The Professional Choice
for 40+ Years

Who We Are

Need an HVAC contractor? Johnson Mechanical is considered our community’s clear option for comprehensive heating and cooling solutions. With nearly half a century’s worth of industry experience and an excellent reputation, Johnson Mechanical, LLC is committed to never letting customers down.

Whether you’re a homeowner or a business owner, seek HVAC repair or installation services, are interested in investing in home automation or an indoor air quality system, you can be assured that you’ll receive the best service in town.

Founded in Portage, WI, we’re available to assist customers throughout Baraboo and Wisconsin Dells.

Commercial HVAC Services - Portage, WI
A broken HVAC system can considerably interfere with your quality of life — don’t let it

Meet Bob Marquardt

Owner of Johnson Mechanical, LLC

Bob Marquardt, owner & founder of Johnson Mechanicals in Portage, WI
I am a graduate from the University of Wisconsin Platteville with a Bachelor of Science degree in Building construction Management in May of 1988. I started my Career in the HVAC industry in the fall of that year as an estimator/ project manager for a Commercial HVAC company.

The company I was working for did plan and spec and design build HVAC projects where I was working with outside engineers to go design the projects that we were working on. With some additional engineering classes that I took and the experience of doing design build projects I was able to take my designers license for HVAC and have held that license in good standing since 1997.

I continued in the industry since that time working in the Madison Market as a design build project manager from that time forward specializing in Industrial, health care clinics and clean rooms design build projects.

In 2015 when Johnson Mechanical became available for purchase, I decided to buy in with my business partner Vernon Carlson who was a technician that has worked with Johnson Mechanical for 20 plus years and has been a friend for over 20 years. I have been enjoying working in the residential and light commercial industry it is more customer oriented and rewarding to help my clients out directly.

“Went above and beyond! [Systems are] up and running and working amazing! Will be using them for all future repairs and replacements!”

“Our tech was A+. His knowledge and workmanship were spot on. As he was working he was educating us on all he did and how to take care of our equipment.”

Ready to upgrade your HVAC system? Johnson Mechanical offers a wide range of products for both residential & commercial customers.

Call 608-742-HEAT (4328) for more information.

Johnson Mechanical, LLC

2601 Portage Road
Portage, WI 53901

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Serving Portage, Wisconsin Dells, & Baraboo

Business Hours:

Monday — Friday
7:00 AM to 4:30 PM

24/7 Emergency Service

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