Heating costs can be astronomical during the chilly months here in the Midwest. If you want to live in a greener home, the efficiency of your heating and cooling system is the most important factor. Geothermal According to Energy Star, geothermal heating is greenest, most energy efficient way to heat your home. - A geothermal heating system is installed underneath your home and uses the earth's heat to heat your home. While geothermal systems are quite pricey upfront, they d