call

    (Does not include trip and diagnostic)

    Cannot be combined with other offers. Call for full details.

    Expires: TBD

HVAC Services Throughout Colorado

We proudly service all those in the Boulder, CO & Surrounding Areas. Call today to improve your home comfort.

View Our Service Area
Our Clients Love Us
  • "Casey, I am glad I chose your company to help with my air conditioner problem. I was a bit surprised when your workers discovered that the old duct-work was only four inches in diameter, actually, I was more depressed and concerned about how this would affect the entire job..."
    Bob
  • "Weston called me before arriving and was on time. He was not only professional but knowledgeable. He found my problem and listened to my concerns. I will refer Weston and Welzig Heating to my family and friends..."
    Dan
  • "Saul and his crew were all they needed to be! They did an install of a radiant heater in my airplane hangar. They did excellent work right down to making sure all caulking was effective and good looking. The system was tight and holding the applied pressure. Let's see if Xcel Energy can follow this quality act when they set the meter. Jimmy, David, Saul, et al thank you for the GREAT customer service."
    Jim

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We Service All Brands
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Welzig is Google Guaranteed, which means we are verified and backed by Google and that every technician that enters your home has passed a background check!
Services
  • Air Conditioning Installation
  • Heating Installation
  • Heat Pumps & Dual Fuel
  • Duct Cleaning
  • Ductless HVAC
  • Indoor Air Quality
  • Boilers
  • Tankless Water Heaters
Why Choose Welzig?
  • Emergency Services
  • Maintenance Plans
  • FAQ
  • Financing
  • Specials
  • Contact

Welzig Heating & Air
1831 Boston Ave. #D
Longmont, CO 80501
303-532-4960
Text Us: 720-600-8370
303-678-5576
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