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127th Wing Photos

Geothermal system under construction at Selfridge

Workers prepare to splice a “T” pipe while installing a geothermal system at Selfridge Air National Guard Base, Mich., Sept. 29, 2011. A mixture of water and Propylene glycol, an antifreeze, will run through a series of horizontal loops approximately 15 feet below ground and will be used for heating and cooling. (USAF photo by John Swanson)

PHOTO BY: John Swanson
VIRIN: 110929-F-HC784-041.JPG
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