Hello, i am currently living in Bloomington Indiana, but hail from the Fort Wayne. In the fort we have a new and growing company now international called  which specialize in harnessing the geothermal energy from under the ground with coils which heat and cool your home.  in the midwest the ground temperature stays between 50 to 70 degrees, by burrying these coils it is able to conduct the heat and repalce it in the ground when its not used...pleace check out this website and tell me what yall think...  www.waterfurnace.com