"A new IKEA store in the Denver area will employ 500-foot-deep holes in its cooling and heating system. The 130 holes will be just below the store's parking garage. Temperatures in the holes hover around 55 degrees year round, so air inside them can be pumped up into the cooling and heating system to reduce energy costs by up to fifty percent. Nationwide, geothermal has the potential for saving billions of dollars in energy costs.