Make ACG, Advanced Custom Geothermal, based in Kiel, Wis., your choice for geothermal.

You will get experience 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. We also install our own geothermal loops unlike many others who subcontract that work. 

Our WaterFurnace geothermal systems work well for new homes and older residences. See what our customers have to say.

Geothermal performs well for commercial buildings. We have equipped our new 2,400-square-foot facility with WaterFurnace geothermal. 

Learn more about the comfort, savings, safety and earth friendliness of systems provided by ACG, Advanced Custom Geothermal, in east-central Wisconsin. Contact ACG today.

How does geothermal work?

Here's a quick lesson in geothermal heat pump technology and a way to learn more.

Geothermal heat pump  technology does not create heat, it moves heat. A geothermal heat pump system has three main parts: a heat pump; an air or water delivery system such as ductwork or radiant floor tubing; and a heat exchanger which is a system of loops placed in the ground, a pond or well.

The heat pump is similar to your refrigerator  compressor. It uses electricity to move heat from one space to another. The ground or water outside your home then becomes either a heat source or a heat sink.

The geothermal heat pump system is recognized by the U.S. Department of Energy as a highly efficient renewable energy technology.

Need economic stimulus for your home or business?

We've got ways for you to save money.

Save on heating, cooling and hot water bills with a new WaterFurnace geothermal system installed by ACG. Use our Savings Calculator to get information tailored to your specific home or commercial building.

Save on the cost of installation of a qualified system through a healthy tax credit from the federal government.
The American Recovery and Reinvestment Act of 2009 offers a tax credit through Dec. 31, 2016. Ask your tax professional for advice.

Get cash-back rewards through Wisconsin's Focus on Energy program for efficient heating and cooling
with a qualifying geothermal system.