About ACG

Our 4200-square-foot facility is equipped with a
WaterFurnace Synergy 3D multi-function heat pump.

ACG, Advanced Custom Geothermal, is located in Kiel, Wisconsin. Owners Dan Walsdorf and Sean Steffes offer more than 27 years of combined HVAC/R experience. Dan and Sean joined forces on Oct. 1, 2007, combining Walsdorf Heating and Cooling LLC and Advanced Custom Air LLC.

Dan Walsdorf, left, and Sean Steffes are partners in Advanced Custom Geothermal LLC.ACG was co-founded in 2007 by Dan Walsdorf, left,
and Sean Steffes. In 2017, Walsdorf
passed on the ownership to Steffes
but remains on the board, performing all of
the duties he has in the past.

ACG is a member of the Wisconsin Geothermal Association and a member of the Mid-Shores Home Builders Association. We are partners with Focus on Energy, ENERGY STAR and Alliant Energies and a Better Business Bureau Accredited Business.

Not only do we believe in geothermal, we use it for our WaterFurnacehomes and business. In late 2008, we opened a new 4200-square-foot facility, equipped with a WaterFurnace Synergy 3D multi-function heat pump that heats water for radiant applications as well as heating and cooling with forced air.

We’d love to have you visit to see it in operation and to learn more about how geothermal will work for you — at home or at work.

What kind of expertise do we offer?

Dan Walsdorf

  • President of the Wisconsin Geothermal Association Board of Directors
  • holds the Wisconsin HVAC qualifier credential
  • is certified by NATE, North American Technical Excellence Inc,., the leading independent, third-party, non-profit certification program for technicians in the HVAC/R industry. NATE-certified technicians are skilled professionals who have proven their knowledge in the HVACR industry by passing specialized NATE certification tests.
  • is an Accredited Installer by the International Ground Source Heat Pump Association
  • has Environmental Protection Agency (EPA) universal certification
  • is fusion certified for geothermal loops
  • received WaterFurnace service and installation training
  • has Environmental Protection Agency (EPA) universal certification

Sean Steffes

  • holds a degree in HVAC/Refrigeration from University Technical Institute, Chicago
  • is an Accredited Installer by the International Ground Source Heat Pump Association
  • heads up the boring operation
  • has Environmental Protection Agency (EPA) universal certification
  • is fusion certified for geothermal loops
  • received WaterFurnace service and installation training
  • handles Commercial Refrigeration

Matt Werdeo

  • has Environmental Protection Agency (EPA) universal certification
  • is fusion certified for geothermal loops
  • WaterFurnace Geothermal Equipment service and install specialist

Richard Wychmann

  • is a Residental and Commercial HVAC installer
  • is fusion certified
  • is a WaterFurnace-trained installer
  • is EPA certified

Cody Thome

  • installer
  • boring machine and backhoe apprentice

Trenton Otte

  • assistant

Connie Walsdorf

  • Office Manager

Winston Polster

  • helper

John Loehr

  • service technician
  • installer

Four talented part-time employees round out our crew.

ACG, LLC | P.O. Box 255 | Kiel, WI 53042
920-894-3999 | FAX 920-894-1389

info@advancedcustomgeothermal.com

Advanced Custom Geothermal LLC BBB Business Review  2014 GEO Member LogoServing customers in the communities of Reedsville, Lomira, Plymouth, Sheboygan Falls, Hilbert, Brillion, Kewaskum, Theresa, Kohler, Kiel, Chilton, New Holstein, Appleton, Sheboygan, Howards Grove, Elkhart Lake, Fond du Lac, Manitowoc, Calumet, Sherwood, Cleveland, Valders, St. Nazianz, Fredonia, Cedar Grove, Belgium, West Bend, Cascade, Waldo, Ripon, Rosendale, Eden, Newton, School Hill, St. Cloud, Wrightstown, Kaukauna, and Kimberly and throughout the counties of Brown, Calumet, Dodge, Fond du Lac, Green Lake, Jackson, Juneau, Kewaunee, Manitowoc, Milwaukee, Outagamie, Ozaukee, Shawano, Sheboygan, Washington, Waushara and Winnebago.

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