An American Standard EnviroWiseTM Geothermal System works on a very simple principle based on renewable energy from the sun. No matter what the weather or season, the temperature within the earth remains constant because almost half of the sun’s energy is absorbed by the Earth. By tapping into those even, steady temperatures underground, your American Standard geothermal system can comfortably heat and cool your home with great efficiency. Our geothermal systems are environmentally friendly too; with no carbon dioxide emissions, they reduce the amount of greenhouse gas emissions that contribute to climate change.