advocate sherman hospital Inspiring medicine. Changing lives.

It's more than just a lake.

It's an energy-producing, stress-reducing geothermal lake that heats and cools the hospital, saving an estimated $1 million in energy costs per year. Since this 15-acre wonder is a big deal--it's the largest geothermal system in Illinois, and one of only 2 currently heating and cooling medical centers in the US--we've answered a lot of questions about how it works below.

What is Geothermal Energy?

Geothermal energy is energy that is derived from the temperature of the earth. The earth absorbs 50 percent of all solar energy and traps it as heat just below the frost line. Using a heat pump, this natural and renewable resource trapped below the earth's surface is transformed into a harnessable form of energy. This energy --geothermal energy-- provides buildings with a dependable, eco-friendly and economic heating and cooling system.

Geothermal Energy Facts

Geothermal Lake Facts

Advocate Sherman Hospital's geothermal lake provides energy-efficient heating, cooling and ventilation, resulting in increased patient comfort and safety. The lake makes Advocate Sherman Hospital one of the most energy-efficient health care facilities in the country. It also helps Advocate Sherman Hospital to significantly reduce operating costs.

Advocate Sherman Hospital Geothermal Energy Awards