Fuel-efficient… Buildings?
A contractor cuts a pipe during the installation of a new water boiler at Kunsan Air Base, Republic of Korea, Feb. 7, 2022. More than 50 buildings at the Wolf Pack are slated to have their older-style, fuel-based water heating systems, replaced with modern, more fuel-efficient, natural gas-based systems in the coming months. (U.S. Air Force photo by Staff Sgt. Steven Adkins)