It's time for WaterFurnace geothermal for your planned/existing home or commercial building. Make ACG, Advanced Custom Geothermal, located in Kiel, Wis., your choice for geothermal. You will get knowledge and a job sized correctly and done right. We don't guess or go by rule of thumb. We perform Manual J calculations to properly size your job.


Contact Details

  Website
  City Glenbeulah, WI
  Zip Code 53023
  Address 118 W Barrett Str
  Phone Number (920) 999-5902

From Our Website

You can count on Advanced Custom Geothermal for all your heating, cooling, and geothermal needs. Whether you are building a new home, updating your existing heating and cooling system, or require repair service Advanced Custom Geothermal is your solution for a full-service heating, cooling, and geothermal contractor. We are the #1 Water Furnace Geothermal contractor in the state of Wisconsin. Geothermal Heating & Cooling systems offer significant financial savings drastically lowering monthly heating and cooling costs, along with multiple tax incentives.


Since 2007, Advanced Custom Geothermal has been providing traditional and geothermal HVAC services to the residents of Wisconsin. Owner, Sean Steffes, helped found the company and continues to lead their team of HVAC professionals. Although geothermal is the primary focus, ACG is a full-service HVAC contractor that also installs and services gas and oil furnaces, gas fireplaces, air conditioning, and air exchangers. Call us for all your HVAC needs. Advanced Custom Geothermal has been wonderful to work with.


Advanced Custom Geothermal (ACG), is a full-service HVAC contractor. We specialize in the installation and repair of traditional HVAC systems as well as energy-saving WaterFurnace Geothermal Systems. Summer in Wisconsin can get hot and it is important to have a central air unit that is working properly and efficiently. Advanced Custom Geothermal services and installs air conditioning units and systems. We can also help improve indoor air quality including humidifiers, duct cleaning, and UV light air purifiers.