Johnson Mechanical, LLC

is the professional choice

Johnson Mechanical, LLC

is the professional choice

Johnson Mechanical, LLC

is the professional choice

Year-Round Efficiency & Comfort

There’s never a convenient time for your HVAC systems to start giving you concerns. But when you choose Johnson Mechanical, LLC as your heating and cooling company, you can be assured that you’ll receive prompt, professional service whenever a problem arises — even if it occurs during the middle of the night.

As a distinguished, A+ rated BBB business, we provide residential and commercial HVAC capabilities within a 45-mile radius of our hometown of Portage, WI, and are happy to help our friends and neighbors in Wisconsin Dells and Baraboo.

Two outdoor HVAC units sitting on concrete slabs over mulch and behind green bushes under a window
Heat not making its way to you? A/C making strange noises? Want to experience the benefits of a healthy air system?

Johnson Mechanical, LLC is at your service.

Optimal Conditions, No Matter the Season

Johnson Mechanical, LLC delivers a comprehensive range of installation and repair capabilities to ensure customers are comfortable in their environments.


When it’s a simmering summer, nothing feels worse than being at home, breathing humid air, and praying for a slight breeze. We’ll ensure cold and comfortable air circulates throughout your space as it should.

Keep Cool


We understand how unbearable Wisconsin winters can be. Allow our team to help with your system so you can feel cozy and relaxed at home without having to wear puffy coats and mittens indoors.

Stay Warm

Healthy Air

Now more than ever, it’s essential to ensure the air we breathe is quality and free of bacteria. Johnson Mechanical, LLC provides healthy air systems to ensure your family is safe, happy, and healthy.

Healthy Air Systems

Setting You Up with the Right Solution

We’re proud to provide top of the line Rheem® products, home automation systems, and custom units. Whatever your needs, we’re dedicated to delivering an exceptional customer service experience.

Some Questions You May Have

Can I count on Johnson Mechanical, LLC in the event of an emergency?

Yes. Heating and cooling systems are known to give us trouble in the worst possible moment. When an emergency occurs, you can have peace of mind knowing Johnson Mechanical provides round-the-clock emergency services.

Do you offer financing options?

Yes. HVAC systems can be pricey, and cost shouldn’t be a barrier when you urgently need a new unit. We work with Synchrony to provide customer-oriented financing solutions. To apply for financing, click the button below!

Are home automation systems available?

Yes. Johnson Mechanical, LLC specializes in home automation technology. We can help hook you up with a smart thermostat that provides convenience and lowers your energy costs.

“I’m so pleased that I found Johnson Mechanical! very friendly, punctual and had great communication. The pricing was fair for the great service they did. Good people, I would highly recommend them.”

“We just had a new furnace and central air put in. Very pleased with how smoothly everything went.”

If you’re in need of an HVAC contractor near Portage, Baraboo, or Wisconsin Dells, Johnson Mechanical, LLC is happy to help.

Contact us today for quick, quality service.

Join Our Team! We’re Hiring!

Johnson Mechanical is currently working to grow our team to better serve our customers. We are hiring for three positions – 

HVAC Level 1 Installer

HVAC Technician

We are looking for employees that can help us live up to our motto “The professional choice”. Our owners Robert Marquardt and Vernon Carlson each have 30 plus years of experience in the industry. Our success is directly related to our team of employees. We encourage our team to be the best in our industry and community. It’s not just doing the job and making it work it’s the little things that matter. Customer relationships are key! Be courteous, clean up after yourself and make sure the owners are comfortable with their new systems and know how to operate them.

If you are interested in applying, please give us a call today or email your resume to

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

Rheem - Johnson Mechanical - Portage, WI Aprilaire - Johnson Mechanical - Portage, WI