A lynchpin of the #PrincetonU plan involves innovative energy facilities based on geo-exchange. Working like a thermal “piggy bank,” a system of geo-exchange bores will be installed, removing heat from campus during the summer to reuse as a campus heat source in the winter. https://t.co/kxaDltuvCyA 6176857 A lynchpin of the #PrincetonU plan involves innovative energy facilities based on geo-exchange. Working like a thermal “piggy bank,” a system of geo-exchange bores will be installed, removing heat from campus during the summer to reuse as a campus heat source in the winter.