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TRUSTED BY OCONOMOWOC, WI HOMEOWNERS

  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon323
    Verified heating and air conditioning services reviews

Top-Rated Heating and air conditioning pros in Oconomowoc - Updated Nov 2026

Avatar for Droegkamp Furnace Co
Droegkamp Furnace Co
4.8(
575
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - Repair+27 more

Serving Oconomowoc, WI and surrounding areas

Approved

In business since 1877

Free estimates

Emergency services offered

"Two visits and that's not our fault: Brian came, diagnosed the problem (capacitor if not blower died, and tune up). He was right: a new capacitor made it work well, until the old blower just refused to obey. Two days later we called and said that Brian was right: the blower needed replacement. Doing just the capacitor was our call to try to save money. Now our 20+ year old furnace runs like new. And I'll be calling them to replace our HVAC ('cuz it's 20+ years old) when it decides to give up the ghost."
Response time1 day
Response rate99%
15 neighbors recently requested a quote
Cardinal Heating & Air Conditioning
4.8(
165
)
Air Ducts & Vents - CleanDucts & Vents - Install or ReplaceCentral A/C - Install+9 more

Serving Oconomowoc, WI and surrounding areas

Approved

In business since 1984

Free estimates

Credit card accepted

Cardinal Heating, Cooling, Plumbing & Electric has provided full-service HVAC, plumbing, and electrical work to homes and businesses throughout the Madison area since 1984. Homeowners call us for furnace and air conditioner repair, water heater replacement, drain cleaning, and electrical panel upgrades, along with the everyday plumbing and electrical work every home needs. We take the time to listen to every customer and explain the options clearly, and our licensed technicians bring years of hands-on experience to routine maintenance, unexpected repairs, and full system installations alike. Call Cardinal today to schedule your free estimate.

Cardinal Heating & Air
Cardinal Heating & Air
Cardinal Heating & Air
Cardinal Heating & Air
Cardinal Heating & Air

+15

14 neighbors recently requested a quote
Recommended by91%of homeowners
Avatar for Southport Plumbing, Heating & Cooling
Southport Plumbing, Heating & Cooling
5.0(
14
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallDuctless Mini-split A/C - Install or Replace+7 more

Serving Oconomowoc, WI and surrounding areas

Approved

In business since 2005

Free estimates

Warranties offered

"Very pleased with our new air conditioner installation. The salesman was very nice and explained everything to my satisfaction. The installers were efficient and knowledgeable as well. They showed up exactly on time and were finished earlier than I expected. Work areas were cleaned up, inside and out. Not even any metal shavings in the grass where the new ducting was cut. One of the nice gentlemen even explained the new thermostat they installed. I highly recommend Southport Home Services."
Air Conditioner
Furnace System
Outdoor Heat Pump
Garage Heat Pump
Furnace Install

+2

20 neighbors recently requested a quote
Avatar for Guardian Heating and Cooling, LLC
Guardian Heating and Cooling, LLC
4.7(
82
)
Gas Boiler or Radiator Heating System - InstallRadiant Floor Heating System - InstallGas Boiler or Radiator Heating System - Install - For Business+2 more

Serving Oconomowoc, WI and surrounding areas

Approved

In business since 1998

Free estimates

Warranties offered

"The owner of Guardian Heating and Cooling, LLC (Steve Peterson) and one of his sons (Adam) did an AWESOME job installing a new, high-efficiency, gas-fired Laars combi-boiler at my residence! If the new unit continues to perform as well as it is presently, and Guardian service continues to be this excellent in the years ahead, I will be a happy camper and pat myself on the back for having been smart enough to hire them. :-) The unit they replaced was built by a highly-regarded manufacturer that had been installed by another highly regarded contractor by the previous owners of my home. As it turned out, the previous heating unit was a money pit and the previous contractors technical abilities left much to be desired. Each heating season, the previous boiler experienced one significant failure after another. The previous contractor kept changing parts without digging into **why** the parts were failing. They simply said I should accept this, since the unit was **old**. Unhappy with this response, I decided to cut my losses. To the rescue: Guardian Heating and Cooling! While not the least expensive contractor, Steve, and Son exceeded my expectations simply by meeting them! They arrived one time and did everything they said they were going to do. With unseasonably cold weather in October, I was initially a bit apprehensive at the prospect of having no heat for a few days while a replacement system was installed. I wondered if they would be able to complete this project in a timely manner, as they said they would. My worries were for naught. There were no surprises and no surprise expenses ... no nickle-and-diming when Guardian needed an extra part or fitting ... no drama. Guardian simply got the job done. And they did it beautifully. They took care to minimize the time I would be without water and without heat. After installation, they thoroughly tested the unit. The next day, they checked back to ensure that I was satisfied with its performance. They also cleaned up reasonably when they were done and were carefully not to damage my property, as they moved large, heavy pieces of equipment and tools around. In summary: a big Thumbs Up for Guardian heating and Cooling, LLC!"
Boilers
Boilers
Boilers
Garage infloor
Sun Room

