How does a ground source (geothermal) system work?
A ground source heat pump exchanges heat with the ground, instead of heating up or cooling down air, to maintain comfort in your home.
An electric pump circulates water mixed with ethanol (or another anti-freeze liquid) through loops of underground pipes.
This liquid transfers the earth’s heat into your home (heat source) in cold weather, and carries heat out of your home back into the ground (heat sink) in hot weather.
Ground source heat pumps are more energy efficient than an air-source heating/cooling systems because underground temperatures are constant throughout the year (55º - 57º F), compared to our extreme seasonal changes in air temperature (below zero to over 100º F).
A ground source system costs more to install than a conventional heating/cooling system, but use less energy to control home comfort, producing energy savings over the life of the system.
The Smart Energy Design Assistance Center (SEDAC)
provides advice and analyses enabling private and public facilities in the State of Illinois to increase their economic viability through the efficient use of energy resources.