Geothermal: The Energy Gem Buried In Your Yard by Mike Rampey | September 27, 2011September 27, 2011 The temperature of the earth is approximately 55 degrees across the globe below the frost line, regardless of climate. Geothermal heat pumps utilize this constant source of heat energy by transferring it from the ground […]Read More Filed Under: Geothermal– Heat Pumps Tagged With: Broken Arrow– efficient heating– energy efficiency– energy usage– geothermal heat pumps– geothermal system– ground loop– tax incentives– Tulsa