Save energy and money with Geothermal

The U.S. Environmental Protection Agency (EPA) said geothermal systems are, “the most energy-efficient, environmentally clean, and cost-effective space conditioning systems available today.” The Union of Concerned Scientists has said “ground-source heat pumps are the most energy-efficient and environmentally clean heating and cooling systems available.” Here are the advantages and disadvantages of owning a geothermal system for your home.


What is Geothermal?

Geothermal heat pumps (sometimes referred to as GeoExchange, earth-coupled, ground-source, or water-source heat pumps) have been in use since the late 1940s. Geothermal heat pumps (GHPs) use the constant temperature of the earth as the exchange medium instead of the outside air temperature. This allows the system to reach fairly high efficiencies (300%-600%) on the coldest of winter nights, compared to 175%-250% for air-source heat pumps on cool days.

While many parts of the country experience seasonal temperature extremes—from scorching heat in the summer to sub-zero cold in the winter—a few feet below the earth's surface the ground remains at a relatively constant temperature. Depending on latitude, ground temperatures range from 45°F (7°C) to 75°F (21°C). Like a cave, this ground temperature is warmer than the air above it during the winter and cooler than the air in the summer. The GHP takes advantage of this by exchanging heat with the earth through a ground heat exchanger.

Even though geothermal systems cost more than an air-source system of the same heating and cooling capacity, the additional costs are returned to you in energy savings in 5–10 years. There are approximately 50,000 geothermal heat pumps installed in the United States each year, and that rate is accelerating.*


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Geothermal tax credit

Federal and State income tax credits of 36% for installing eligible geothermal units ends December 31, 2016

Time is running out! Call for details!


Visit Alliant Energy for more on Geothermal and information on Utility Company rebates. 

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