Geothermal heat pumps use the earth's constant temperatures for heating and cooling

A type of geothermal heat pump system
A diagram of a closed loop geothermal heat pump system

Source: U.S. Department of Energy, Office of Energy Efficiency and Renewable Energy (public domain)

Although air temperatures above ground change throughout the day and with the seasons, temperatures of the earth 10 feet below the earth's surface are consistently between 50°F and 60°F. For most areas of the United States, this means soil temperatures are usually warmer than the air in winter and cooler than the air in summer. Geothermal heat pumps use the earth's constant temperature to heat and cool buildings. Geothermal heat pumps transfer heat from the ground (or water) into buildings during the winter and reverse the process in the summer.

Geothermal heat pumps are energy efficient and cost effective

According to the U.S. Environmental Protection Agency (EPA), geothermal heat pumps are the most energy-efficient, environmentally clean, and cost-effective systems for heating and cooling buildings. All types of buildings, including homes, office buildings, schools, and hospitals, can use geothermal heat pumps.