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An unnoticed leak or any concerns with any aspect of the plumbing system can lead to higher water bills, structural damage, mess, and disruption. Whether you suspect or are sure of an issue, contact Welzig Heating and Air to schedule a prompt appointment with our experienced and highly-skilled plumbers. Continuing 30 years of service in Boulder, CO and surrounding areas, we uphold satisfaction guaranteed on every job.

Plumbing Repair with Satisfaction Guaranteed

Sewer leaks, dripping faucets, endlessly running toilets, no hot water, slow-moving drains, and a flooded basement are no problem for Welzig Heating and Air. We arrive on time, prepared, and determined to provide a smooth, swift process and successful, sustainable solution. Rest assured, we don’t add to the mess or settle for a quick fix that won’t hold up. Family-owned and operated, we’ve earned our reputation for quality by always delivering the best possible value.

Don’t Let Your Plumbing Repairs Wait!

Welzig Heating and Air offers the expertise and innovative equipment for accurate leak detection, and we have experience with every kind of plumbing malfunction imaginable. We will explain our findings and outline the most advantageous options for repair. Handling residential and light commercial plumbing complaints, we stick to exacting protocols for service and utilize only premier parts, materials, and products. While our strategies are cost-effective, we never compromise integrity. Get in touch at (720) 336-3777 anytime 24/7 for plumbing repair anywhere across Boulder, Longmont, Louisville, and Lafayette, CO.

Satisfied Customers
They Speak For Us

Our 23-year-old A/C system ran out of “borrowed time” and became too difficult to continue maintaining. With great advice from Casey Welzig,, we replaced the old system with a Bryant Evolution A/C system. Max Loustaunau and Seth Bernhardt did an excellent job with removing the old system and installing the new one. Both of them are great to work with — very professional and very personable. We are really amazed at how much better the new system works!


Bob came out to look at our swamp cooler and was remarkably helpful and professional. Not only did he give me a knowledgeable diagnosis, but he also taught me a lot in the process. We’ll be calling him for all future needs with our cooling system.


Dave Kaplan-Gomez and James Miltersen installed my new Tankless Water Heater. Both were polite and professional. Care was taken not to damage anything in my house which I really appreciated. I use Welzig for all my HVAC needs and highly recommend them.

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