+4

Response time7 hrs
12 neighbors recently requested a quote
Recommended by100%of homeowners
Avatar for Due North Heating & Cooling, LLC
Due North Heating & Cooling, LLC
5.0(
15
)
Gas Furnace / Forced Air Heating System - InstallGas Furnace / Forced Air Heating System - Install - For Business

Serving Oconomowoc, WI and surrounding areas

Approved

In business since 2020

Free estimates

Emergency services offered

"Quick personal response to my initial request. All other vendors responded with generic email, or automated call/voicemail. Josh was to the point, yet personable. He arrived with Kevin and took care of my situation in a fast and professional manner. Felt very comfortable during the entire process! Do your self a favor and call Josh for all your HVAC ne"
Furnace Replacement
Furnace Replacement
Furnace Replacement
Due North Heating & Cooling LLC
Due North

+1

Response time3 hrs
Recommended by100%of homeowners
Avatar for Countryside Heating and Cooling, LLC
Countryside Heating and Cooling, LLC
5.0(
7
)
Gas Furnace / Forced Air Heating System - InstallCentral A/C - InstallCentral A/C - Service or Repair+12 more

Serving Oconomowoc, WI and surrounding areas

Approved

In business since 2024

Free estimates

Emergency services offered

"Shane was able to schedule a prompt appointment. He arrived on time and performed a thorough diagnostic on the furnace. He identified an issue I was unaware of and corrected the problem with the air conditioner using parts that were still under warranty. I will gladly use his services again."
Heating the Dream Barn
Heating the Dream Barn
Heating the Dream Barn
2024 Nextdoor Fave Award
2024 Nextdoor Fave Award

+2

Response time1 day
6 neighbors recently requested a quote
Avatar for Napravnik Construction, LLC
Napravnik Construction, LLC
4.8(
66
)
Thermostat - Install or Replace

Serving Oconomowoc, WI and surrounding areas

Approved

Super Service Award Winner

In business since 1998

Free estimates

Emergency services offered

"Hired to install new smoke detectors, door handles and locks. The owner showed up on time, honored the quote provided the day before and was professional and genial throughout. Will definitely hire again."
French Kitchen
Custom Homes
Room Additions
Modern flare
Custom Garages

+4

Response time1 day
50 neighbors recently requested a quote
Recommended by85%of homeowners
Avatar for Over the Moon Heating, Air & Electric
Over the Moon Heating, Air & Electric
3.6(
15
)
Air Ducts & Vents - CleanDucts & Vents - Install or ReplaceGas Furnace / Forced Air Heating System - Repair+5 more

Serving Oconomowoc, WI and surrounding areas

Approved

In business since 2009

Emergency services offered

Warranties offered

"Had them out to complete a duct cleaning for my home and they were very throughout and very friendly to all members of my family including working with having pets in the home. fairly priced for the high level of service provided"
Team & Job Photos
Team & Job Photos
Team & Job Photos
Team & Job Photos
Team & Job Photos

+51

Response time4 hrs
84 neighbors recently requested a quote
Recommended by54%of homeowners
...
Showing 1-10 of 156
Heating and Air Conditioning FAQs, answered by experts

On average, an AC unit lasts between 10 and 20 years. However, the specific lifespan depends on the type of unit, how often it's used, the local climate, and the quality of maintenance. Central AC units typically last 12 to 17 years, while window units have a shorter lifespan of 8 to 10 years. Portable AC units last about 5 to 10 years, and ductless mini-split systems can last up to 20 years. To extend the life of your AC unit, it's important to perform regular maintenance, such as replacing filters, cleaning coils, and scheduling annual professional tune-ups.

It depends on the type of AC unit and the extent of the mold growth. For example, if you have a small amount of mold in your central air conditioner, it’s worth cleaning it to protect your HVAC system and your health. In situations like these, you can often remove the mold yourself in a couple of hours. On the other hand, if you have a portable AC unit with a severe mold problem, it makes more sense to buy a new one. On average, replacing a portable AC unit costs $100 to $500.

They can, but it’s not as common. Window AC units are much smaller than whole-house systems and less likely to develop refrigerant leaks or similar issues. As a result, you will rarely need to add a new refrigerant, limiting overcharging problems. However, it’s still important to leave refrigerant management in the hands of professionals when window units need work.

To find a reputable HVAC company, start by researching providers in your area. Look for companies with mostly positive online reviews and check the Better Business Bureau’s website for customer complaints. Next, verify their credentials. Rule out any companies that aren’t licensed, as this is a requirement in some states and municipalities, and confirm they are insured. Once you have a shortlist, contact each professional to ask key questions: How many years of experience do you have? Do you hold any third-party certifications? Do you have experience working on my specific type of HVAC system or brand? Can you provide references? What is your per-hour pricing? Do you offer maintenance contracts for ongoing savings? Do you provide a warranty for your work?

No. Your furnace does not run your air conditioner. Both units use the same system of ductwork to move conditioned air throughout your home, but you can have a furnace without having an air conditioner and vice versa. Furnaces are only for heating your home. You can buy a system that does both, however, like a split system or a heat pump (yes, heat pumps cool, too).

The Oconomowoc, WI homeowners’ guide to heating and air conditioning services

From average costs to expert advice, get all the answers you need to get your job done.