HVAC & Plumbing Services in Oconomowoc, WI

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Oconomowoc’s name is often translated as “where the waters meet,” and the city really does sit between the Oconomowoc River, Lac La Belle, and Fowler Lake. That setting brought Milwaukee and Chicago families here for summer estates more than a century ago. Today the housing ranges widely, with older homes near downtown, lake houses that were once seasonal cottages, and newer subdivisions on the edges of town. Southport handles heating, cooling, and plumbing for all of them.

Reach out today to get service scheduled at your Oconomowoc home.

Two workers shake hands outside a suburban home, with a Southport service van in the driveway behind them.

Heating & Cooling

Heating needs in Oconomowoc depend a lot on the house. Lake homes that started as summer cottages were often expanded over the years, so some rooms end up far from the furnace or on a separate system entirely. Older homes near downtown may still run on boilers and radiators, while newer homes usually have high-efficiency furnaces and central air. Summers here bring humid stretches off the water, which pushes AC systems to run long hours.

  • Rooms that never warm up in January often point to a furnace that is undersized, aging or fighting poor airflow.
  • Homes with radiators or in-floor heat can keep that comfort with boiler repair or replacement.
  • A sunroom, lake-facing addition or finished lower level is often easiest to heat and cool with a ductless mini split.
  • Weak cooling on humid July afternoons is usually worth a look from our air conditioning technicians before the next heat wave.
  • Homeowners who want to cut gas use can pair a furnace with a heat pump for milder days.

Book a heating or cooling visit before your system starts giving you trouble.

Plumbing, Water Heaters & Water Treatment

Like most of Waukesha County, Oconomowoc draws its water from groundwater wells, and that water tends to be hard. Mineral scale builds up inside water heaters, fixtures and supply lines, which shortens equipment life and leaves spots on glass and tile. Some lake homes outside city limits run on private wells, where iron and sediment can add to the hardness problem.

  • Hard water and well water problems are often solved with water treatment, including softeners and filtration.
  • Rumbling tanks or lukewarm showers usually mean scale has built up and the water heater needs service or replacement.
  • Older drain lines under homes near downtown are prone to buildup and root intrusion, which drain cleaning can clear.
  • Leaks, low pressure and fixture problems fall under our general plumbing service.

Schedule plumbing service when you first notice a slow drain or a change in your hot water.

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Why Choose Southport Plumbing, Heating & Cooling?

  • Our Caledonia location serves Oconomowoc and the rest of western Waukesha County, along with nearby Waukesha.
  • NATE-certified HVAC technicians work out of trucks stocked with common parts, so many repairs are done in one trip.
  • You get upfront pricing before work begins.
  • Southport has an A+ BBB rating and more than 2,000 local reviews.
  • Repairs come with a 100% satisfaction guarantee and 30-day coverage on parts and labor.

Get in touch today and let a team that works on Lake Country homes take care of yours.

Southport logo with blue 'SOUTHPORT' wordmark and orange 'PLUMBING • HEATING • COOLING' tagline.

$259

Furnace + Plumbing Inspection Bundle 
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Expires: 11/30/2026
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Read About Our Customers’ Recent Experiences

Teresa Kelly
2 days ago
Nate was just outstanding! So fast! So knowledgeable! So polite! We can’t wait to do business again:)
Mike Glatkowski
2 days ago
Alex is a great technician.
Andrea Hyde
3 days ago
Excellent work in installing our furnace! Finished in just three hours, and it’s running wonderfully. Walked us all through our new thermostat and how to install and use the app. Such polite technicians and kept our home tidy in the process. Would recommend Southport to anyone.
Sue N (SueN313)
3 days ago
Luke was on time, thorough, professional, and keeps you up-to-date with what’s being done. We have the maintenance program so we pay a small fee monthly and it covers the heating and ac maintenance yearly. Love this program and it works great in retirement
Jody Davis
4 days ago
Southport rocks it every single time! They hire the most knowlegeable , kind, polite, professional people!!! Another fantastic service visit
Brian Gleichauf
4 days ago
Adam was great, very professional and friendly and provided me with all the information I needed to get an estimate for mini -splits.
Cathy Johnson
4 days ago
Great service Polite and knowledgeable young man. Explanation that could be understood as to what was needed to be done with pricing for different options.
Marilyn Hammes
4 days ago
Thank You Riley and Southport Plumbing for a quick response to a very clogged toilet.
Riley arrived within minutes of the scheduled appointment and completed the work quickly and efficiently. He answered all my curious questions politely and cleaned the area completely after the work.
Lesson learned… don’t dump your cleaning water down the toilet with the sponges and rags you used!!!
Eric Hensley
5 days ago
I had a boiler system installed by Southport and everyone I interacted with was fantastic! After several quotes I selected them because I thought the company had a lot of integrity. I first got a quote from Caleb who was most professional, walking me through all the options they had for me and being very reasonable on the pricing. They scheduled the installation within a week and, on that day, the technicians Ryan and Jacob were excellent and very hard workers. I appreciated that they were very careful inside the house, putting shoe protectors while upstairs and overall being very respectful. They stayed until the job was done and my heat was restored. I would highly recommend Southport if you need a new boiler installation or and work or maintenance on your boiler, home heat, or water heating system.
Dave Frook
6 days ago
Justin did a great job explaining everything to us. He is very knowledgeable.
Mario Maritato
6 days ago
Timely, professional and friendly service.
David Geertsen
6 days ago
Southport did a good job, Justin was professional, thorough, did a great job !!
Darlene Severson
7 days ago
Thank you for sending Andrew Wenk to test our furnace. He could answer our questions clearly and tested all the important components and measured various pressures, temperatures, speeds, and other technical factors. He gave us 3 estimates for replacing parts that are needed due to age of the furnace. Andrew was pleasant and respectful to us.
JULIE GRIMM
1 week ago
Great technician. Grest communication and friendly. Jacob.
chris kwong
1 week ago
Jacob came over to install a new heat pump and do an annual HVAC maintenance check for winter. Appreciate how Jacob was friendly, communicative on progress/steps/etc, and open for questions!
Jackson ellis
1 week ago
Vincent came and assessed my furnace and was very helpful with diagnosing problems with it. Would definitely recommend them for any needs
Jackie Lambert
1 week ago
Fast and friendly. Thanks for getting my heat back on!
Karen Parrillo
1 week ago
Blake was very courteous and efficient in disconnecting our old dryer gas supply. We appreciate the quick response.