Jul. 15, 2008 - Geothermal systems operate for 1/2 to 1/4 the cost of most other heating and cooling systems! In January 2006 the U.S. Federal government changed the minimum efficiency for air conditioners to 13 SEER from the previous minimum requirement of 10 SEER. Geothermal systems are up to twice the minimum required efficiency!As efficiency ratings increase, operating costs decrease. However, efficiency ratings alone do not tell the "whole story" when it comes to operating costs for homeowners. Fuel type, home construction, geographic location and thermostat settings are just some of the factors.
