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TRUSTED BY SULLIVAN, WI HOMEOWNERS

  • Average homeowner rating star icon4.7
    Average homeowner rating
  • Verified reviews icon202
    Verified heating and air conditioning services reviews

Find Heating and air conditioning pros in Sullivan

Avatar for Capital Heating & Cooling
Capital Heating & Cooling
4.2(
197
)
Air Ducts & Vents - Clean

Serving Sullivan, WI and surrounding areas

Approved

In business since 2001

Free estimates

Emergency services offered

"I was provided the fully modulating high efficient furnace solution that I wanted and received a profession installation within one week of purchase. 60-month, zero interest financing was also offered that made the decision easy. I would highly recommend Capital Heating and Cooling for your residential HVAC needs."
Dirty furnace fliter
AC Repair in Brookfield
AC Replacement
Geothermal Heating System Installed
Capital HVAC Geothermal installer

+34

Response time10 mins
165 neighbors recently requested a quote
Recommended by86%of homeowners
Avatar for KETTLE MORAINE HEATING & AIR CONDITIONING LLC
KETTLE MORAINE HEATING & AIR CONDITIONING LLC
4.8(
228
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallBoiler or Radiator Heating System - Install or Replace+47 more

Serving Sullivan, WI and surrounding areas

Approved

In business since 1987

Free estimates

Emergency services offered

"I've been using Kettle Moraine Heating for my annual furnace and AC tune-ups for a while now, and I couldn't be happier with the service. Khamya Little was professional, thorough, and took the time to make sure everything was running perfectly. It's always a relief knowing my heating and cooling systems are in great hands. The team at Kettle Moraine consistently delivers top-notch service, they're prompt, knowledgeable, and genuinely care about doing the job right. Highly recommend them to any homeowner looking for reliable HVAC maintenance!"
Radiant In floor Heating
Furnace Replacement with Humidifier
Additional Photos
Additional Photos
Additional Photos

+8

Response time2 days
Response rate100%
10 neighbors recently requested a quote
Avatar for Southport Home Services
Southport Home Services
5.0(
11
)
Central A/C - InstallGas Furnace / Forced Air Heating System - InstallCentral A/C - Service or Repair+10 more

Serving Sullivan, WI and surrounding areas

Approved

In business since 2005

Free estimates

Emergency services offered

"Justin took care to not over sell me. Only what I needed and understood. The install team were tidy, efficient, and educated me about the safety approaches when changing the humidifier filter. That filter and the furnace filter are the same that was used on my old system. They were professional and personable."
Boiler
Upstairs Furnace
Lineset/Electrical
Basement Furnace
Air Conditioner

+11

25 neighbors recently requested a quote
Avatar for Over the Moon Heating, Air & Electric
Over the Moon Heating, Air & Electric
3.6(
15
)
Central A/C - InstallCentral A/C - Service or RepairAir Ducts & Vents - Clean+5 more

Serving Sullivan, WI and surrounding areas

Approved

In business since 2009

Emergency services offered

Warranties offered

"I had the Team out to perform and AC service and Furnace tune up. With such great service and comparable pricing I ended up moving forward with duct cleaning services. The guys were friendly and professional they were also nice to my doberman."
Team & Job Photos
Team & Job Photos
Team & Job Photos
Team & Job Photos
Team & Job Photos

+51

Response time4 hrs
88 neighbors recently requested a quote
Recommended by54%of homeowners
KC Cleaning Crew
New to Angi
Air Ducts & Vents - Clean

Serving Sullivan, WI and surrounding areas

Approved

Offers commercial services

At KC Cleaning Crew, we specialize in post construction cleaning and general cleaning that gets your space ready for the spotlight — whether it's a grand opening, new office launch, or a freshly renovated property. We know the final step before opening your doors is making sure everything is spotless, safe, and presentation-ready. That’s where we come in.\n\nAs a proud local business, we’re more than just a cleaning crew — we’re part of the community. We’re committed to supporting other local businesses by providing reliable, detailed cleaning services that help you shine from day one.\n\nFrom dust to debris, we handle the mess so you can focus. We work with you to ensure all your cleaning needs are met with quality and in a timely manner. \n\nClean space and Clean start\n

Three cousins cleaning
New to Angi
Air Ducts & Vents - Clean

Serving Sullivan, WI and surrounding areas

Approved

Three Cousins Cleaning is a family business run by three cousins who are also hardworking moms. We know firsthand how important it is to have a clean and healthy space for your family and your workplace.\n\nWe bring years of experience, strong work ethic, and attention to detail to every job. Our team is reliable, trustworthy, and flexible to fit your schedule. Whether it’s your home or your business, we clean with care and pride.\n\nWhen you choose Three Cousins Cleaning, you’re choosing family, honesty, and quality service.

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Heating and Air Conditioning questions, answered by experts

Yes, mini-split systems are generally less expensive to run than central air conditioners and are significantly more energy-efficient. Because mini-splits do not rely on ductwork, they avoid the energy loss associated with ducted systems, allowing cooled or heated air to reach its destination more efficiently. Additionally, they offer zoned control, meaning you can run units in individual rooms and turn them off in unoccupied areas. This capability can lead to energy savings of about 30% compared to a central air system, resulting in a lower monthly energy bill.

You may never need an AC recharge if there are no leaks. However, if your AC unit has a leak that cannot be patched appropriately, you’ll need an AC recharge every time the freon level drops low enough that it disrupts your system—this could be once every two to three years. It all depends on the size and frequency of the leak.

Keeping your air filter clean is crucial for your heat pump's efficiency. As a general rule, you should check your air filter every 1 to 3 months. However, the actual frequency might vary depending on factors like the type of filter, indoor air quality, and the amount of dust and debris in your area. If you notice the filter is visibly dirty or clogged, it's a clear sign it needs attention sooner. Regular filter maintenance ensures proper airflow and helps your heat pump perform optimally, keeping your indoor air fresh and comfortable.

If your HVAC system's capacity doesn't match the required CFM (Cubic Feet per Minute), imbalances can occur. An undersized system struggles to maintain desired temperatures, leading to discomfort. An oversized system might short-cycle, wasting energy and causing temperature fluctuations. Properly matching capacity to CFM ensures efficient and consistent heating, cooling, and home ventilation system performance.

The top reason to purchase an HVAC maintenance contract is the fact that it ensures you are detecting problems before they turn into expensive fixes. Secondly, this type of contract provides priority service, which is nice if it’s peak busy season. Finally, an HVAC maintenance contract provides discounts on parts and labor for repairs, which can save you a good amount of money if your unit breaks.

The Sullivan, 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.