Partial orange curved logo on a black background.
Commercial
Dependable
By Design
Looking for commercial or industrial mechanical services in Wisconsin? Count on Southport Mechanical for highly professional results.
Blue panel van with 'Southport Mechanical' branding, lighthouse icon, and 'Dependable by Design' slogan on its side.

Industries We Serve

Industrial
Manufacturing Facilities
Educational Facilities
Government Facilities
Healthcare Facilities
Nursing/Assisted Living Facilities
Multi Family and Hotels
Business and Retail Facilities
Warehousing and Storage Facilities
Our Services

We Are There
When You Need Us

We assemble a versatile team of professionals equipped with the knowledge necessary to accomplish tasks effectively.
Southport Mechanical logo: blue 'SOUTHPORT' wordmark above orange 'MECHANICAL' letters with a curved orange accent on the left.
About Us

Engineered Systems Built for Performance

Southport Mechanical has delivered expert HVAC, plumbing, and fire protection solutions across Southeastern Wisconsin since 2005, now serving the Madison and Wausau regions. Backed by over a century of combined experience, we’ve grown into a full-service design-build firm with a 45,000 sq. ft. facility and in-house fabrication capabilities.

From commercial and industrial systems to residential projects, we provide efficient, high-performance solutions tailored to your building, helping you achieve reliability, comfort, and long-term value.

Schedue a Consultation Today

Ready to take the next step toward a more efficient and comfortable property?

Our Completed Projects

Siena on the Lake

Siena Center is a multiyear, multi-phased, renovation of a senior community originating from an ecumenical partnership between the Racine Dominicans and Lincoln Lutheran of Racine. On the shore overlooking Lake Michigan, the project consisted of multiple facilities. Phase 1 consisted of 70 retreat center rooms with conference and retreat space. In addition, there are 64 new residences for the Sisters along with 4 guest rooms. Phase 2 consisted of 32 skilled nursing rooms, 16 skilled rehabilitation rooms, physical and occupational therapy space along with a wellness clinic.

Dickson Hollow

Dickson Hollow is a one-of-a-kind assisted living facility located in Menomonee Falls, WI. This project features 4-story wood, 120-unit senior apartment building. Two Story town center along with an underground garage. A three-story, 60-unit assisted living and memory care apartment building of steel framing. The approximate size is 300,000 square feet of new construction that feature 180 new units.

Springs of Kenosha, WI

Complete plumbing for over 180 two- and three-story residential buildings featuring studios, one-, two- and three-bedroom configurations with contemporary appliances and finishes. The Springs properties also offer fully-featured community clubhouses including fitness centers, meeting and business centers, outdoor pools and gathering spaces.

Olympia Brown Science School in Racine, WI

A one-story, 67,500 square-foot elementary school in Racine County that serves Pre-K through 5th grade with 20 general classrooms and 8 specialty teaching spaces. Located near the shores of Lake Michigan, the school was designed to be a science-focused school where students will get hands-on learning experiences to better prepare them for careers of the future.

Sun Prairie Public Library

Sun Prairie Public Library in Sun Prairie Wisconsin. We are currently installing the plumbing and HVAC of a renovation and a 25,000 square foot addition to the existing library. The renovation portion of the job is projected to begin summer of 2025.

Lake View Technology Academy

We completed the HVAC install of this brand new 48,000 square foot school that specializes in STEM fields and trades education.  We prefabricated the majority of the ductwork as well as the controls for the VAV boxes on this job.

Woodman’s Racine

Woodman’s Racine in Racine Wisconsin.  We are currently installing the HVAC for a brand new 250,000 square foot Woodman’s going up in Racine, Wisconsin. We prefabricated both the spiral and rectangular ductwork.

West Allis DPW

We are currently installing the plumbing and HVAC on a 175,000 square foot brand new municipal building.  We ran BIM coordination for the job resulting in many conflicts between trades alleviated prior to installation.

Summer Ridge Apartments

We completed the design and install of both plumbing and HVAC for a new apartment complex consisting of eight 2-story stacked flats.  We prefabricated all of the underground sanitary piping for this project.

    Affiliations

    Award-Winning Service
    & Proud Partnerships

    Our NATE-certified HVAC team provides heating and cooling system services with one-stop repairs from a fully loaded warehouse on wheels, and skilled diagnostic services to target problems quickly. We can also help when it's time for HVAC system replacement or installation for new construction with a carefully selected and sized system that meets your needs and budget. Whether it's snowing, raining, or a hot summer day, we can make sure that your home is a haven!
    Poster for Top Work Places 2026 with a yellow shield on a dark blue background and 'journal sentinel' at the bottom; midsize business category stated at the bottom edge.
    Why Choose Us

    The Southport Difference

    Certified Excellence

    With an A+ BBB rating and over 2,000 local reviews, we are built on trust and proudly deliver with precision and care.

    Expert Technicians

    Our NATE-certified HVAC team offers fast heating and cooling repairs with a fully stocked mobile warehouse and expert diagnostics.

    Upfront Pricing

    Transparent, detailed estimates provides before work begins. No hidden fees, just honesty in our business practices.

    Locally Owned

    Proudly serving Southeast Wisconsin, combining climate expertise with a personal touch for every home.

