You can claim an uncapped 30% tax credit on the total cost of a qualified geothermal system, including installation, through December 31, 2032. This is part of the Residential Clean Energy Tax Credit .
Cheaper but require significant land area for trenches 4–6 feet deep. buy geothermal heat pump
Many systems include a "desuperheater" that uses excess heat to provide virtually free domestic hot water during summer cooling. Residential Clean Energy Credit | Internal Revenue Service You can claim an uncapped 30% tax credit