There’s a quarry’s worth of 50° water sitting beside a runway at Nashville International Airport. So airport officials decided to put that cool water to use by circulating it through the terminal’s HVAC system, then back to the quarry. The geothermal cooling system is expected to save the airport nearly half a million dollars annually, even though it cost over $10 million to build.
WPLN’s Chas Sisk reported on those plans a year ago. And just today, his colleague Blake Farmer tweeted that they’re going to switch on that new system tomorrow, just in time for summer temperatures.