    Guaranteed Quality

    We stand behind every weld, wire, and bolt. If it's not perfect, we return to make it right – guaranteed.

    100% Satisfaction

    All our systems come with a 100% satisfaction guarantee, plus 30-day coverage on all repairs, parts, and labor.

    Read About Our Customers’ Recent Experiences

    Poonam Patel
    4 days ago
    Caleb was professional and super helpful. He expediated a plan for our leak in an extremely timely manner. The techs were efficient and explained things well. Highly recommend!
    Nancy Patin
    4 days ago
    Wow , my service was amazing. Ryan , Quinn and Oliver were the best. They work so hard and are so respectful. The salesperson Caleb was great. He made everything happen so smoothly. Southport was the way to go. I’m a very happy customer.
    Paul Fennema
    5 days ago
    They arrived as scheduled. Took care of maintenance needs. Did a great evaluation of the system and presented options for system needs. Very personable guys. Very pleased with their service.
    Sarah Semrad
    1 week ago
    Ryan, Quinn, and Oliver were wonderful. They made sure I understood everything that was happening and I am very happy with the product.
    Susan Donovan
    1 week ago
    Nice and friendly took care of my AC tuneup in a timely matter and we’re on time
    Jacob Hardy
    2 weeks ago
    Every step was very professional, informative, and down to earth. The team was fast and clean. They got me up and running in an extremely timely manner. I highly recommend this company!
    Nancy Patin
    2 weeks ago
    Wow , my service was amazing. Ryan , Quinn and Oliver were the best. They work so hard and are so respectful. The salesperson Caleb was great. He made everything happen so smoothly. Southport was the way to go. I’m a very happy customer.
    Jaclyn Wolff
    2 weeks ago
    Travis was awesome, I called on Tuesday afternoon and the issue was fixed by 11am Wednesday morning.
    Just Me
    2 weeks ago
    From the time my call to replace my water heater was answered to the time their service van pulled away Southport was responsive and courteous. Henry and Riley were fantastic! They explained every step and answered every question we had. I enthusiastically recommend Southport.
    Nancy Wedge
    3 weeks ago
    Had an emergency and they were able to get there within a half hour on a Friday night!
    LL K
    3 weeks ago
    Andrew & Grant did an excellent job installing our water softener system, they were very efficient and the process to book through sales was excellent! I highly recommend working with Southport for all your heating and cooling needs!!
    Courtney B
    3 weeks ago
    Southport was super easy to work with and get appointments scheduled. We have used them multiple times and each time they give fair quotes, good information, timely, and professional. Everything they have helped with has not had any issues and is done with great quality of work. Highly recommend them for your plumbing needs.
    JENNIFER MCKAY
    3 weeks ago
    My experience was great. I appreciate the estimate and how it was explained to me.
    William Raciti
    3 weeks ago
    Very professional and clean.
    Jack
    3 weeks ago
    Very quick and professional installation of a new AC unit. Worked with some of my personal reqests which made for a great install.
    Brian Childers
    3 weeks ago
    I have a Shield maintenance agreement with Southport Plumbing Heading and Cooling.

    The value for the plan is fantastic! They come out and help maintain your plumbing, heating and cooling systems. Jacob from the HVAC side has come out to my home and has done an excellent job of keeping me aware of what is working well, and what I may need to keep an eye on.

    Justan and Nathan from the plumbing side have also come out to my house and did the regular yearly maintenance. They too, do an awesome job of keeping me updated on how the plumbing is within my house.

    I also was alerted to the battery being bad for my sump pump backup system and Justan and Nathan installed a new sump pump and a new backup system as well. The timing was impeccable as we faced a power loss for around 24 hours, and the battery was fully charged and the backup sump pump worked while we didn't have power! It was better paying for the backup system than a repair bill for a flooded basement.

    To round it out, the office staff, Sarah did a great job helping me coordinate not only the visits for the maintenance, but also helped facilitate the installation of the plumbing work.

    They keep giving great reasons why I'm a long term Southport Plumbing, Heating & Cooling customer!

    Thank you!
    Kate Cahill
    3 weeks ago
    Highly recommend for your HVAC needs! The salesman that came out to do the quote was professional and informative. The installers were incredible! Everyone was on time and on budget. Highly recommend! 10 out of 10 stars
    sonam raptenpa
    3 weeks ago
    I am very satisfied with their service and products, they really did good job for installing new A/C this hot summer. The cost was reasonable and I am very happy with it, so thank you so much
    Map of southern Wisconsin with orange pins marking multiple towns and cities (Madison highlighted) including Milwaukee, Janesville, Kenosha, Watertown, Baraboo, Wisconsin Dells, Oak Creek, Caledonia, Stoughton, Waunakee, and more.
    Service Area

    Areas We Proudly Serve

    From Caledonia to Madison to Wausau, we proudly serve homeowners throughout Greater Wisconsin with reliable plumbing, heating, and cooling services you can count on.

    Schedule Service For Your Home Or Business Today!

    Are you looking for great HVAC and plumbing services? Our Southport team serves you with quality plumbing, heating and cooling services in Milwaukee and the surrounding areas. Contact us today!